Perl Script 500 Internal Server Error
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of questions I get from my visitors at thesitewizard.com, I can see that one of the most dreaded errors that newcomers to CGI face is the "500 Internal Server Error". It is one of the most uninformative error messages that can mean anything from an improper upload internal server error cgi python to a bug in the script. This article attempts to give you some concrete, practical steps that apache cgi-bin 500 internal server error you can take to narrow down the problem and hopefully eliminate it. For the uninitiated, a "500 Internal Server Error" is a message much internal server error cgi-bin apache like the common "404 File Not Found" message. You get the latter message in your browser when you try to access a non-existent web page. You get the "500 Internal Server Error" message when you try to run a script with python cgi 500 internal server error problems. For the purposes of this article, I am assuming that your CGI script is a Perl script, by far the most commonly available on the Internet. We will try to eliminate the most common errors first (and the easiest-to-eliminate ones): Location Did you upload your scripts into the right place? This is not as obvious as it may seem. Some servers are configured to run your CGI scripts anywhere. Others will only run it when it is installed in a particular directory.
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It is not just a matter of creating a "cgi-bin" directory — for example, some hosts configure the server so that it will run scripts only from a particular directory outside the web directory structure (for security reasons). Your web page will still call the script "/cgi-bin/script.pl" but the server maps it to the actual directory. You will have to upload it in the right directory, regardless of what your web page calls it. Find out such information from your web host's documentation. File Upload Mode Did you upload your Perl script in ASCII mode? Your FTP client may have uploaded the script in binary mode if you did not take any special action. Perl scripts are ASCII files, and since different operating systems have different ways of representing the end of line character (eg Unix uses a line-feed, Windows uses a carriage-return and line-feed pair), it is important that you set the uploading method to ASCII, so that line-end translation is performed. Re-upload the script, this time making sure that it was uploaded in Text or ASCII mode. Do not use any auto-detection options since the FTP program might assume the extensions you are using for your scripts are for binary files. File Permissions Did you change the permissions on your script so that it can be executed on your web server? In most cases, simply uploading the Perl script to the server does not necessarily mean that it can run. On Unix
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questions you might have Meta Discuss the workings and policies of internal server error wordpress this site About Us Learn more about Stack Overflow the company Business Learn more about hiring how to fix 500 internal server error developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is http://www.thesitewizard.com/archive/servererror.shtml a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Why does my Perl CGI script cause a 500 internal server error? up vote 3 down vote favorite I get a 500 internal server error when I try to run the http://stackoverflow.com/questions/2872040/why-does-my-perl-cgi-script-cause-a-500-internal-server-error code below in a web server which supports perl: #! /usr/bin/perl use LWP; my $ua = LWP::UserAgent->new; $ua->agent("TestApp/0.1 "); $ua->env_proxy(); my $req = HTTP::Request->new(POST => 'http://www.google.com/loc/json'); $req->content_type('application/jsonrequest'); $req->content('{ "cell_towers": [{"location_area_code": "55000", "mobile_network_code": "95", "cell_id": "20491", "mobile_country_code": "404"}], "version": "1.1.0", "request_address": "true"}'); my $res = $ua->request($req); if ($res->is_success) { print $res->content,"\n"; } else { print $res->status_line, "\n"; return undef; } But there is no error when I run the code below: #! /usr/bin/perl use CGI::Carp qw(fatalsToBrowser); print "Content-type: text/html\n\n"; print "\n"; print "
Hello World!
\n"; foreach $key (sort keys(%ENV)) { print "$key = $ENV{$key}
" ; } print "\n"; print "\n"; So I think there is some problem with my code. When I run the first perl script in my local machine with the -wc command, it says that the syntax is OK. Help me please. perl cgi share|improve this question edited May 21 '10 at 0:26 brian d foy 87.1k24150391
a web based tool that lets you track bugs in a software application (using Perl/CGI and the mySQL database). When http://www.perlmonks.org/bare/?node_id=208599 my users try to search the bugs using the Perl/CGI interface, they select their search parameters and press submit. The query either goes through cleanly with no problems at all, or they are given a 500 Internal Server Error. If they just press Refresh, the page will generate correctly 99% of the time with the correct query results. The other 1% they internal server have to press Refresh one or two more times, but it will always come back with the correct results. I've had them clear their cache numerous times and am at my wit's end. I don't know what could be causing the Internal Server Error, and why it works by just refreshing the page. This has been most frustrating for them, and moreso for internal server error me since I can't explain it. Here are the errors that I see in the error log when I get the 500 Internal Server Error: [Mon Oct 21 08:04:14 2002] [error] [client 172.26.21.54] Premature end + of script headers: /usr/local/bugzilla-2.14.1/buglist.cgi [Mon Oct 21 08:04:17 2002] [error] [client 172.26.21.54] Premature end + of script headers: /usr/local/bugzilla-2.14.1/buglist.cgi [download] As you can tell, Refresh was pressed twice for this one. :) I'm familiar with the "Premature end of script headers" error, and I've looked at the code to make sure it's always printing out the "Content-type: text/html" header with two line breaks afterwards. This is done before any printing to the screen is done. And like I said, if I refresh it usually comes back ok. Any ideas? Thanks, Trent 2002-10-28 Edit by Corion : Added code tagsComment on Perl 500 Internal Server ErrorDownload Code Replies are listed 'Best First'. Re: Perl 500 Internal Server Error by mfriedman (Monk) on Oct 28, 2002 at 22:02UTC This type of thing usually happens if the script dies unexpectedly before sending the headers. I'm not very familiar with Bugzilla, so