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-<?xml version="1.0" encoding="ISO-8859-1"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
- This file is generated from xml source: DO NOT EDIT
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- -->
-<title>Apache Tutorial: Dynamic Content with CGI - Apache HTTP Server</title>
-<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
-<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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-<body id="manual-page"><div id="page-header">
-<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
-<p class="apache">Apache HTTP Server Version 2.0</p>
-<img alt="" src="../images/feather.gif" /></div>
-<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
-<div id="path">
-<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.0</a> &gt; <a href="./">How-To / Tutorials</a></div><div id="page-content"><div id="preamble"><h1>Apache Tutorial: Dynamic Content with CGI</h1>
-<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/howto/cgi.html" title="English">&nbsp;en&nbsp;</a> |
-<a href="../ja/howto/cgi.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
-<a href="../ko/howto/cgi.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
-</div>
-</div>
-<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#intro">Introduction</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#configuring">Configuring Apache to permit CGI</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#writing">Writing a CGI program</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#troubleshoot">But it's still not working!</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#behindscenes">What's going on behind the scenes?</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#libraries">CGI modules/libraries</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#moreinfo">For more information</a></li>
-</ul></div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="intro" id="intro">Introduction</a></h2>
-
-
- <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="../mod/mod_alias.html">mod_alias</a></code></li><li><code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code></li></ul></td><td><ul><li><code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code></li><li><code class="directive"><a href="../mod/core.html#options">Options</a></code></li><li><code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code></li></ul></td></tr></table>
-
- <p>The CGI (Common Gateway Interface) defines a way for a web
- server to interact with external content-generating programs,
- which are often referred to as CGI programs or CGI scripts. It
- is the simplest, and most common, way to put dynamic content on
- your web site. This document will be an introduction to setting
- up CGI on your Apache web server, and getting started writing
- CGI programs.</p>
- </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="configuring" id="configuring">Configuring Apache to permit CGI</a></h2>
-
-
- <p>In order to get your CGI programs to work properly, you'll
- need to have Apache configured to permit CGI execution. There
- are several ways to do this.</p>
-
- <h3><a name="scriptalias" id="scriptalias">ScriptAlias</a></h3>
-
-
- <p>The
- <code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code>
-
- directive tells Apache that a particular directory is set
- aside for CGI programs. Apache will assume that every file in
- this directory is a CGI program, and will attempt to execute
- it, when that particular resource is requested by a
- client.</p>
-
- <p>The <code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code>
- directive looks like:</p>
-
- <div class="example"><p><code>
- ScriptAlias /cgi-bin/ /usr/local/apache2/cgi-bin/
- </code></p></div>
-
- <p>The example shown is from your default <code>httpd.conf</code>
- configuration file, if you installed Apache in the default
- location. The <code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code>
- directive is much like the <code class="directive"><a href="../mod/mod_alias.html#alias">Alias</a></code> directive, which defines a URL prefix that
- is to mapped to a particular directory. <code class="directive">Alias</code>
- and <code class="directive">ScriptAlias</code> are usually used for
- directories that are outside of the <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code> directory. The difference between
- <code class="directive">Alias</code> and <code class="directive">ScriptAlias</code>
- is that <code class="directive">ScriptAlias</code> has the added meaning
- that everything under that URL prefix will be considered a CGI
- program. So, the example above tells Apache that any request for a
- resource beginning with <code>/cgi-bin/</code> should be served from
- the directory <code>/usr/local/apache2/cgi-bin/</code>, and should be
- treated as a CGI program.</p>
-
- <p>For example, if the URL
- <code>http://www.example.com/cgi-bin/test.pl</code>
- is requested, Apache will attempt to execute the file
- <code>/usr/local/apache2/cgi-bin/test.pl</code>
- and return the output. Of course, the file will have to
- exist, and be executable, and return output in a particular
- way, or Apache will return an error message.</p>
-
-
- <h3><a name="nonscriptalias" id="nonscriptalias">CGI outside of ScriptAlias directories</a></h3>
-
-
- <p>CGI programs are often restricted to <code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code>'ed directories for security reasons.
- In this way, administrators can tightly control who is allowed to
- use CGI programs. However, if the proper security precautions are
- taken, there is no reason why CGI programs cannot be run from
- arbitrary directories. For example, you may wish to let users
- have web content in their home directories with the
- <code class="directive"><a href="../mod/mod_userdir.html#userdir">UserDir</a></code> directive.
- If they want to have their own CGI programs, but don't have access to
- the main <code>cgi-bin</code> directory, they will need to be able to
- run CGI programs elsewhere.</p>
-
- <p>There are two steps to allowing CGI execution in an arbitrary
- directory. First, the <code>cgi-script</code> handler must be
- activated using the <code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code> or <code class="directive"><a href="../mod/core.html#sethandler">SetHandler</a></code> directive. Second,
- <code>ExecCGI</code> must be specified in the <code class="directive"><a href="../mod/core.html#options">Options</a></code> directive.</p>
-
-
- <h3><a name="options" id="options">Explicitly using Options to permit CGI execution</a></h3>
-
-
- <p>You could explicitly use the <code class="directive"><a href="../mod/core.html#options">Options</a></code> directive, inside your main server configuration
- file, to specify that CGI execution was permitted in a particular
- directory:</p>
-
- <div class="example"><p><code>
- &lt;Directory /usr/local/apache2/htdocs/somedir&gt;<br />
- <span class="indent">
- Options +ExecCGI<br />
- </span>
- &lt;/Directory&gt;
- </code></p></div>
-
- <p>The above directive tells Apache to permit the execution
- of CGI files. You will also need to tell the server what
- files are CGI files. The following <code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code> directive tells the server to treat all
- files with the <code>cgi</code> or <code>pl</code> extension as CGI
- programs:</p>
-
- <div class="example"><p><code>
- AddHandler cgi-script .cgi .pl
- </code></p></div>
-
-
- <h3><a name="htaccess" id="htaccess">.htaccess files</a></h3>
-
-
- <p>The <a href="htaccess.html"><code>.htaccess</code> tutorial</a>
- shows how to activate CGI programs if you do not have
- access to <code>httpd.conf</code>.</p>
-
-
- <h3><a name="userdir" id="userdir">User Directories</a></h3>
-
-
- <p>To allow CGI program execution for any file ending in
- <code>.cgi</code> in users' directories, you can use the
- following configuration.</p>
-
- <div class="example"><p><code>
- &lt;Directory /home/*/public_html&gt;<br />
- <span class="indent">
- Options +ExecCGI<br />
- AddHandler cgi-script .cgi<br />
- </span>
- &lt;/Directory&gt;
- </code></p></div>
-
- <p>If you wish designate a <code>cgi-bin</code> subdirectory of
- a user's directory where everything will be treated as a CGI
- program, you can use the following.</p>
-
- <div class="example"><p><code>
- &lt;Directory /home/*/public_html/cgi-bin&gt;<br />
- <span class="indent">
- Options ExecCGI<br />
- SetHandler cgi-script<br />
- </span>
- &lt;/Directory&gt;
- </code></p></div>
-
-
-
- </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="writing" id="writing">Writing a CGI program</a></h2>
-
-
- <p>There are two main differences between ``regular''
- programming, and CGI programming.</p>
-
- <p>First, all output from your CGI program must be preceded by
- a MIME-type header. This is HTTP header that tells the client
- what sort of content it is receiving. Most of the time, this
- will look like:</p>
-
- <div class="example"><p><code>
- Content-type: text/html
- </code></p></div>
-
- <p>Secondly, your output needs to be in HTML, or some other
- format that a browser will be able to display. Most of the
- time, this will be HTML, but occasionally you might write a CGI
- program that outputs a gif image, or other non-HTML
- content.</p>
-
- <p>Apart from those two things, writing a CGI program will look
- a lot like any other program that you might write.</p>
-
- <h3><a name="firstcgi" id="firstcgi">Your first CGI program</a></h3>
-
-
- <p>The following is an example CGI program that prints one
- line to your browser. Type in the following, save it to a
- file called <code>first.pl</code>, and put it in your
- <code>cgi-bin</code> directory.</p>
-
- <div class="example"><p><code>
- #!/usr/bin/perl<br />
- print "Content-type: text/html\n\n";<br />
- print "Hello, World.";
- </code></p></div>
-
- <p>Even if you are not familiar with Perl, you should be able
- to see what is happening here. The first line tells Apache
- (or whatever shell you happen to be running under) that this
- program can be executed by feeding the file to the
- interpreter found at the location <code>/usr/bin/perl</code>.
- The second line prints the content-type declaration we
- talked about, followed by two carriage-return newline pairs.
- This puts a blank line after the header, to indicate the end
- of the HTTP headers, and the beginning of the body. The third
- line prints the string "Hello, World.". And that's the end
- of it.</p>
-
- <p>If you open your favorite browser and tell it to get the
- address</p>
-
- <div class="example"><p><code>
- http://www.example.com/cgi-bin/first.pl
- </code></p></div>
-
- <p>or wherever you put your file, you will see the one line
- <code>Hello, World.</code> appear in your browser window.
- It's not very exciting, but once you get that working, you'll
- have a good chance of getting just about anything working.</p>
-
- </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="troubleshoot" id="troubleshoot">But it's still not working!</a></h2>
-
-
- <p>There are four basic things that you may see in your browser
- when you try to access your CGI program from the web:</p>
-
- <dl>
- <dt>The output of your CGI program</dt>
- <dd>Great! That means everything worked fine. If the output is correct,
- but the browser is not processing it correctly, make sure you have the
- correct <code>Content-Type</code> set in your CGI program.</dd>
-
- <dt>The source code of your CGI program or a "POST Method Not
- Allowed" message</dt>
- <dd>That means that you have not properly configured Apache
- to process your CGI program. Reread the section on
- <a href="#configuring">configuring
- Apache</a> and try to find what you missed.</dd>
-
- <dt>A message starting with "Forbidden"</dt>
- <dd>That means that there is a permissions problem. Check the
- <a href="#errorlogs">Apache error log</a> and the section below on
- <a href="#permissions">file permissions</a>.</dd>
-
- <dt>A message saying "Internal Server Error"</dt>
- <dd>If you check the
- <a href="#errorlogs">Apache error log</a>, you will probably
- find that it says "Premature end of
- script headers", possibly along with an error message
- generated by your CGI program. In this case, you will want to
- check each of the below sections to see what might be
- preventing your CGI program from emitting the proper HTTP
- headers.</dd>
- </dl>
-
- <h3><a name="permissions" id="permissions">File permissions</a></h3>
-
-
- <p>Remember that the server does not run as you. That is,
- when the server starts up, it is running with the permissions
- of an unprivileged user - usually <code>nobody</code>, or
- <code>www</code> - and so it will need extra permissions to
- execute files that are owned by you. Usually, the way to give
- a file sufficient permissions to be executed by <code>nobody</code>
- is to give everyone execute permission on the file:</p>
-
- <div class="example"><p><code>
- chmod a+x first.pl
- </code></p></div>
-
- <p>Also, if your program reads from, or writes to, any other
- files, those files will need to have the correct permissions
- to permit this.</p>
-
-
-
- <h3><a name="pathinformation" id="pathinformation">Path information and environment</a></h3>
-
-
- <p>When you run a program from your command line, you have
- certain information that is passed to the shell without you
- thinking about it. For example, you have a <code>PATH</code>,
- which tells the shell where it can look for files that you
- reference.</p>
-
- <p>When a program runs through the web server as a CGI program,
- it may not have the same <code>PATH</code>. Any programs that you
- invoke in your CGI program (like <code>sendmail</code>, for
- example) will need to be specified by a full path, so that the
- shell can find them when it attempts to execute your CGI
- program.</p>
-
- <p>A common manifestation of this is the path to the script
- interpreter (often <code>perl</code>) indicated in the first
- line of your CGI program, which will look something like:</p>
-
- <div class="example"><p><code>
- #!/usr/bin/perl
- </code></p></div>
-
- <p>Make sure that this is in fact the path to the
- interpreter.</p>
-
- <p>In addition, if your CGI program depends on other <a href="#env">environment variables</a>, you will need to
- assure that those variables are passed by Apache.</p>
-
-
-
- <h3><a name="syntaxerrors" id="syntaxerrors">Program errors</a></h3>
-
-
- <p>Most of the time when a CGI program fails, it's because of
- a problem with the program itself. This is particularly true
- once you get the hang of this CGI stuff, and no longer make
- the above two mistakes. The first thing to do is to make
- sure that your program runs from the command line before
- testing it via the web server. For example, try:</p>
-
- <div class="example"><p><code>
- cd /usr/local/apache2/cgi-bin<br />
- ./first.pl
- </code></p></div>
-
- <p>(Do not call the <code>perl</code> interpreter. The shell
- and Apache should find the interpreter using the <a href="#pathinformation">path information</a> on the first line of
- the script.)</p>
-
- <p>The first thing you see written by your program should be
- a set of HTTP headers, including the <code>Content-Type</code>,
- followed by a blank line. If you see anything else, Apache will
- return the <code>Premature end of script headers</code> error if
- you try to run it through the server. See <a href="#writing">Writing a CGI program</a> above for more
- details.</p>
-
-
- <h3><a name="errorlogs" id="errorlogs">Error logs</a></h3>
-
-
- <p>The error logs are your friend. Anything that goes wrong
- generates message in the error log. You should always look
- there first. If the place where you are hosting your web site
- does not permit you access to the error log, you should
- probably host your site somewhere else. Learn to read the
- error logs, and you'll find that almost all of your problems
- are quickly identified, and quickly solved.</p>
-
-
- <h3><a name="suexec" id="suexec">Suexec</a></h3>
-
-
- <p>The <a href="../suexec.html">suexec</a> support program
- allows CGI programs to be run under different user permissions,
- depending on which virtual host or user home directory they are
- located in. Suexec has very strict permission checking, and any
- failure in that checking will result in your CGI programs
- failing with <code>Premature end of script headers</code>.</p>
-
- <p>To check if you are using suexec, run <code>apachectl
- -V</code> and check for the location of <code>SUEXEC_BIN</code>.
- If Apache finds an <code class="program"><a href="../programs/suexec.html">suexec</a></code> binary there on startup,
- suexec will be activated.</p>
-
- <p>Unless you fully understand suexec, you should not be using it.
- To disable suexec, simply remove (or rename) the <code class="program"><a href="../programs/suexec.html">suexec</a></code>
- binary pointed to by <code>SUEXEC_BIN</code> and then restart the
- server. If, after reading about <a href="../suexec.html">suexec</a>,
- you still wish to use it, then run <code>suexec -V</code> to find
- the location of the suexec log file, and use that log file to
- find what policy you are violating.</p>
-
- </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="behindscenes" id="behindscenes">What's going on behind the scenes?</a></h2>
-
-
- <p>As you become more advanced in CGI programming, it will
- become useful to understand more about what's happening behind
- the scenes. Specifically, how the browser and server
- communicate with one another. Because although it's all very
- well to write a program that prints "Hello, World.", it's not
- particularly useful.</p>
-
- <h3><a name="env" id="env">Environment variables</a></h3>
-
-
- <p>Environment variables are values that float around you as
- you use your computer. They are useful things like your path
- (where the computer searches for the actual file
- implementing a command when you type it), your username, your
- terminal type, and so on. For a full list of your normal,
- every day environment variables, type
- <code>env</code> at a command prompt.</p>
-
- <p>During the CGI transaction, the server and the browser
- also set environment variables, so that they can communicate
- with one another. These are things like the browser type
- (Netscape, IE, Lynx), the server type (Apache, IIS, WebSite),
- the name of the CGI program that is being run, and so on.</p>
-
- <p>These variables are available to the CGI programmer, and
- are half of the story of the client-server communication. The
- complete list of required variables is at
- <a href="http://hoohoo.ncsa.uiuc.edu/cgi/env.html">http://hoohoo.ncsa.uiuc.edu/cgi/env.html</a>.</p>
-
- <p>This simple Perl CGI program will display all of the
- environment variables that are being passed around. Two
- similar programs are included in the
- <code>cgi-bin</code>
-
- directory of the Apache distribution. Note that some
- variables are required, while others are optional, so you may
- see some variables listed that were not in the official list.
- In addition, Apache provides many different ways for you to
- <a href="../env.html">add your own environment variables</a>
- to the basic ones provided by default.</p>
-
- <div class="example"><p><code>
- #!/usr/bin/perl<br />
- print "Content-type: text/html\n\n";<br />
- foreach $key (keys %ENV) {<br />
- <span class="indent">
- print "$key --&gt; $ENV{$key}&lt;br&gt;";<br />
- </span>
- }
- </code></p></div>
-
-
- <h3><a name="stdin" id="stdin">STDIN and STDOUT</a></h3>
-
-
- <p>Other communication between the server and the client
- happens over standard input (<code>STDIN</code>) and standard
- output (<code>STDOUT</code>). In normal everyday context,
- <code>STDIN</code> means the keyboard, or a file that a
- program is given to act on, and <code>STDOUT</code>
- usually means the console or screen.</p>
-
- <p>When you <code>POST</code> a web form to a CGI program,
- the data in that form is bundled up into a special format
- and gets delivered to your CGI program over <code>STDIN</code>.
- The program then can process that data as though it was
- coming in from the keyboard, or from a file</p>
-
- <p>The "special format" is very simple. A field name and
- its value are joined together with an equals (=) sign, and
- pairs of values are joined together with an ampersand
- (&amp;). Inconvenient characters like spaces, ampersands, and
- equals signs, are converted into their hex equivalent so that
- they don't gum up the works. The whole data string might look
- something like:</p>
-
- <div class="example"><p><code>
- name=Rich%20Bowen&amp;city=Lexington&amp;state=KY&amp;sidekick=Squirrel%20Monkey
- </code></p></div>
-
- <p>You'll sometimes also see this type of string appended to
- a URL. When that is done, the server puts that string
- into the environment variable called
- <code>QUERY_STRING</code>. That's called a <code>GET</code>
- request. Your HTML form specifies whether a <code>GET</code>
- or a <code>POST</code> is used to deliver the data, by setting the
- <code>METHOD</code> attribute in the <code>FORM</code> tag.</p>
-
- <p>Your program is then responsible for splitting that string
- up into useful information. Fortunately, there are libraries
- and modules available to help you process this data, as well
- as handle other of the aspects of your CGI program.</p>
-
- </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="libraries" id="libraries">CGI modules/libraries</a></h2>
-
-
- <p>When you write CGI programs, you should consider using a
- code library, or module, to do most of the grunt work for you.
- This leads to fewer errors, and faster development.</p>
-
- <p>If you're writing CGI programs in Perl, modules are
- available on <a href="http://www.cpan.org/">CPAN</a>. The most
- popular module for this purpose is <code>CGI.pm</code>. You might
- also consider <code>CGI::Lite</code>, which implements a minimal
- set of functionality, which is all you need in most programs.</p>
-
- <p>If you're writing CGI programs in C, there are a variety of
- options. One of these is the <code>CGIC</code> library, from
- <a href="http://www.boutell.com/cgic/">http://www.boutell.com/cgic/</a>.</p>
- </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="moreinfo" id="moreinfo">For more information</a></h2>
-
-
- <p>There are a large number of CGI resources on the web. You
- can discuss CGI problems with other users on the Usenet group
- <a href="news:comp.infosystems.www.authoring.cgi">comp.infosystems.www.authoring.cgi</a>. And the -servers mailing
- list from the HTML Writers Guild is a great source of answers
- to your questions. You can find out more at
- <a href="http://www.hwg.org/lists/hwg-servers/">http://www.hwg.org/lists/hwg-servers/</a>.</p>
-
- <p>And, of course, you should probably read the CGI
- specification, which has all the details on the operation of
- CGI programs. You can find the original version at the
- <a href="http://hoohoo.ncsa.uiuc.edu/cgi/interface.html">NCSA</a> and there is an updated draft at the
- <a href="http://web.golux.com/coar/cgi/">Common Gateway
- Interface RFC project</a>.</p>
-
- <p>When you post a question about a CGI problem that you're
- having, whether to a mailing list, or to a newsgroup, make sure
- you provide enough information about what happened, what you
- expected to happen, and how what actually happened was
- different, what server you're running, what language your CGI
- program was in, and, if possible, the offending code. This will
- make finding your problem much simpler.</p>
-
- <p>Note that questions about CGI problems should <strong>never</strong>
- be posted to the Apache bug database unless you are sure you
- have found a problem in the Apache source code.</p>
- </div></div>
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