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<title>Ocamlnet 4 Reference Manual : Netcgi_apache</title>
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<h1>Module <a href="type_Netcgi_apache.html">Netcgi_apache</a></h1>
<pre><span id="MODULENetcgi_apache"><span class="keyword">module</span> Netcgi_apache</span>: <code class="code">sig</code> <a href="Netcgi_apache.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Netcgi Apache "mod" connector.</p>
<p>See the <code class="code">Netcgi_mod.setup</code> section at the end of this file to know
how to configure Apache.</p>
</div>
</div>
<hr width="100%">
<pre><span id="MODULEApache"><span class="keyword">module</span> <a href="Netcgi_apache.Apache.html">Apache</a></span>: <code class="code">sig</code> <a href="Netcgi_apache.Apache.html">..</a> <code class="code">end</code></pre><div class="info">
<p>Interface to Apache API.</p>
</div>
<pre><span id="MODULEHandler"><span class="keyword">module</span> <a href="Netcgi_apache.Handler.html">Handler</a></span>: <code class="code">sig</code> <a href="Netcgi_apache.Handler.html">..</a> <code class="code">end</code></pre><div class="info">
<p>Registering Apache handlers.</p>
</div>
<pre><span id="TYPEcgi"><span class="keyword">class type</span> <a href="Netcgi_apache.cgi-c.html">cgi</a></span> = <code class="code">object</code> <a href="Netcgi_apache.cgi-c.html">..</a> <code class="code">end</code></pre><div class="info">
<p>The usual <code class="code">cgi</code> class with an additional method to access Apache
specificities.</p>
</div>
<pre><span id="VALrun"><span class="keyword">val</span> run</span> : <code class="type">?config:<a href="Netcgi.html#TYPEconfig">Netcgi.config</a> -><br> ?output_type:<a href="Netcgi.html#TYPEoutput_type">Netcgi.output_type</a> -><br> ?arg_store:<a href="Netcgi.html#TYPEarg_store">Netcgi.arg_store</a> -><br> ?exn_handler:<a href="Netcgi.html#TYPEexn_handler">Netcgi.exn_handler</a> -> (<a href="Netcgi_apache.cgi-c.html">cgi</a> -> unit) -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">run f</code> register the function <code class="code">f</code> as a main function of the
script. Each call to the script will execute <code class="code">f cgi</code>. The code
outside <code class="code">f</code> will be executed only once (when the script is
loaded into memory) which allows to cache database connections,
etc. (The code stays in memory unless you restart the server or
the file changes on disk.)</p>
</div>
</div>
<div class="param_info"><code class="code">config</code> : Default: <a href="Netcgi.html#VALdefault_config"><code class="code">Netcgi.default_config</code></a></div>
<div class="param_info"><code class="code">output_type</code> : Default: <code class="code">`Direct ""</code></div>
<div class="param_info"><code class="code">arg_store</code> : Default: <code class="code">`Automatic</code> for all arguments.</div>
<div class="param_info"><code class="code">exn_handler</code> : See <a href="Netcgi.html#TYPEexn_handler"><code class="code">Netcgi.exn_handler</code></a>. Default: delegate
all exceptions to the default handler.</div>
<h3 id="setup">Setup</h3>
<h4 id="3_Apache13">Apache 1.3</h4>
<p>You need to put in an Apache configuration file (we recommend
/etc/apache/conf.d/netcgi_apache.conf) the following lines:</p>
<pre class="verbatim"> LoadModule netcgi_module /usr/lib/apache/1.3/mod_netcgi_apache.so
NetcgiRequire netcgi2-apache
</pre>
<h4 id="3_Apache22orlater">Apache 2.2 or later</h4>
<p>You need to put in an Apache configuration file (we recommend
/etc/apache2/mods-available/netcgi_apache.load) the following line:</p>
<pre class="verbatim"> LoadModule netcgi_module /usr/lib/apache2/modules/mod_netcgi_apache.so
NetcgiRequire netcgi2-apache
</pre><p>and make a symbolic link from /etc/apache2/mods-enabled/ to it to
actually enable it. Subsequent configuration is recommended to be
in /etc/apache2/mods-available/netcgi_apache.conf (also to be
linked to /etc/apache2/mods-enabled/).</p>
<h4 id="3_Loadinglibraries">Loading libraries</h4>
<p>If your scripts depend on other libraries, you need to load them
using <code class="code">NetcgiLoad</code>. More specifically, if your library is x.cma and
is in the subdirectory y of standard OCaml directory (given by
`ocamlc -where`), use</p>
<pre class="verbatim"> NetcgiLoad y/x.cma
</pre><p>If x.cma is not in a subdirectory of `ocamlc -where`, you need to
specify the full path.</p>
<h4 id="3_Interactionwithfindlib">Interaction with findlib</h4>
<p>Libraries managed with findlib are specially supported. In order to
load a library "lib" just use</p>
<pre class="verbatim"> NetcgiRequire lib
</pre><p>Findlib-managed libraries are automatically found.</p>
<p>For special configurations one can also set Findlib predicates:</p>
<pre class="verbatim"> NetcgiPredicates p1,p2,p3,...
</pre>
<h4 id="3_Multithreading">Multi-threading</h4>
<p>If you need multi-threading call</p>
<pre class="verbatim"> NetcgiThread
</pre><p>as the very first directive after <code class="code">LoadModule</code>, even before
<code class="code">NetcgiRequire netcgi2-apache</code> (otherwise a number of
critical sections remain unprotected in Ocamlnet, and you'll experience
crashes).</p>
<h4 id="3_Installingscripts">Installing scripts</h4>
<p>You need also to tell Apache how to detect whether a script is to
be handled by netcgi_apache, either by putting them in a special
directory (here /caml-bin/):</p>
<pre class="verbatim"> Alias /caml-bin/ /path/to/your/scripts/
<Location /caml-bin>
SetHandler ocaml-bytecode
NetcgiHandler Netcgi_apache.bytecode
Options ExecCGI
Allow from all
</Location>
</pre><p>or by distinguishing them by their extension (here <code class="code">.cma</code>):</p>
<pre class="verbatim"> NetcgiHandler Netcgi_apache.bytecode
AddHandler ocaml-bytecode .cma
</pre>
<h4 id="3_Compilingscripts">Compiling scripts</h4>
<p>If your script reside in the file <code class="code">x.ml</code>, compile it to <code class="code">x.cmo</code> or
<code class="code">x.cma</code>. If your script depends on other libraries, you may
either load them with <code class="code">NetcgiLoad</code> (see above) or include them in
<code class="code">x.cma</code>. You need not include the <code class="code">netcgi_apache.cma</code>,
<code class="code">netcgi.cma</code>, <code class="code">netstring.cma</code>, <code class="code">netsys.cma</code>, or <code class="code">pcre.cma</code> modules
as these are already loaded into Apache (see above).</p>
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