Cgi Error Logs
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POD View/Report Bugs Module Version: 1.00 Source NAME SYNOPSIS DESCRIPTION Types and Formats of Messages TIPS/TRICKS BUGS AUTHOR SEE ALSO NAME CGI::Log - Perl extension apache cgi error log for centralized logging of debug, error, status and success messages from apache log format scripts or other modules. SYNOPSIS use CGI::Log; Log->debug("user: $user"); ## add messages Log->status("Welcome $user."); Log->error("I'm sorry $user, but apache loglevel you do not have access to that area."); @msg = Log->get_debug(); ## get messages @msg = Log->get_error(); @msg = Log->get_error("UI"); @msg = Log->get_status(); Log->is_error; ## test for messages
Apache Error Log Location
Log->is_status; Log->is_success; Log->debug_off; ## causes print() and debug() to be skipped Log->print(); ## outputs debug and error logs in HTML Log->clear; ## clear all entries (current pid) Log->_report; ## reports the sizes of the arrays (lengths) Log->ui_no_error(); ## turns off inclusion of $! in user error messages DESCRIPTION This module acts as a central repository for debug, cgi::carp status and error messages. It instantiates itself automatically (if it needs to) so you can access the Log object functions from anywhere in you code including other modules/objects with a simple consistent syntax. It was written for CGI and mod_perl programming, but it could easily be used in any perl script where there is a need for centralized logging. (The only function which is CGI specific is print() since it outputs the debug and error logs with HTML formatting.) It was originally written to just hold debugging information, but it has been extended to hold information that you might want to return to the user (i.e. the user-interface). It is designed to be very painless to use. Add the following to any script or module where you want to log messages: use CGI::Log; The CGI::Log:: namespace has been aliased to Log:: in order to save a bit of typing when adding debugging messages. So, to add a debug message, enter: Log->debug("Your message here."); ## note: this is equivalent to CGI::Log->d
necessary to get feedback about the activity and performance of the server as well as any problems that may be occurring. The Apache perl cgi HTTP Server provides very comprehensive and flexible logging capabilities. This document describes how
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to configure its logging capabilities, and how to understand what the logs contain. Overview Security Warning Error Log Per-module logging Access
Cgi Scripts
Log Log Rotation Piped Logs Virtual Hosts Other Log Files See alsoComments Overview Related ModulesRelated Directivesmod_log_configmod_log_forensicmod_logiomod_cgi The Apache HTTP Server provides a variety of different mechanisms for logging everything http://search.cpan.org/~jmoore/CGI-Log-1.00/Log.pm that happens on your server, from the initial request, through the URL mapping process, to the final resolution of the connection, including any errors that may have occurred in the process. In addition to this, third-party modules may provide logging capabilities, or inject entries into the existing log files, and applications such as CGI programs, or PHP scripts, or other handlers, may send messages to the server https://httpd.apache.org/docs/2.4/logs.html error log. In this document we discuss the logging modules that are a standard part of the http server. Security Warning Anyone who can write to the directory where Apache httpd is writing a log file can almost certainly gain access to the uid that the server is started as, which is normally root. Do NOT give people write access to the directory the logs are stored in without being aware of the consequences; see the security tips document for details. In addition, log files may contain information supplied directly by the client, without escaping. Therefore, it is possible for malicious clients to insert control-characters in the log files, so care must be taken in dealing with raw logs. Error Log Related ModulesRelated DirectivescoreErrorLogErrorLogFormatLogLevel The server error log, whose name and location is set by the ErrorLog directive, is the most important log file. This is the place where Apache httpd will send diagnostic information and record any errors that it encounters in processing requests. It is the first place to look when a problem occurs with starting the server or with the operation of the server, since it will often contain details of w
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command line Testing from the Web server CGI script file permissions
Content-type headers Now let's modify hello.pl so it will run as a CGI script. Every CGI script needs to output a special header as the first thing the script outputs. This header line is checked by the Web server, then passed on to the remote user invoking the script in order to tell that user's browser what type of file to expect. Most of the time, your script is going to output an HTML file, which means you'll need to output the following header: print "Content-type: text/html\n\n"; You need to output it exactly like that, including the capital "C" and the lowercase everything else. Please note that there are two newline characters (\n\n) at the end of the header. CGI novices tend to forget that, but it's really important, since the header needs to be followed by a blank line. So, adding that line to our hello.pl script gives us the following: #!/usr/bin/perl # hello.pl -- my first perl script! print "Content-type: text/html\n\n"; print "Hello, world!\n"; Return to the top of the page Here-document quoting As long as we're claiming this is HTML that we're outputting, let's go ahead and make our output a valid HTML file: #!/usr/bin/perl # hello.pl -- my first perl script! print "Content-type: text/html\n\n"; print <<"EOF";