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  • Are all the system's floating points operations the same?

    - by Jj
    We're making this web app in PHP and when working in the reports we have Excel files to compare our results to make sure our coding is doing the right operations. Now we're running into some differences due floating point arithmetics. We're doing the same divisions and multiplications and running into slightly different numbers, that add up to a notable difference. My question is if Excel is delegating it's floating point arithmetic to the CPU and PHP is also relying in the CPU for it's operations. Or does each application implements its own set of math algorithms?

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  • Help with Apache rewriteengine rules

    - by Vinay
    Hello - I am trying to write a simple rewrite rule using the rewriteengine in apache. I want to redirect all traffic destined to a website unless the traffic originates from a specific IP address and the URI contains two specific strings. RewriteEngine On RewriteLog /var/log/apache2/rewrite_kudithipudi.log RewriteLogLevel 1 RewriteCond %{REMOTE_ADDR} ^199\.27\.130\.105 RewriteCond %{REQUEST_URI} !/StringOne [NC, OR] RewriteCond %{REQUEST_URI} !/StringTwo [NC] RewriteRule ^/(.*) http://www.google.com [R=302,L] I put these statements in my virtual host configuration. But the rewriteengine seems to be redirect all requests, whether they match the condition or not. Am I missing something? Thank you. Vinay.

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  • Linux kernel with grsec + Java / Apache Tomcat

    - by NoozNooz42
    I've got a Debian Linux 64 bit dedicated server. The kernel has the grsec patch applied. I'm mainly using this server to run Apache Tomcat (6.0.26, Java 6) and everything seems fine. The only issue, is that when I start Tomcat, I get a few of these: grsec: From xxx.xxx.xxx.xxx: Segmentation fault occurred at 00007fefe04e4000 in /home/t/jre1.6.0_20/bin/java[java:22403] uid/euid:1001/1001 gid/egid:1001/1001, parent /sbin/init[init:1] uid/euid:0/0 gid/egid:0/0 grsec: more alerts, logging disabled for 10 seconds Then no error logs anymore. Everything is fine. The kernel is: Linux 2.6.32.2-xxxx-grs-ipv4-64 #1 SMP Tue Dec 29 14:41:12 UTC 2009 x86_64 GNU/Linux And the webapp works fine. So there are segmentation fault when Tomcat starts, but everything seems to works fine. Is this concerning? Should I move to a non-grsec kernel?

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  • AJAX response not valid in C++ but Apache

    - by fehergeri
    I want to make a server written in C++ to power my game. I learned the basics of sockets and wrote a basic chat program that worked well. Now I want to create an HTTP server like Apache, but only for the AJAX request-response part. I think just for the beginning i copied one Apache response text, and i sent the exact response with the C++ server program. The problem that is that the browser (Firefox) connnects to the apache and everything works fine, except all of the requests get a correct response. But if i send this with the C++ client, then FireBug tells me that the response status is OK (200) but there is no actual response text. (How is this possible?) This response-text is exactly the same what apache sends. I made a bit-bit comparison and they were the same. The php file wich is the original response <?php echo "AS";echo rand(0,9); ?> And the origional source code: Socket.h http://pastebin.com/bW9qxtrR Socket.cpp http://pastebin.com/S3c8RFM7 main.cpp http://pastebin.com/ckExuXsR index.html http://pastebin.com/mcfEEqPP < this is the requester file. ajax.js http://pastebin.com/uXJe9hVC benchmark.js http://pastebin.com/djSYtKg9 jQuery is not needed. The main.cpp there is lot of trash code like main3 and main4 functions, these do not affect the result. I know that the response stuff in the C++ code is not really good because the connection closing is not the best; I will fix that later now I want to send a success response first. UPDATE: now i tested today a lot again and i find out there is no problem with the socket. I used the fiddler program to capture the the good answer and to capture the bad. They were the same. After this i turned off my socket application, and forced fiddler to auto respond, and the answer from the 'bad' answer still bat. So after that i replaced the bad with the good and nothing happedned. The bad answer with the good text still bad on the :8888 port but the other on the original :80 port was good, but they were absolutly the same and the same program sended it (fiddler) i think there is something missing if the response is not on the same server address (even not the same port). UPDATE: oh my god! i cant send ajax request to a remote server. now i know this.

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  • server host name and server ip address redirect (Debian, Apache)

    - by Matthias Reisner
    I have the following folder structure on my apache! .../var/www/www.x.tt/htdocs .../var/www/www.y.tt/htdocs I have defined a virtual host for each. So if I type in www.x.tt in my browser I get to the www.x.tt site. And the same for www.y.tt. But now my question! If I type in the server address or the server host name I get to the ../var/www directory but I want that the user will be redirected to the www.x.tt site! Do I have to create a new virtual host for this problem or is it also possible only to add a .htaccess Rule?! Thanks!

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  • Apache + Bind Problems

    - by Gabriel
    Hello, I am using VirtualMin on Debian-50-lenny-64-LAMP (Debian Linux 5.0). I've upgraded some packages including "bind". Since the upgrade, both Apache and Bind stopped working. Here's the errors I get: Blockquote Starting web server: apache2apache2: Could not reliably determine the server's fully qualified domain name, using 78.46.92.11 for ServerName (98)Address already in use: make_sock: could not bind to address [::]:80 (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs failed! and Failed to start BIND : Unknown error I am sure that some files were changed after the upgrade and this is a simple problems to solve, but unfortunately, it's the first time I am in this situation and I just couldn't find a solution. I've Googled about the errors but still couldn't make it work. Now I am sorry I did the update. I usually make updates to have the latest versions of the packages that are installed in the server. Any ideas?

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  • Apache 410 Gone instructions not working with mod_alias nor mod_rewrite

    - by Peter Boughton
    Apache 2.2 seems to be ignoring instructions to return a 410 status. This happens for both mod_alias's Redirect (using 410 or gone) and mod_rewrite's RewriteRule (using [G]), being used inside a .htaccess file. This works: Redirect 302 /somewhere /gone But this doesn't: Redirect 410 /somewhere That line is ignored (as if it had been commented) and the request falls through to other rules (which direct it to an unrelated generic error handling script). Similarly, trying to use a RewriteRule with a [G] flag doesn't work, but the same rule rewriting to a script that generates a 410 does - so the rules aren't the problem and it seems instead to be something about 410/gone that isn't behaving. I can workaround it by having a script sending the 410, but that's annoying and I don't get why it's not working. Any ideas?

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  • Thoughts on Apache log file sizes?

    - by Nathan Long
    Do you place any limits on the size of Apache log files - access.log and error.log? Specifically, can you give: Reasons to limit log file sizes Disk space Any other? Reasons NOT to limit log file sizes Research into performance issues or security breaches Any other? Methods of doing so Cron job that periodically deletes the file, or the first N lines? Any other? Anything you might salvage before deleting For example, grep out how many times a file was downloaded before deleting the access logs I'd like get the thoughts of experienced sysadmins before I do anything. (Marking as community wiki since this may be a matter of opinion.)

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  • Web Applications under Apache Tomcat with multiple directory contexts

    - by goran
    I have two webapps, prod-1.2.1.war and test-2.0.0.war. If I put these straight into the "tomcat/webapps"-folder, they'll get deployed as; hXXp://localhost/prod-1.2.1/ hXXp://localhost/test-2.0.0/ This works but really I would like them to show up as; hXXp://localhost/vegshop/prod/ hXXp://localhost/vegshop/test/ As you see I somehow would like the "vegshop" to be included in the context path. I also would like the version-numbering to disappear without having to rename the WAR-files. Thank you. This is Apache Tomcat v6.0 under Linux 2.6, running SUN JDK 1.6.

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  • Apache virtualhost - Mac OSX 10.7.3

    - by Rakan
    After upgrading to Lion, all my virtualhosts stopped working. They redirect to "It works" main apache page on my device for some weird reason. Example: /etc/hosts: 127.0.0.1 myhost.com <VirtualHost *:80> DocumentRoot "/Library/WebServer/Documents/testproj/" ServerName myhost.com <Directory "/Library/WebServer/Documents/testproj/"> Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny Allow from all </Directory> ErrorLog "/private/var/log/apache2/testproj-error_log" CustomLog "/private/var/log/apache2/testproj-access_log" common </VirtualHost> Did anyone else face the same issue? How can I fix this?

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  • Apache - mod_pagespeed freezes my website

    - by Jonathan Rioux
    I have installed the mod_pagepseed module for Apache. I am using Debian so I downloaded the .deb file, and installed it successfully. I then configured some filters, and it worked like a charm for some minutes. Then after something like 10 minutes, my website no longer responded to the requests. When I was requesting for my website, it said "Waiting for www.blablabla.com" and I never got the page back from the server. I checked the processes running on my Debian box with top -d 0.5, and nothing eats up the CPU. To make my website responding to requests again, I must do a /etc/init.d/apache2 restart. And then it works again with mod_modspeed applying it's filters for a couple of minutes, and no more response again. How can I diagnose this issue? Is there some other configurations in the mod_pagespeed.conf file that I must set?

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  • how can i use apache log files to recreate usage scenario

    - by daigorocub
    Recently i installed a website that had too many requests and it was too slow. Many improvements have been made to the web site code and we've also bought a new server. I want to test the new server with exactly the same requests that made the old server slow. After that, i will double the requests, make new tests and so on. These requests are logged in the apache log files. So, I can parse those files and make some kind of script to make the same requests. Of course, in this case, the requests will be made only by my computer against the server, but hey, better than nothing. Questions: - is there some app that does this already? - would you use wget? ab? python script? Thanks!

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  • apache returning "The connection was reset"

    - by usjes
    One of my dedicated servers had some network issue today and the data center has to replace some router. Since then the sites on that server returns "The connection was reset" error most of the time. I tried installing nginx and it opens better, but it still shows the error sometimes. Everything in the config seems normal, what could be causing this error? UPDATE: Just noticed that in whm apache status there are always only 1 requests currently being processed, 8 idle workers. I know for sure the server received thousands of requests per minute. What could be limiting this to such a low number?

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  • Open ports for Apache Tomcat-7.0.32 on Linux Mandriva

    - by ivanov-void
    I installed Apache Tomcat-7.0.32 on Linux Mandriva and I want to make it accessible. for this I need to open ports in iptables. I added the following rules- iptables -A INPUT -p tcp -m tcp --dport 8081 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8010 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8444 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8006 --syn -j ACCEPT then save and restart iptables - /etc/init.d/iptables save /etc/init.d/iptables restart verify, that ports is open - netstat -tulpn | less I am running command - netstat-ntpl | grep java and see - When I disable the firewall, I see the start page of the server on request - http://server_ip:8081/ When enable - server not accessible from outside. In what may be the cause? I would be most grateful for the information! Thank you!

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  • Explicitly multiplying values as longs

    - by Bill Szerdy
    I understand that all math is done as the largest data type required to handle the current values but when you transverse a loop how do you explicitly multiply longs? The following code returns 0, I suspect, because of an overflow. long result = 0L; List<Long> temp = (List<Long>) getListOfIntegers(); for (int i = 0; i < temp.size(); i++) { result *= temp.get(i).longValue(); } System.out.println(result);

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  • Webmin apache on CentOS 6.3 results in 403 forbidden, permissions are OK

    - by Mario De Schaepmeester
    First of all, I will mention that the permissions are fine for the document root directory, which is /webapps/nimbus/www/public_html The www directory contains a PHP application. PHP is a problem for later if it doesn't work, as I've tested it with a plain html file (does not work either) I just get 403 forbidden responses. The permissions are 755 on webapps and all subdirectories. I've checked other questions here and on the internet, but it was all about those permissions. Whatever info you still need, just ask, I don't know what's relevant as it's the first time ever I'm using webmin or configuring apache.

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  • What's a better choice for SQL-backed number crunching - Ruby 1.9, Python 2, Python 3, or PHP 5.3?

    - by Ivan
    Crterias of 'better': fast im math and simple (little of fields, many records) db transactions, convenient to develop/read/extend, flexible, connectible. The task is to use a common web development scripting language to process and calculate long time series and multidimensional surfaces (mostly selectint/inserting sets of floats and dong maths with rhem). The choice is Ruby 1.9, Python 2, Python 3, PHP 5.3, Perl 5.12, JavaScript (node.js). All the data is to be stored in a relational database (due to its heavily multidimensional nature), all the communication with outer world is to be done by means of web services.

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  • W3c Markup Validator on Windows 2003 with Apache

    - by rihatum
    Hi All, OS = Windows 2003 (latest sp / hotfixes etc) Perl = Active Perl 5.8.9 Build 825 Apache 2.2.11 Followed the following How-To: http://validator.w3.org/docs/install_win.html Facing the following errors : (had an html error too, but I used Perl Package manager to upgrade the required package. Now, the Package manager isn't showing any update of the following package and some others too : SGML::Parser::OpenSP version 0.991 required--this is only version 0.99 at C:/www/validator/httpd/cgi-bin/check line 61. Q : How can I download the latest package for OpenSP ? Q : Would It be just a matter of click and install the package? If someone can provide a step by step that would be very helpful, I am not fluent with building perl packages. Thanks and Regards

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  • Calculate proportional width of object (proportion: 1600x1080)

    - by Hans Stauden
    Hello, this jquery question: when I set a specific height to a "#div", i want to set the width of a inner object automatically too (cause i need a width to read it out) [ "#div" ["object"] ] example: (object).css(width: [ CALCULATION ], height: ($("#div").height())+'px' ) the original proportion of the image is: 1600x1080 here's the link to the attachment, take a look at it (tinypic): link text the heights "500px", "600px" and "700px" you can see in the attachment are just examples, the heigth could also be "711px", "623px", "998px" etc. cause the "#div" scales with the browser (i can read out the height of window, that works) my math skills aren't really good, would be great if someone could help me out :-)

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  • Obtain Latitude and Longitude from a GeoTIFF File

    - by Mikee
    Using GDAL in Python, how do you get the latitude and longitude of a GeoTIFF file? GeoTIFF's do not appear to store any coordinate information. Instead, they store the XY Origin coordinates. However, the XY coordinates do not provide the latitude and longitude of the top left corner and bottom left corner. It appears I will need to do some math to solve this problem, but I don't have a clue on where to start. What procedure is required to have this performed? I know that the GetGeoTransform() method is important for this, however, I don't know what to do with it from there.

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  • Apache will not start after IP change

    - by Doron
    I'm running CentOS 5.8 and I had to change my server's IP address. Afterwards, I'm unable start Apache. I am also running virtualmin. The error I'm receiving is: Failed to start service Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using 184.106.146.125 for ServerName (99) Cannot assign requested address: make_sock: could not bind to address 50.56.33.100:8080 no listening sockets available, shutting down Unable to open logs I edited my httpd.conf to point to the new IP address like such: #Listen 12.34.56.78:80 Listen 184.106.146.125:80 And looking at the error it still seems to be referring to the old ip address (50.*).

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  • Apache only logs PHP errors if LogLevel is set to debug

    - by Sudowned
    I'm developing a CodeIgniter application and for reasons that I do not fully understand errors have stopped being logged in the file specified in the Apache site conf. The page I'm testing is definitely generating a 500 error, but that is not reflected in the logs unless I set LogLevel debug. Setting LogLevel to error or warn results in no errors being logged. I don't think this is a CI issue because I've been developing this site for close to a week now and errors have been logged as expected until I picked the project up again this morning. Though for what it's worth, I've got: error_reporting(E_ALL); set in my index.php.

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  • How do you create a formula that has diminishing returns?

    - by egervari
    I guess this is a math question and not a programming question, but what is a good way to create a formula that has diminishing returns? Here are some example points on how I want the curve to look like. f(1) = 1 f(1.5)= .98 f(2) = .95 f(2.5) = .9 f(3) = .8 f(4) = .7 f(5) = .6 f(10) = .5 f(20) = .25 Notice that as the input gets higher, the percentage decreases rapidly. Is there any way to model a function that has a very smooth and accurate curve that says this? Another way to say it is by using a real example. You know in Diablo II they have Magic Find? There are diminishing returns for magic find. If you get 100%, the real magic find is still 100%. But the more get, your actual magic find goes down. So much that say if you had 1200, your real magic find is probably 450%. So they have a function like: actualMagicFind(magicFind) = // some way to reduced magic find

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  • Secure Apache PHP vhost configuration

    - by jsimmons
    I'm looking to secure some websites running under apache using suexec. At the moment php is executed with the user/group of the file being executed. This seems to me, not secure enough. It stops vhosts interfering with each other, but does not stop malicious code writing anywhere in the vhost being used. I was thinking that a possibility would be to run scripts as nobody/vhost group, that way the vhost user could still have full access to the vhost directories, but executing php would only be able to write to files with g+w, and to execute files with g+x. This I think should stop arbitrary writing in the web dir from compromised php. Just wondering if this is crazy, ridiculous, stupid? Of course this would be done on top of existing security measures.

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