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• Edit write-protected files by breaking hard links

  - by Taymon

  A directory which I own and can write to contains hard links to files that I don't own and don't have write permission for. I want to open and edit these files in Emacs. When I save my changes, Emacs should rename the existing hard link by appending ~, then write my new version of the file as a new file owned by me. I was under the impression that Emacs could just do this (because of the way it does backups), but it's not working; when I save, it attempts to change the file's permissions in order to write to it (and fails because I don't own the file). How do I make this happen?

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• Custom Response + HTTP status?

  - by Cristian Boariu

  Hi, I have a rest interface for my project. For one class i have a POST method where you can post an xml and i RETURN a custom response like: <userInvitation>Invalid email</userInvitation> if the email from the xml which was posted, was incorrect + other custom messages i have defined for different situations. For all of these the HTTP STATUS is automatically put on 200 (OK). Is there any way to change it? Ps: I know that i can throw a web application like : throw new WebApplicationException(Response.Status.BAD_REQUEST); but in this case my custom response is no more included. So i just want to return my custom error + 400 as http response. Thanks in advance.

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• Cache that always returns immediate response?

  - by Col Wilson

  I have a web service that takes a while to build a response despite being tuned as best I can. What I'd like is some sort of cache sitting in front of the service which would always return the last known value from the service, but at the same time pass the request back to the service to build an up to date response for the next request. I'm aware of the limitations that this puts on the freshness of the data, but you can assume that I'm happy to live with that. The technologies I'm using at present are python uwsgi via nginx, but that need not be a limit to any solution you might suggest. Col

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• How I can use X-editable pass value to backend and get response

  - by leonlong

  I am new to jquery, recently I tried to use X-editable to edit a table. after I edited it , I want to pass value to PHP for process, but when I want to return something else back with value, it will get an error. What I mean is usually we can get several response from PHP, but I can get it like that through this. $('#example').editable({ type: 'text', name: 'example', url: 'exprediction.php', ajaxOptions: { dataType: 'json' }, success: function(newValue) { var response = newValue.split("|"); value1 = response[0]; value2 = response[1]; //it did not work } });

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• JQuery get/ajax call executes callback without waiting for response

  - by dannyroa

  I'm having issues with my JQuery Ajax Call. The response is always null because the callback function is executed before the request to get_friends is completed. Is there anything I'm missing? Thanks in advance. $('#btn_update').click(function() { url = '/get_friends/'; $.get(url, {}, function(response){ alert(response); }); });

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• Receiving a response through UDP

  - by Neo_b

  Hello. I have seen applications send a packet through UDP to an IP on some port and receiving a response. Which port does the response go to? (Btw, how can the router know that the response is for my PC, if there are no ports forwarded to my PC?) Greetings, Neo_b

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• How does Google manage to serve results so fast?

  - by Quintin Par

  I am building an autocomplete functionality for my site and the Google instant results are my benchmark. When I look at Google, the 50-60 ms response time baffle me. They look insane. In comparison here’s how mine looks like. To give you an idea my results are cached on the load balancer and served from a machine that has httpd slowstart and initcwnd fixed. My site is also behind cloudflare From a server side perspective I don’t think I can do anything more. Can someone help me take this 500 ms response time to 60ms? What more should I be doing to achieve Google level performance?

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• Write TSQL, win a Kindle.

  - by Fatherjack

  So recently Red Gate launched sqlmonitormetrics.red-gate.com and showed the world how to embed your own scripts harmoniously in a third party tool to get the details that you want about your SQL Server performance. The site has a way to submit your own metrics and take a copy of the ones that other people have submitted to build a library of code to keep track of key metrics of your servers performance. There have been several submissions already but they have now launched a competition to provide an incentive for you to get creative and show us what you can do with a bit of TSQL and the SQL Monitor framework*. What’s it worth? Well, if you are one of the 3 winners then you get to choose either a Kindle Fire or $199. How do you win? Simply write the T-SQL for a SQL Monitor custom metric and the relevant description and introduction for it and submit it via  sqlmonitormetrics.red-gate.com before 14th Sept 2012 and then sit back and wait while the judges review your code and your aims in writing the metric. Who are the judges and how will they judge the metrics? There are two judges for this competition, Steve Jones (Microsoft SQL Server MVP, co-founder of SQLServerCentral.com, author, blogger etc) and Jonathan Allen (um, yeah, Steve has done all the good stuff, I’m here by good fortune). We will be looking to rate the metrics on each of 3 criteria: how the metric can help with performance tuning SQL Server. how having the metric running enables DBA’s to meet best practice. how interesting /original the idea for the metric is. Our combined decision will be final etc etc **  What happens to my metric? Any metrics submitted to the competition will be automatically entered into the site library and become available for sharing once the competition is over. You’ll get full credit for metrics you submit regardless of the competition results. You can enter as many metrics as you like. How long does it take? Honestly? Once you have the T-SQL sorted then so long as you can type your name and your email address you are done : http://sqlmonitormetrics.red-gate.com/share-a-metric/ What can I monitor? If you really really want a Kindle or $199 (and let’s face it, who doesn’t? ) and are momentarily stuck for inspiration, take a look at these example custom metrics that have been written by Stuart Ainsworth, Fabiano Amorim, TJay Belt, Louis Davidson, Grant Fritchey, Brad McGehee and me  to start the library off. There are some great pieces of TSQL in those metrics gathering important stats about how SQL Server is performing.   * – framework may not be the best word here but I was under pressure and couldnt think of a better one. If you prefer try ‘engine’, or ‘application’? I don’t know, pick something that makes sense to you. ** – for the full (legal) version of the rules check the details on sqlmonitormetrics.red-gate.com or send us an email if you want any point clarified. Disclaimer – Jonathan is a Friend of Red Gate and as such, whenever they are discussed, will have a generally positive disposition towards Red Gate tools. Other tools are often available and you should always try others before you come back and buy the Red Gate ones. All code in this blog is provided “as is” and no guarantee, warranty or accuracy is applicable or inferred, run the code on a test server and be sure to understand it before you run it on a server that means a lot to you or your manager.

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• How to write simple code using TDD [migrated]

  - by adeel41

  Me and my colleagues do a small TDD-Kata practice everyday for 30 minutes. For reference this is the link for the excercise http://osherove.com/tdd-kata-1/ The objective is to write better code using TDD. This is my code which I've written public class Calculator { public int Add( string numbers ) { const string commaSeparator = ","; int result = 0; if ( !String.IsNullOrEmpty( numbers ) ) result = numbers.Contains( commaSeparator ) ? AddMultipleNumbers( GetNumbers( commaSeparator, numbers ) ) : ConvertToNumber( numbers ); return result; } private int AddMultipleNumbers( IEnumerable getNumbers ) { return getNumbers.Sum(); } private IEnumerable GetNumbers( string separator, string numbers ) { var allNumbers = numbers .Replace( "\n", separator ) .Split( new string[] { separator }, StringSplitOptions.RemoveEmptyEntries ); return allNumbers.Select( ConvertToNumber ); } private int ConvertToNumber( string number ) { return Convert.ToInt32( number ); } } and the tests for this class are [TestFixture] public class CalculatorTests { private int ArrangeAct( string numbers ) { var calculator = new Calculator(); return calculator.Add( numbers ); } [Test] public void Add_WhenEmptyString_Returns0() { Assert.AreEqual( 0, ArrangeAct( String.Empty ) ); } [Test] [Sequential] public void Add_When1Number_ReturnNumber( [Values( "1", "56" )] string number, [Values( 1, 56 )] int expected ) { Assert.AreEqual( expected, ArrangeAct( number ) ); } [Test] public void Add_When2Numbers_AddThem() { Assert.AreEqual( 3, ArrangeAct( "1,2" ) ); } [Test] public void Add_WhenMoreThan2Numbers_AddThemAll() { Assert.AreEqual( 6, ArrangeAct( "1,2,3" ) ); } [Test] public void Add_SeparatorIsNewLine_AddThem() { Assert.AreEqual( 6, ArrangeAct( @"1 2,3" ) ); } } Now I'll paste code which they have written public class StringCalculator { private const char Separator = ','; public int Add( string numbers ) { const int defaultValue = 0; if ( ShouldReturnDefaultValue( numbers ) ) return defaultValue; return ConvertNumbers( numbers ); } private int ConvertNumbers( string numbers ) { var numberParts = GetNumberParts( numbers ); return numberParts.Select( ConvertSingleNumber ).Sum(); } private string[] GetNumberParts( string numbers ) { return numbers.Split( Separator ); } private int ConvertSingleNumber( string numbers ) { return Convert.ToInt32( numbers ); } private bool ShouldReturnDefaultValue( string numbers ) { return String.IsNullOrEmpty( numbers ); } } and the tests [TestFixture] public class StringCalculatorTests { [Test] public void Add_EmptyString_Returns0() { ArrangeActAndAssert( String.Empty, 0 ); } [Test] [TestCase( "1", 1 )] [TestCase( "2", 2 )] public void Add_WithOneNumber_ReturnsThatNumber( string numberText, int expected ) { ArrangeActAndAssert( numberText, expected ); } [Test] [TestCase( "1,2", 3 )] [TestCase( "3,4", 7 )] public void Add_WithTwoNumbers_ReturnsSum( string numbers, int expected ) { ArrangeActAndAssert( numbers, expected ); } [Test] public void Add_WithThreeNumbers_ReturnsSum() { ArrangeActAndAssert( "1,2,3", 6 ); } private void ArrangeActAndAssert( string numbers, int expected ) { var calculator = new StringCalculator(); var result = calculator.Add( numbers ); Assert.AreEqual( expected, result ); } } Now the question is which one is better? My point here is that we do not need so many small methods initially because StringCalculator has no sub classes and secondly the code itself is so simple that we don't need to break it up too much that it gets confusing after having so many small methods. Their point is that code should read like english and also its better if they can break it up earlier than doing refactoring later and third when they will do refactoring it would be much easier to move these methods quite easily into separate classes. My point of view against is that we never made a decision that code is difficult to understand so why we are breaking it up so early. So I need a third person's opinion to understand which option is much better.

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• Learnings from trying to write better software: Loud errors from the very start

  - by theo.spears

  Microsoft made a very small number of backwards incompatible changes between .NET 1.1 and 2.0, because they wanted to make it as easy and safe as possible to port applications to the new runtime. (Here’s a list.) However, one thing they did change was what happens when a background thread fails with an unhanded exception - in .NET 1.1 nothing happened, the thread terminated, and the application continued oblivious. Try the same trick in .NET 2.0 and the entire application, including all threads, will rudely terminate. There are three reasons for this. Firstly if a background thread has crashed, it may have left the entire application in an inconsistent state, in a way that will affect other threads. It’s better to terminate the entire application than continue and have the application perform actions based on a broken state, for example take customer orders, or write corrupt files to disk.  Secondly, during software development, it is far better for errors to be loud and obtrusive. Even if you have unit tests and integration tests (and you should), a key part of ensuring software works properly is to actually try using it, both through systematic testing and through the casual use all software gets by its developers during use. Subtle errors are easy to miss if you are not actually doing real work using the application, loud errors are obvious. Thirdly, and most importantly, even if catching and swallowing exceptions indiscriminately doesn't cause any problems in your application, the presence of unexpected exceptions shows you do not fully understand the behavior of your code. The currently released version of your application may be absolutely correct. However, because your mental model of the behavior is wrong, any future change you make to the program could and probably will introduce critical errors.  This applies to more than just exceptions causing threads to exit, any unexpected state should make the application blow up in an un-ignorable way. The worst thing you can do is silently swallow errors and continue. And let's be clear, writing to a log file does not count as blowing up in an un-ignorable way.  This is all simple as long as the call stack only contains your code, but when your functions start to be called by third party or .NET framework code, it's surprisingly easy for exceptions to start vanishing. Let's look at two examples.   1. Windows forms drag drop events  Usually if you throw an exception from a winforms event handler it will bring up the "application has crashed" dialog with abort and continue options. This is a good default behavior - the error is big and loud, but it is possible for the user to ignore the error and hopefully save their data, if somehow this bug makes it past testing. However drag and drop are different - throw an exception from one of these and it will just be silently swallowed with no explanation.  By the way, it's not just drag and drop events. Timer events do it too.  You can research how exceptions are treated in different handlers and code appropriately, but the safest and most user friendly approach is to always catch exceptions in your event handlers and show your own error message. I'll talk about one good approach to handling these exceptions at the end of this post.   2. SSMS integration for SQL Tab Magic  A while back wrote an SSMS add-in called SQL Tab Magic (learn more about the process here). It works by listening to certain SSMS events and remembering what documents are opened and closed. I deployed it internally and it was used for a few months by a number of people without problems, so I was reasonably confident in its quality. Before releasing I made a few cleanups, including introducing error reporting. Bam. A few days later I was looking at over 1,000 error reports in my inbox. In turns out I wasn't handling table designers properly. The exceptions were there, but again SSMS was helpfully swallowing them all for me, so I was blissfully unaware. Had I made my errors loud from the start, I would have noticed these issues long before and fixed them.   Handling exceptions  Now you are systematically catching exceptions throughout your application, you need to do something with them. I've tried 3 options: log them, alert the user, and automatically send them home.  There are a few good options for logging in .NET. The most widespread is Apache log4net, which provides a very capable and configurable logging framework. There is also NLog which has a compatible interface, with a greater emphasis on fluent rather than XML configuration.  Alerting the user serves two purposes. Firstly it means they understand their action has failed to they don't just assume it worked (Silent file copy failure is a problem if you then delete the originals) or that they should keep waiting for a background task to complete. Secondly, it means the users can report the bug to your support team, and then you can fix it. This means the message you show the user should contain the information you need as a developer to identify and fix it. And the user will probably just send you a screenshot of the dialog, so it shouldn't be hidden by scroll bars.  This leads us to the third option, automatically sending error reports home. By automatic I mean with minimal effort on the part of the user, rather than doing it silently behind their backs. The advantage of this is you can send back far more detailed and precise information than you can expect a user to include in an email, and by making it easier to report errors, you make it more likely users will do so.  We do this using a great tool called SmartAssembly (full disclosure: this is a product made by Red Gate). It captures complete stack traces including the values of all local variables and then allows the user to send all this information back with a single click. We also capture log files to help understand what lead up to the error. We then use the free SmartAssembly Sync for Jira to dedupe these reports and raise them as bugs in our bug tracking system.  The combined effect of loud errors during development and then automatic error reporting once software is deployed allows us to find and fix more bugs, correct misunderstandings on how our software works, and overall is a key piece in delivering higher quality software. However it is no substitute for having motivated cunning testers in the building - and we're looking to hire more of those too.   If you found this post interesting you should follow me on twitter.  

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• Is there a way to return a response every x seconds or so to a single http request?

  - by luis

  I'm wondering if it's possible to send a response every second or so to a single http request. Like for example the client makes an http request, then the server sends a space character every second. This could be never ending or with a limit, for example a minute. I think the word 'response' is misleading in this context, since I don't necessarily mean an http response. The whole http response could be composed of the space characters, which would mean a single http response to a single http request, except that it is a minute long. I tried chunked encoding but I don't think it works, or at least my implementation's wrong.

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• Download and write .tar.gz files without corruption.

  - by arbales

  I've tried numerous ways of downloading files, specifically .zip and .tar.gz, with Ruby and write them to the disk. I've found that the file appears to be the same as the reference (in size), but the archives refuse to extract. What I'm attempting now is: Thanks! def download_request(url, filePath:path, progressIndicator:progressBar) file = File.open(path, "w+") begin Net::HTTP.get_response URI.parse(url) do |response| if response['Location']!=nil puts 'Direct to: ' + response['Location'] return download_request(response['Location'], filePath:path, progressIndicator:progressBar) end # some stuff response.read_body do |segment| file.write(segment) # some progress stuff. end end ensure file.close end end download_request("http://github.com/jashkenas/coffee-script/tarball/master", filePath:"tarball.tar.gz", progressIndicator:nil)

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• Linux - Programmatically write to a proc file

  - by Zach

  I have found several examples online where we can create a proc file, assign read and write methods that are called every time the proc file is opened for read or written to. However, I can't seem to find any documentation on how to programatically write to a proc file. Ideally, I would like to add a timestamp with other user details every time the proc file is opened for read or for write. Again, I've found where I can add the read and write functions that are triggered when the proc file is opened, but I can't find documentation on how to actually write to a proc file programatically. This would be different from a regular IO read/write, correct?

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• IRP_MJ_WRITE latency up to 15 seconds

  - by racitup

  We have written an application that performs small (22kB) writes to multiple files at once (one thread performing asynchronous queued writes to multiple locations on behalf of other threads) on the same local volume (RAID1). 99.9% of the writes are low-latency but occasionally (maybe every minute or two) we get one or two huge latency writes (I have seen 10 seconds and above) without any real explanation. Platform: Win2003 Server with NTFS. Monitoring: Sysinternals Process Monitor (see link below) and our own application logging. We have tried multiple things to try and solve this that have been gleaned from a few websites, e.g.: Making the first part of file names unique to aid 8.3 name generation Writing files to multiple directories Changing Intel Disk Write Caching Windows File/Printer Sharing Minimize memory used Balance Maximize data throughput for file sharing Maximize data throughput for network applications System-Advanced-Performance-Advanced NtfsDisableLastAccessUpdate - use fsutil behavior set disablelastaccess 1 disable 8.3 name generation - use "fsutil behavior set disable8dot3 1" + restart Enable a large size file system cache Disable paging of the kernel code IO Page Lock Limit Turn Off (or On) the Indexing Service But nothing seems to make much difference. There's a whole host of things we haven't tried yet but we wondered if anyone had come across the same problem, a reason and a solution (programmatic or not)? We can reproduce the problem using IOMeter and a simple setup: Start IOMeter and remove all but the first worker thread in 'Topology' using the disconnect button. Select the Worker thread and put a cross in the box next to the disk you want to use in the Disk Targets tab and put '2000000' in Maximum Disk Size (NOTE: must have at least 1GB free space; sector size is 512 bytes) Next create a new access specification and add it to the worker thread: Transfer Request Size = 22kB 100% Sequential Percent of Access Spec = 100% Percent Read/Write = 100% Write Change Results Display Update Frequency to 5 seconds, Test Setup Run Time to 20 seconds and both 'Number of Workers to Spawn Automatically' settings to zero. Select the Worker Thread in the Topology panel and hit the Duplicate Worker button 59 times to create 60 threads with identical settings. Hit the 'Go' button (green flag) and monitor the Results tab. The 'Maximum I/O Response Time (ms)' always hits at least 3500 on our machine. Our machine isn't exactly slow (Xeon 8 core rack server with 4GB and onboard RAID). I'd be interested to see what other people get. We have a feeling it might be something to do with the NTFS filesystem (ours is currently 75% full of fragmented files) and we are going to try a few things around this principle. But it is also related to disk performance since we don't see it on a RAMDisk and it's not as severe on a RAID10 array. Any help is much appreciated. Richard Right-click and select 'Open Link in New Tab': ProcMon Result

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• Benefits of a RAID BBU in addition to a double UPS + PS system

  - by Wikser

  Today I roughly measured the benefits of enabling write-back on the RAID controller on a server at work. It got no RAID battery-backup-unit (BBU) so the write-cache is currently disabled. As the server is not used to capacity (by far), the results in most test were spectacular, e.g.: Database CRUD: before 35s, after 4s Saving a 1MB Excel file: before: 20s (!), after: 0.5s Of course having a BBU is always recommended, but what are the main benefits of installing a BBU to a system, which got redundant power supplies and is attached to UPSs? Does this depend on the type of the system (database, file, terminal)? What is a realistic fail scenario which could be prevented by a BBU? Thanks in advance!

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• writting becomes slow after few writes

  - by user1566277

  I am running an embedded Linux on arm with a SD-Card. While writing huge amounts of data I see bizarre effects. E.g, when I dd a 15 MB file few times, it writes the file (normally) in less than 2 Secs. But After lets say 3-4 times it takes sometimes 15 to 30 Seconds to write the same file. If I sync after writing the file, then this does not happen but sync takes long time too. If there is enough gap between writing two files than presumably kernel syncs itself. How can I optimize the whole performance so that write should always finish inside 2 Seconds. The File system I am using is ext3. Any pointers?

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• HttpClient POST fails to submit the form + resulting string is cut-off (incomplete)

  - by Jayomat

  Hi, I'm writing an app to check for the bus timetable's. Therefor I need to post some data to a html page, submit it, and parse the resulting page with htmlparser. Though it may be asked a lot, can some one help me identify if 1) this page does support post/get (I think it does) 2) which fields I need to use? 3) How to make the actual request? this is my code so far: String url = "http://busspur02.aseag.de/bs.exe?Cmd=RV&Karten=true&DatumT=30&DatumM=4&DatumJ=2010&ZeitH=&ZeitM=&Suchen=%28S%29uchen&GT0=&HT0=&GT1=&HT1="; String charset = "CP1252"; System.out.println("startFrom: "+start_from); System.out.println("goTo: "+destination); //String tag.v List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("HTO", start_from)); params.add(new BasicNameValuePair("HT1", destination)); params.add(new BasicNameValuePair("GTO", "Aachen")); params.add(new BasicNameValuePair("GT1", "Aachen")); params.add(new BasicNameValuePair("DatumT", day)); params.add(new BasicNameValuePair("DatumM", month)); params.add(new BasicNameValuePair("DatumJ", year)); params.add(new BasicNameValuePair("ZeitH", hour)); params.add(new BasicNameValuePair("ZeitM", min)); UrlEncodedFormEntity query = new UrlEncodedFormEntity(params, charset); HttpPost post = new HttpPost(url); post.setEntity(query); InputStream response = new DefaultHttpClient().execute(post).getEntity().getContent(); // Now do your thing with the facebook response. String source = readText(response,"CP1252"); Log.d(TAG_AVV,response.toString()); System.out.println("STREAM "+source); EDIT: This is my new code: try { HttpClient client = new DefaultHttpClient(); String getURL = "http://busspur02.aseag.de/bs.exe?SID=5FC39&ScreenX=1440&ScreenY=900&CMD=CR&Karten=true&DatumT="+day+"&DatumM="+month+"&DatumJ="+year+"&ZeitH="+hour+"&ZeitM="+min+"&Intervall=60&Suchen=(S)uchen&GT0=Aachen&T0=H&HT0="+start_from+"&GT1=Aachen&T0=H&HT1="+destination+""; HttpGet get = new HttpGet(getURL); HttpResponse responseGet = client.execute(get); HttpEntity resEntityGet = responseGet.getEntity(); if (resEntityGet != null) { //do something with the response Log.i("GET RESPONSE",EntityUtils.toString(resEntityGet)); } } catch (Exception e) { e.printStackTrace(); } But the output file is cut-off. If I do the same request in a browser I get like 14 different routes. Now the file suddenly stops and I only get 3 routes.... what's wrong? 04-30 12:19:12.362: INFO/GET RESPONSE(256): <!-- Ausgabebereich (automatisch erzeugt) --> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <div align="center"> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <p></p> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <p>Ihr Fahrplan für die Verbindung von Aachen, Kaiserplatz nach Aachen, Karlsgraben am Freitag, den 30.04.2010 (Koniginnedag), Abfahrten ab 12:19 Uhr</p> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <table class="Result"> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <th class="fussnote">Fussnote</th> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <th class="fahrzeug">Fahrzeug</th> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <th class="abfahrt">Abfahrt</th> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <th class="haltestellean">Haltestelle</th> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <th class="linie">Linie</th> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <th class="haltestelleab">Haltestelle</th> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <th class="ankunft">Ankunft</th> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <th class="fahrzeit">Fahrzeit/Tarif</th> 04-30 12:19:12.362: INFO/GET RESPONSE(256): </tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <td>&nbsp;</td><td>&nbsp;<img src="http://www.busspur.de/logos/efa-bus.gif" title="Niederflurbus"></td><td>12:23</td><td title="lc0">Aachen, Kaiserplatz [Heinrichsalle Ri. Hansemannplatz]&nbsp;<a href="http://download.avv.de/Umgebungsplaene/hlp_ac_kaiserplatz.pdf">Umgebungsplan</a></td><td>45</td><td title="lc0">Aachen, Karlsgraben&nbsp;<a href="http://download.avv.de/Umgebungsplaene/hlp_ac_karlsgraben.pdf">Umgebungsplan</a></td><td>12:34</td><td>00:11 /  1,00</td><td>&nbsp;</td> 04-30 12:19:12.362: INFO/GET RESPONSE(256): </tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <tr><td colspan="9"><a href="/bs.exe?RI=0&amp;SID=5FC39">Fahrtbegleiter</a>&nbsp;&nbsp;</td></tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <tr><td colspan="9"><hr></td></tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <td>&nbsp;</td><td>&nbsp;<img src="http://www.busspur.de/logos/efa-bus.gif" title="Niederflurbus"></td><td>12:26</td><td title="lc0">Aachen, Kaiserplatz [Heinrichsalle Ri. Hansemannplatz]&nbsp;<a href="http://download.avv.de/Umgebungsplaene/hlp_ac_kaiserplatz.pdf">Umgebungsplan</a></td><td>22</td><td title="lc0">Aachen, Karlsgraben&nbsp;<a href="http://download.avv.de/Umgebungsplaene/hlp_ac_karlsgraben.pdf">Umgebungsplan</a></td><td>12:37</td><td>00:11 /  1,00</td><td>&nbsp;</td> 04-30 12:19:12.362: INFO/GET RESPONSE(256): </tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <tr><td colspan="9"><a href="/bs.exe?RI=1&amp;SID=5FC39">Fahrtbegleiter</a>&nbsp;&nbsp;</td></tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <tr><td colspan="9"><hr></td></tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <td>&nbsp;</td><td>&nbsp;<img src="http://www.busspur.de/logos/efa-bus.gif" title="Niederflurbus"></td><td>12:28</td><td title="lc0">Aachen, Kaiserplatz [Heinrichsalle Ri. Hansemannplatz]&nbsp;<a href="http://download.avv.de/Umgebungsplaene/hlp_ac_kaiserplatz.pdf">Umgebungsplan</a></td><td>25</td><td title="lc0">Aachen, Karlsgraben&nbsp;<a href="http://download.avv.de/Umgebungsplaene/hlp_ac_karlsgraben.pdf">Umgebungsplan</a></td><td>12:39</td><td>00:11 /  1,00</td><td>&nbsp;</td> 04-30 12:19:12.362: INFO/GET RESPONSE(256): </tr> 04-30 12:19:12.362: INFO/GET RESPONSE(256): <tr><td colspan="9"><a href="/bs.exe?RI=2&amp;SID=5FC39">Fahrtbegl

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• HttpsCookieFilter - IllegalStateException: getOutputStream() has already been called for this response

  - by Mat Banik

  Following exception is thrown every once in a while and it shows up in localhost log file in tomcat log directory. If anyone know how to get rid of it, all help would be appreciated. BTW the filter is working fine I just don't know why this exception is happening. Stack trace: java.lang.IllegalStateException: getOutputStream() has already been called for this response at org.apache.catalina.connector.Response.getWriter(Response.java:611) at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198) at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112) at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:366) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:283) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:233) at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:65) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176) at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145) at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92) at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:368) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:119) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:57) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) at org.springframework.security.web.access.channel.ChannelProcessingFilter.doFilter(ChannelProcessingFilter.java:109) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:109) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380) at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:169) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) //Here is the servlet I suspect is trowing the exception. at package.HttpsCookieFilter.doFilter(HttpsCookieFilter.java:38) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:886) at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:721) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2256) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:717) The HttpsCookieFilter class: public class HttpsCookieFilter implements Filter { private static Logger log = Logger.getLogger(HttpsCookieFilter.class); @Override public void destroy() { } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { final HttpServletRequest req = (HttpServletRequest) request; final HttpServletResponse res = (HttpServletResponse) response; final HttpSession session = req.getSession(false); if (session != null) { setCookie(req, res); } try{ chain.doFilter(request, response); // <- Exception thrown from here }catch (IllegalStateException e){ log.warn("HttpsCookieFilter redirect problem! ", e); } } @Override public void init(FilterConfig arg0) throws ServletException { } private void setCookie( HttpServletRequest request, HttpServletResponse response) { Cookie cookie = new Cookie("JSESSIONID", request.getSession(false).getId()); cookie.setMaxAge(-1); cookie.setPath(getCookiePath(request)); cookie.setSecure(false); response.addCookie(cookie); } private String getCookiePath(HttpServletRequest request) { String contextPath = request.getContextPath(); return contextPath.length() > 0 ? contextPath : "/"; } } web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd"> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <listener> <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class> </listener> <listener> <listener-class>org.springframework.security.web.session.HttpSessionEventPublisher</listener-class> </listener> <filter> <filter-name>httpsCookieFilter</filter-name> <filter-class>com.iteezy.server.web.servlet.HttpsCookieFilter</filter-class> </filter> <filter-mapping> <filter-name>httpsCookieFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter> <filter-name>filterChainProxy</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> </filter> <filter-mapping> <filter-name>filterChainProxy</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> ... The reason for integrating this filter comes from Spring security FAQs: I'm using Tomcat (or some other servlet container) and have enabled HTTPS for my login page, switching back to HTTP afterwards. It doesn't work - I just end up back at the login page after authenticating. This happens because sessions created under HTTPS, for which the session cookie is marked as “secure”, cannot subsequently be used under HTTP. The browser will not send the cookie back to the server and any session state will be lost (including the security context information). Starting a session in HTTP first should work as the session cookie won't be marked as secure.

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• SSL / HTTP / No Response to Curl

  - by Alex McHale

  I am trying to send commands to a SOAP service, and getting nothing in reply. The SOAP service is at a completely separate site from either server I am testing with. I have written a dummy script with the SOAP XML embedded. When I run it at my local site, on any of three machines -- OSX, Ubuntu, or CentOS 5.3 -- it completes successfully with a good response. I then sent the script to our public host at Slicehost, where I fail to get the response back from the SOAP service. It accepts the TCP socket and proceeds with the SSL handshake. I do not however receive any valid HTTP response. This is the case whether I use my script or curl on the command line. I have rewritten the script using SOAP4R, Net::HTTP and Curb. All of which work at my local site, none of which work at the Slicehost site. I have tried to assemble the CentOS box as closely to match my Slicehost server as possible. I rebuilt the Slice to be a stock CentOS 5.3 and stock CentOS 5.4 with the same results. When I look at a tcpdump of the bad sessions on Slicehost, I see my script or curl send the XML to the remote server, and nothing comes back. When I look at the tcpdump at my local site, I see the response just fine. I have entirely disabled iptables on the Slice. Does anyone have any ideas what could be causing these results? Please let me know what additional information I can furnish. Thank you! Below is a wire trace of a sample session. The IP that starts with 173 is my server while the IP that starts with 12 is the SOAP server's. No. Time Source Destination Protocol Info 1 0.000000 173.45.x.x 12.36.x.x TCP 36872 > https [SYN] Seq=0 Win=5840 Len=0 MSS=1460 TSV=137633469 TSER=0 WS=6 Frame 1 (74 bytes on wire, 74 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 0, Len: 0 No. Time Source Destination Protocol Info 2 0.040000 12.36.x.x 173.45.x.x TCP https > 36872 [SYN, ACK] Seq=0 Ack=1 Win=8760 Len=0 MSS=1460 Frame 2 (62 bytes on wire, 62 bytes captured) Ethernet II, Src: Dell_fb:49:a1 (00:21:9b:fb:49:a1), Dst: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6) Internet Protocol, Src: 12.36.x.x (12.36.x.x), Dst: 173.45.x.x (173.45.x.x) Transmission Control Protocol, Src Port: https (443), Dst Port: 36872 (36872), Seq: 0, Ack: 1, Len: 0 No. Time Source Destination Protocol Info 3 0.040000 173.45.x.x 12.36.x.x TCP 36872 > https [ACK] Seq=1 Ack=1 Win=5840 Len=0 Frame 3 (54 bytes on wire, 54 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 1, Ack: 1, Len: 0 No. Time Source Destination Protocol Info 4 0.050000 173.45.x.x 12.36.x.x SSLv2 Client Hello Frame 4 (156 bytes on wire, 156 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 1, Ack: 1, Len: 102 Secure Socket Layer No. Time Source Destination Protocol Info 5 0.130000 12.36.x.x 173.45.x.x TCP [TCP segment of a reassembled PDU] Frame 5 (1434 bytes on wire, 1434 bytes captured) Ethernet II, Src: Dell_fb:49:a1 (00:21:9b:fb:49:a1), Dst: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6) Internet Protocol, Src: 12.36.x.x (12.36.x.x), Dst: 173.45.x.x (173.45.x.x) Transmission Control Protocol, Src Port: https (443), Dst Port: 36872 (36872), Seq: 1, Ack: 103, Len: 1380 Secure Socket Layer No. Time Source Destination Protocol Info 6 0.130000 173.45.x.x 12.36.x.x TCP 36872 > https [ACK] Seq=103 Ack=1381 Win=8280 Len=0 Frame 6 (54 bytes on wire, 54 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 103, Ack: 1381, Len: 0 No. Time Source Destination Protocol Info 7 0.130000 12.36.x.x 173.45.x.x TLSv1 Server Hello, Certificate, Server Hello Done Frame 7 (1280 bytes on wire, 1280 bytes captured) Ethernet II, Src: Dell_fb:49:a1 (00:21:9b:fb:49:a1), Dst: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6) Internet Protocol, Src: 12.36.x.x (12.36.x.x), Dst: 173.45.x.x (173.45.x.x) Transmission Control Protocol, Src Port: https (443), Dst Port: 36872 (36872), Seq: 1381, Ack: 103, Len: 1226 [Reassembled TCP Segments (2606 bytes): #5(1380), #7(1226)] Secure Socket Layer No. Time Source Destination Protocol Info 8 0.130000 173.45.x.x 12.36.x.x TCP 36872 > https [ACK] Seq=103 Ack=2607 Win=11040 Len=0 Frame 8 (54 bytes on wire, 54 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 103, Ack: 2607, Len: 0 No. Time Source Destination Protocol Info 9 0.130000 173.45.x.x 12.36.x.x TLSv1 Client Key Exchange, Change Cipher Spec, Encrypted Handshake Message Frame 9 (236 bytes on wire, 236 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 103, Ack: 2607, Len: 182 Secure Socket Layer No. Time Source Destination Protocol Info 10 0.190000 12.36.x.x 173.45.x.x TLSv1 Change Cipher Spec, Encrypted Handshake Message Frame 10 (97 bytes on wire, 97 bytes captured) Ethernet II, Src: Dell_fb:49:a1 (00:21:9b:fb:49:a1), Dst: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6) Internet Protocol, Src: 12.36.x.x (12.36.x.x), Dst: 173.45.x.x (173.45.x.x) Transmission Control Protocol, Src Port: https (443), Dst Port: 36872 (36872), Seq: 2607, Ack: 285, Len: 43 Secure Socket Layer No. Time Source Destination Protocol Info 11 0.190000 173.45.x.x 12.36.x.x TLSv1 Application Data Frame 11 (347 bytes on wire, 347 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 285, Ack: 2650, Len: 293 Secure Socket Layer No. Time Source Destination Protocol Info 12 0.190000 173.45.x.x 12.36.x.x TCP [TCP segment of a reassembled PDU] Frame 12 (1514 bytes on wire, 1514 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 578, Ack: 2650, Len: 1460 Secure Socket Layer No. Time Source Destination Protocol Info 13 0.450000 12.36.x.x 173.45.x.x TCP https > 36872 [ACK] Seq=2650 Ack=578 Win=64958 Len=0 Frame 13 (54 bytes on wire, 54 bytes captured) Ethernet II, Src: Dell_fb:49:a1 (00:21:9b:fb:49:a1), Dst: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6) Internet Protocol, Src: 12.36.x.x (12.36.x.x), Dst: 173.45.x.x (173.45.x.x) Transmission Control Protocol, Src Port: https (443), Dst Port: 36872 (36872), Seq: 2650, Ack: 578, Len: 0 No. Time Source Destination Protocol Info 14 0.450000 173.45.x.x 12.36.x.x TCP [TCP segment of a reassembled PDU] Frame 14 (206 bytes on wire, 206 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 2038, Ack: 2650, Len: 152 No. Time Source Destination Protocol Info 15 0.510000 12.36.x.x 173.45.x.x TCP [TCP Dup ACK 13#1] https > 36872 [ACK] Seq=2650 Ack=578 Win=64958 Len=0 Frame 15 (54 bytes on wire, 54 bytes captured) Ethernet II, Src: Dell_fb:49:a1 (00:21:9b:fb:49:a1), Dst: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6) Internet Protocol, Src: 12.36.x.x (12.36.x.x), Dst: 173.45.x.x (173.45.x.x) Transmission Control Protocol, Src Port: https (443), Dst Port: 36872 (36872), Seq: 2650, Ack: 578, Len: 0 No. Time Source Destination Protocol Info 16 0.850000 173.45.x.x 12.36.x.x TCP [TCP Retransmission] [TCP segment of a reassembled PDU] Frame 16 (1514 bytes on wire, 1514 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 578, Ack: 2650, Len: 1460 Secure Socket Layer No. Time Source Destination Protocol Info 17 1.650000 173.45.x.x 12.36.x.x TCP [TCP Retransmission] [TCP segment of a reassembled PDU] Frame 17 (1514 bytes on wire, 1514 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 578, Ack: 2650, Len: 1460 Secure Socket Layer No. Time Source Destination Protocol Info 18 3.250000 173.45.x.x 12.36.x.x TCP [TCP Retransmission] [TCP segment of a reassembled PDU] Frame 18 (1514 bytes on wire, 1514 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 578, Ack: 2650, Len: 1460 Secure Socket Layer No. Time Source Destination Protocol Info 19 6.450000 173.45.x.x 12.36.x.x TCP [TCP Retransmission] [TCP segment of a reassembled PDU] Frame 19 (1514 bytes on wire, 1514 bytes captured) Ethernet II, Src: 40:40:17:3a:f4:e6 (40:40:17:3a:f4:e6), Dst: Dell_fb:49:a1 (00:21:9b:fb:49:a1) Internet Protocol, Src: 173.45.x.x (173.45.x.x), Dst: 12.36.x.x (12.36.x.x) Transmission Control Protocol, Src Port: 36872 (36872), Dst Port: https (443), Seq: 578, Ack: 2650, Len: 1460 Secure Socket Layer

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• How to disable windows server 2008 timestamp response

  - by Cal

  Posted this question on stackoverflow but then got instructed to post it here: I was using Rapid7's Nexpose to scan one of our web servers (windows server 2008), and got a vulnerability for timestamp response. According to Rapid7, timestamp response shall be disabled: http://www.rapid7.com/db/vulnerabilities/generic-tcp-timestamp So far I have tried several things: Edit the registry, add a "Tcp1323Opts" key to HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters, and set it to 0. http://technet.microsoft.com/en-us/library/cc938205.aspx Use this command: netsh int tcp set global timestamps=disabled Tried powershell command: Set-netTCPsetting -SettingName InternetCustom -Timestamps disabled (got error: Set-netTCPsetting : The term 'Set-netTCPsetting' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.) None of above attempts was successful, after re-scan we still got the same alert. Rapid7 suggested using a firewall that's capable of blocking it, but we want to know if there is a setting on windows to achieve it. Is it through a specific port? If yes, what is the port number? If not, could you suggest a 3rd party firewall that is capable of blocking it? Thank you very much.

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• BlazeDS first response is VERY SLOW

  - by chibban

  Hi everyone, I have a very strange an annoying problem: I have an appliaction written in Flex 3, with BlazeDS 3.2 and Java in the backend. I'm actually using a portal (liferay) to display portlets that contain Flex movies. When I hit a refresh button on my page, all the Flex movies send a RemoteObject request to the server (using BlazeDS), which should go to java classes and invoke a method (standard BlazeDS usage I 'm guessing). I'm experiencing VERY slow response (14 minutes) on the first hit, while the following hits are much faster. I've enabled the BlazeDS logging (logging level="All") and I also have debug prints coming from my java classes. I also use the "showBusyCursor" attribute for the RemoteObject - so I can see indication of the request being sent from the flex movie. Here is what I see: I hit the refresh button Each movie invokes a RemoteObject request I see a busy sign - in all the movies I see nothing in the log - no BlazeDS prints and no Java prints Wait 14 minutes or so I see BlazeDS prints followed by Java prints I see data populating my flex movies. The really weird thing is that I have the same "application" installed in 4 different computers (on my laptop and in 3 other unix machines), 3 of these installations work well (good response times) and only 1 has the issue I'm describing. I've tried many things, but everything failed. I'd be really happy to get some advice on this. Thanks

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• Squid3 not caching simple request and response

  - by Nick Spacek

  Hi folks, I've pared down my squid.conf to try to figure this out: http_port 80 accel defaultsite=host.to.cache cache_peer ip.to.cache parent 80 0 no-query originserver acl our_sites dstdomain host.to.cache http_access allow our_sites refresh_pattern . 1 20% 4320 Requests are being proxied correctly, so that's a start. Here's a request: GET http://host.to.cache/path?some_param=true Accept: */* Accept-Charset: ISO-8859-1,utf-8 Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en Connection: keep-alive Host: host.to.cache User-Agent: myuseragent And the response: Connection: keep-alive Content-Length: 585 Content-Type: application/xml Date: Thu, 06 Jan 2011 18:33:11 GMT Via: 1.0 localhost (squid/3.0.STABLE19) X-Cache: MISS from localhost X-Cache-Lookup: MISS from localhost:80 The response has no caching-related headers, but I thought that refresh_pattern would set a default behavior for responses without caching-related headers. For my test, I wanted to cache everything for one minute at minimum. Am I missing something obvious? I did take a peek at this question: Squid isn't caching ...and ran through the page here: http://www.mnot.net/cache_docs/ briefly, but didn't see anything relevant (not to say that there isn't, I could have missed something). Thanks for any help.

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• PHP Causing Segmentation Fault & Apache Blank Response

  - by Joe

  I recently updated a Debian Lenny server to php 5.3,5 using the dotdeb source. Soon after doing so certain (but not all) sites on the server stopped responding to requests. A blank response would be returned - no headers, no content, nothing. I found this related question on stackoverflow which seems to describe something similar and used the same code the user had in their answer to see if I could replicate the issue: <?php class A { public function __construct() { new B; } } class B { public function __construct() { new A; } } new A; print 'Loaded Class A'; ?> This triggered the problem - the page returned absolutely nothing despite the original question stating this was fixed in PHP 5.5.0. No CPU block as you'd expect, no wait, just an almost instant zero response. I then ran this same code from the cli (php -f test.php) and the only output I got was 'Segmentation fault'. Tailing the kernel log I've spotted: Feb 16 07:04:06 creature kernel: [192203.269037] php[17710] general protection ip:76ef37 sp:7fff155e9bb0 error:0 in php5[400000+870000] Feb 16 08:57:31 creature kernel: [199639.699854] apache2[31136]: segfault at 7fff13a84fe0 ip 7f730514ea40 sp 7fff13a85008 error 6 in libphp5.so[7f7304ce8000+915000] All extremely odd and I'm not sure what it's pointing to/what I should do to debug this further. As I said some sites work but code such as the above definitely trigger it. Not that the sites I want to server have code like that - it's just an example. Any help is much appreciated!

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• Understanding tcptraceroute versus http response

  - by kojiro

  I'm debugging a web server that has a very high wait time before responding. The server itself is quite fast and has no load, so I strongly suspect a network problem. Basically, I make a web request: wget -O/dev/null http://hostname/ --2013-10-18 11:03:08-- http://hostname/ Resolving hostname... 10.9.211.129 Connecting to hostname|10.9.211.129|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [text/html] Saving to: ‘/dev/null’ 2013-10-18 11:04:11 (88.0 KB/s) - ‘/dev/null’ saved [13641] So you see it took about a minute to give me the page, but it does give it to me with a 200 response. So I try a tcptraceroute to see what's up: $ sudo tcptraceroute hostname 80 Password: Selected device en2, address 192.168.113.74, port 54699 for outgoing packets Tracing the path to hostname (10.9.211.129) on TCP port 80 (http), 30 hops max 1 192.168.113.1 0.842 ms 2.216 ms 2.130 ms 2 10.141.12.77 0.707 ms 0.767 ms 0.738 ms 3 10.141.12.33 1.227 ms 1.012 ms 1.120 ms 4 10.141.3.107 0.372 ms 0.305 ms 0.368 ms 5 12.112.4.41 6.688 ms 6.514 ms 6.467 ms 6 cr84.phlpa.ip.att.net (12.122.107.214) 19.892 ms 18.814 ms 15.804 ms 7 cr2.phlpa.ip.att.net (12.122.107.117) 17.554 ms 15.693 ms 16.122 ms 8 cr1.wswdc.ip.att.net (12.122.4.54) 15.838 ms 15.353 ms 15.511 ms 9 cr83.wswdc.ip.att.net (12.123.10.110) 17.451 ms 15.183 ms 16.198 ms 10 12.84.5.93 9.982 ms 9.817 ms 9.784 ms 11 12.84.5.94 14.587 ms 14.301 ms 14.238 ms 12 10.141.3.209 13.870 ms 13.845 ms 13.696 ms 13 * * * … 30 * * * I tried it again with 100 hops, just to be sure – the packets never get there. So how is it that the server does respond to requests via http, even after a minute? Shouldn't all requests just die? I'm not sure how to proceed debugging why this server is slow (as opposed to why it responds at all).

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• Force request to miss cache but still store the response

  - by Tom Marthenal

  I have a slow web app that I've placed Varnish in front of. All of the pages are static (they don't vary for a different user), but they need to be updated every 5 minutes so they contain recent data. I have a simple script (wget --mirror) that crawls the entire website every 15 minutes. Each crawl takes about 5 minutes. The point of the crawl is to update every page in the Varnish cache so that a user never has to wait for the page to generate (since all pages have been generated recently thanks to the spider). The timeline looks like this: 00:00:00: Cache flushed 00:00:00: Spider starts crawling to update cache with new pages 00:05:00: Spider finishes crawling, all pages are updated until 1:15 A request that comes in between 0:00:00 and 0:05:00 might hit a page that hasn't been updated yet, and will be forced to wait a few seconds for a response. This isn't acceptable. What I'd like to do is, perhaps using some VCL magic, always foward requests from the spider to the backend, but still store the response in the cache. This way, a user will never have to wait for a page to generate since there is no 5-minute window in which parts of the cache are empty (except perhaps at server startup). How can I do this?

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