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<title>Ocamlnet 4 Reference Manual : Netcgi.cgi</title>
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<h1>Class type <a href="type_Netcgi.cgi.html">Netcgi.cgi</a></h1>
<pre><span id="TYPEcgi"><span class="keyword">class type</span> cgi</span> = <code class="code">object</code> <a href="Netcgi.cgi-c.html">..</a> <code class="code">end</code></pre><div class="info classtype top">
<div class="info-desc">
<p>Object symbolizing a CGI-like request/response cycle.</p>
<p>This is the minimal set of services a connector must provide.
Additional methods may be defined for specific connectors.</p>
</div>
</div>
<hr width="100%">
<h4 id="3_Argumentsdatasenttothescript">Arguments -- data sent to the script</h4>
<pre><span id="METHODargument"><span class="keyword">method</span> argument</span> : <code class="type">string -> <a href="Netcgi.cgi_argument-c.html">cgi_argument</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">#argument name</code> returns the value of the argument named <code class="code">name</code>.
If the argument appears several times, only one of its
instances is used.</p>
</div>
<ul class="info-attributes">
<li><b>Raises</b> <code>Not_found</code> if no such argument exists.</li>
</ul>
</div>
<pre><span id="METHODargument_value"><span class="keyword">method</span> argument_value</span> : <code class="type">?default:string -> string -> string</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">#argument_value</code> returns the value of the argument as a
string. If the argument does not exist, the <code class="code">default</code> is
returned.</p>
</div>
</div>
<div class="param_info"><code class="code">default</code> : defaults to <code class="code">""</code>.</div>
<pre><span id="METHODargument_exists"><span class="keyword">method</span> argument_exists</span> : <code class="type">string -> bool</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">#argument_exists</code> returns <code class="code">false</code> if the named parameter is
missing and <code class="code">true</code> otherwise.</p>
</div>
</div>
<pre><span id="METHODmultiple_argument"><span class="keyword">method</span> multiple_argument</span> : <code class="type">string -> <a href="Netcgi.cgi_argument-c.html">cgi_argument</a> list</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">#multiple_argument name</code> returns all the values of the
argument named <code class="code">name</code>.</p>
</div>
</div>
<pre><span id="METHODarguments"><span class="keyword">method</span> arguments</span> : <code class="type"><a href="Netcgi.cgi_argument-c.html">cgi_argument</a> list</code></pre><div class="info ">
<div class="info-desc">
<p>The complete list of arguments.</p>
</div>
</div>
<pre><span id="METHODenvironment"><span class="keyword">method</span> environment</span> : <code class="type"><a href="Netcgi.cgi_environment-c.html">cgi_environment</a></code></pre><div class="info ">
<div class="info-desc">
<p>The environment object. This object is the "outer layer" of the
activation object that connects it with real I/O channels.</p>
</div>
</div>
<pre><span id="METHODrequest_method"><span class="keyword">method</span> request_method</span> : <code class="type">[ `DELETE | `GET | `HEAD | `POST | `PUT of <a href="Netcgi.cgi_argument-c.html">cgi_argument</a> ]</code></pre><div class="info ">
<div class="info-desc">
<p>The HTTP method used to make the request.</p>
</div>
</div>
<pre><span id="METHODfinalize"><span class="keyword">method</span> finalize</span> : <code class="type">unit -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>This method calls <code class="code">#finalize</code> for every CGI argument
(including the possible one of PUT) to ensure that all files
are deleted. It also executes all functions registered with
<code class="code">#at_exit</code>. It does not close the in/out channels, however.
This method is not registered in the garbage collector, and it
is a bad idea to do so. However, all connectors offered in
Netcgi automatically call <code class="code">#finalize</code> at the end of the
request cycle (even when its terminated by an uncaught exception
when <code class="code">#config.default_exn_handler</code> is true) so you do not have
to worry much about calling it yourself.</p>
</div>
</div>
<h4 id="3_SelfreferencingURL">Self-referencing URL</h4>
<pre><span id="METHODurl"><span class="keyword">method</span> url</span> : <code class="type">?protocol:<a href="Nethttp.html#TYPEprotocol">Nethttp.protocol</a> -><br> ?with_authority:<a href="Netcgi.html#TYPEother_url_spec">other_url_spec</a> -><br> ?with_script_name:<a href="Netcgi.html#TYPEother_url_spec">other_url_spec</a> -><br> ?with_path_info:<a href="Netcgi.html#TYPEother_url_spec">other_url_spec</a> -><br> ?with_query_string:<a href="Netcgi.html#TYPEquery_string_spec">query_string_spec</a> -> unit -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Returns the URL of the current CGI-like script. (Note that it
may differ from the actual URL that requested the script if,
for example, rewriting rules were specified in the web server
configuration.)</p>
</div>
</div>
<div class="param_info"><code class="code">protocol</code> : The URL scheme. By default, the URL scheme is
used that is described in the environment</div>
<div class="param_info"><code class="code">with_authority</code> : Whether to include authority part
(e.g. http or https) of the URL, and if yes, from which
source. Default: <code class="code">`Env</code>.</div>
<div class="param_info"><code class="code">with_script_name</code> : Whether to include the part of the URL
path identifying the CGI script, and if yes, from which
source. Default: <code class="code">`Env</code>.</div>
<div class="param_info"><code class="code">with_path_info</code> : Whether to include the rest of the URL
path exceeding the script name, and if yes, from which source.
Default: <code class="code">`Env</code>.</div>
<div class="param_info"><code class="code">with_query_string</code> : Whether to include a query string,
and if yes, which one. Only arguments with <code class="code">#store</code> being
<code class="code">`Memory</code> will be added. Default: <code class="code">`None</code>, i.e. no query
string.</div>
<h4 id="3_Outputting">Outputting</h4>
<pre><span id="METHODset_header"><span class="keyword">method</span> set_header</span> : <code class="type">?status:<a href="Nethttp.html#TYPEhttp_status">Nethttp.http_status</a> -><br> ?content_type:string -><br> ?content_length:int -><br> ?set_cookie:<a href="Nethttp.html#TYPEcookie">Nethttp.cookie</a> list -><br> ?set_cookies:<a href="Netcgi.Cookie.html#TYPEt">Cookie.t</a> list -><br> ?cache:<a href="Netcgi.html#TYPEcache_control">cache_control</a> -><br> ?filename:string -><br> ?language:string -><br> ?script_type:string -><br> ?style_type:string -> ?fields:(string * string list) list -> unit -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Sets the header (removing any previous one). When the output
channel supports transactions, it is possible to set the
header (possibly several times) until the <code class="code">#out_channel</code> is
commited for the first time or <code class="code">#env#send_output_header()</code> is
called. When there is no support for transactions, the header
must be set before the first byte of output is written.</p>
<p>If <code class="code">#set_header</code> is called a second time, it will overwrite
<i>all</i> the header fields.</p>
</div>
</div>
<div class="param_info"><code class="code">status</code> : Sets the HTTP status of the reply according to
<a href="http://www.w3.org/Protocols/rfc2616">RFC 2616</a>. Defaults to
"no status", but the server normally complements an <code class="code">`Ok</code>
status in this case.</div>
<div class="param_info"><code class="code">content_type</code> : Sets the content type.
Defaults to <code class="code">"text/html"</code>.</div>
<div class="param_info"><code class="code">content_length</code> : Sets the content length (in bytes).
Default: No such field.</div>
<div class="param_info"><code class="code">set_cookie</code> : Deprecated, use <code class="code">set_cookies</code>.</div>
<div class="param_info"><code class="code">set_cookies</code> : Sets a number of cookies. Default: <code class="code">[]</code>.
Remember that the browser may not support more than 20 cookies
per web server. You can query the cookies using <code class="code">env#cookies</code>
and <code class="code">env#cookie</code>. If you set cookies, you want to think about
an appropriate <code class="code">cache</code> setting. You may also want to add a
<a href="http://www.w3.org/P3P/">P3P</a> header (Platform for Privacy
Preferences) -- otherwise your cookies may be discarded by
some browsers.</div>
<div class="param_info"><code class="code">cache</code> : Sets the cache behavior for replies to GET
requests. The default is <code class="code">`Unspecified</code>. <b>It is strongly
recommended to specify the caching behaviour!!!</b> You are on
the safe side with <code class="code">`No_cache</code>, forcing every page to be
regenerated. If your data do not change frequently, <code class="code">`Max_age
n</code> tells the caches to store the data at most <code class="code">n</code> seconds.</div>
<div class="param_info"><code class="code">filename</code> : Sets the filename associated with the page.
This filename is taken for the "save as..." dialog. Default:
<code class="code">""</code>, i.e. no filename. Note: It is bad practice if the
filename contains problematic characters (backslash, double
quote, space), or the names of directories. It is recommended
that you set <code class="code">content_type</code> to "application/octet-stream" for
this feture to work with most browsers and, if possible, to
set <code class="code">content_length</code> because that usually improves the
download dialog.)</div>
<div class="param_info"><code class="code">script_type</code> : Sets the language of the script tag (for
HTML replies). It is recommended to use this field if there
are <code class="code">ONXXX</code> attributes containing scripts before the first
<code class="code"><SCRIPT></code> element, because you cannot specify the script
language for the <code class="code">ONXXX</code> attributes otherwise. <code class="code">script_type</code>
must be a media type, e.g. "text/javascript". Default: no
language is specified.</div>
<div class="param_info"><code class="code">style_type</code> : Sets the language of the style tag (for
HTML replies). It is recommended to use this field if there
are <code class="code">STYLE</code> attributes containing scripts before the first
<code class="code"><STYLE></code> element, because you cannot specify the style
language for the <code class="code">STYLE</code> attributes otherwise. <code class="code">style_type</code>
must be a media type, e.g. "text/css". Default: no language
is specified.</div>
<div class="param_info"><code class="code">fields</code> : Sets additional fields of the header. Default: <code class="code">[]</code>.</div>
<pre><span id="METHODset_redirection_header"><span class="keyword">method</span> set_redirection_header</span> : <code class="type">?set_cookies:<a href="Netcgi.Cookie.html#TYPEt">Cookie.t</a> list -><br> ?fields:(string * string list) list -> string -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Sets the header such that a redirection to the specified URL
is performed. If the URL begins with "http:" the redirection
directive is passed back to the client, and the client will
repeat the request for the new location (with a GET method).
If the URL begins with "/", the server performs the
redirection, and it is invisible for the client.</p>
</div>
</div>
<pre><span id="METHODoutput"><span class="keyword">method</span> output</span> : <code class="type"><a href="Netchannels.trans_out_obj_channel-c.html">Netchannels.trans_out_obj_channel</a></code></pre><div class="info ">
<div class="info-deprecated">
<span class="warning">Deprecated.</span>Use <code class="code">#out_channel</code> instead.</div>
</div>
<pre><span id="METHODout_channel"><span class="keyword">method</span> out_channel</span> : <code class="type"><a href="Netchannels.trans_out_obj_channel-c.html">Netchannels.trans_out_obj_channel</a></code></pre><div class="info ">
<div class="info-desc">
<p>The output channel to which the generated content is intended
to be written. The header is not stored in this channel, so
<code class="code">#pos_out</code> returns the size of the DATA in bytes (useful to
set Content-Length). Note that HEAD requests must not send
back a message body so, in this case, all data sent to this
channel is discarded. This allows your scripts to work
unmodified for GET, POST and HEAD requests.</p>
<p>The output channel may have transactional semantics, and
because of this, it is an <code class="code">trans_out_obj_channel</code>.
Implementations are free to support transactions or not.</p>
<p>After all data have been written, the method <code class="code">#commit_work()</code>
<b>must</b> be called, even if there is no support for
transactions.</p>
<p>Simple Example:</p>
<pre class="codepre"><code class="code"> cgi # out_channel # output_string "Hello world!\n";
cgi # out_channel # commit_work()
</code></pre>
<p>Example for an error handler and a transaction buffer: If an
error happens, it is possible to roll the channel back, and to
write the error message.</p>
<pre class="codepre"><code class="code"> try
cgi # set_header ... ();
cgi # out_channel # output_string "Hello World!"; ...
cgi # out_channel # commit_work();
with err ->
cgi # out_channel # rollback_work();
cgi # set_header ... ();
cgi # out_channel # output_string "Software error!"; ...
cgi # out_channel # commit_work();
</code></pre></div>
</div>
<pre><span id="METHODat_exit"><span class="keyword">method</span> at_exit</span> : <code class="type">(unit -> unit) -> unit</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">#at_exit f</code> registers the function <code class="code">f</code> to be executed when
<code class="code">#finalize</code> is called (which is done automatically when the
request finishes). The functions are executed in the reverse
order in which they were registered.</p>
</div>
</div>
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