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rel="Section" href="#3_Argumentsdatasenttothescript"> <link title="Self-referencing URL" rel="Section" href="#3_SelfreferencingURL"> <link title="Outputting" rel="Section" href="#3_Outputting"> <title>Ocamlnet 2 Reference Manual : Netcgi.cgi</title> </head> <body> <div class="navbar"><a href="Netcgi.cgi_environment.html">Previous</a> <a href="Netcgi.html">Up</a> <a href="Netcgi.cgi_activation.html">Next</a> </div> <center><h1>Class type <a href="type_Netcgi.cgi.html">Netcgi.cgi</a></h1></center> <br> <pre><span class="keyword">class type</span> <a name="TYPEcgi"></a>cgi = <code class="code">object</code> <a href="Netcgi.cgi.html">..</a> <code class="code">end</code></pre>Object symbolizing a CGI-like request/response cycle. <p> This is the minimal set of services a connector must provide. Additional methods may be defined for specific connectors.<br> <hr width="100%"> <a name="3_Argumentsdatasenttothescript"></a> <h3>Arguments -- data sent to the script</h3><pre><span class="keyword">method</span> <a name="METHODargument"></a>argument : <code class="type">string -> <a href="Netcgi.cgi_argument.html">cgi_argument</a></code></pre><div class="info"> <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.<br> <b>Raises</b> <code>Not_found</code> if no such argument exists.<br> </div> <pre><span class="keyword">method</span> <a name="METHODargument_value"></a>argument_value : <code class="type">?default:string -> string -> string</code></pre><div class="info"> <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.<br> </div> <div class="param_info"><code class="code">default</code> : defaults to <code class="code">""</code>.</div> <pre><span class="keyword">method</span> <a name="METHODargument_exists"></a>argument_exists : <code class="type">string -> bool</code></pre><div class="info"> <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.<br> </div> <pre><span class="keyword">method</span> <a name="METHODmultiple_argument"></a>multiple_argument : <code class="type">string -> <a href="Netcgi.cgi_argument.html">cgi_argument</a> list</code></pre><div class="info"> <code class="code">#multiple_argument name</code> returns all the values of the argument named <code class="code">name</code>.<br> </div> <pre><span class="keyword">method</span> <a name="METHODarguments"></a>arguments : <code class="type"><a href="Netcgi.cgi_argument.html">cgi_argument</a> list</code></pre><div class="info"> The complete list of arguments.<br> </div> <pre><span class="keyword">method</span> <a name="METHODenvironment"></a>environment : <code class="type"><a href="Netcgi.cgi_environment.html">cgi_environment</a></code></pre><div class="info"> The environment object. This object is the "outer layer" of the activation object that connects it with real I/O channels.<br> </div> <pre><span class="keyword">method</span> <a name="METHODrequest_method"></a>request_method : <code class="type">[ `DELETE | `GET | `HEAD | `POST | `PUT of <a href="Netcgi.cgi_argument.html">cgi_argument</a> ]</code></pre><div class="info"> The HTTP method used to make the request.<br> </div> <pre><span class="keyword">method</span> <a name="METHODfinalize"></a>finalize : <code class="type">unit -> unit</code></pre><div class="info"> 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.<br> </div> <a name="3_SelfreferencingURL"></a> <h3>Self-referencing URL</h3><pre><span class="keyword">method</span> <a name="METHODurl"></a>url : <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"> 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.)<br> </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> <a name="3_Outputting"></a> <h3>Outputting</h3><pre><span class="keyword">method</span> <a name="METHODset_header"></a>set_header : <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"> 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> If <code class="code">#set_header</code> is called a second time, it will overwrite <i>all</i> the header fields.<br> </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 class="keyword">method</span> <a name="METHODset_redirection_header"></a>set_redirection_header : <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"> 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.<br> </div> <pre><span class="keyword">method</span> <a name="METHODoutput"></a>output : <code class="type"><a href="Netchannels.trans_out_obj_channel.html">Netchannels.trans_out_obj_channel</a></code></pre><div class="info"> <span class="warning">Deprecated.</span>Use <code class="code">#out_channel</code> instead.<br> </div> <pre><span class="keyword">method</span> <a name="METHODout_channel"></a>out_channel : <code class="type"><a href="Netchannels.trans_out_obj_channel.html">Netchannels.trans_out_obj_channel</a></code></pre><div class="info"> 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> 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> 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> Simple Example: <pre><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. <pre><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><br> </div> <pre><span class="keyword">method</span> <a name="METHODat_exit"></a>at_exit : <code class="type">(unit -> unit) -> unit</code></pre><div class="info"> <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.<br> </div> </body></html>