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<link title="Ipv6" rel="Chapter" href="Ipv6.html"><title>Ocamlnet 3 Reference Manual : Nethttpd_engine.http_request_header_notification</title>
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<center><h1>Class type <a href="type_Nethttpd_engine.http_request_header_notification.html">Nethttpd_engine.http_request_header_notification</a></h1></center>
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<pre><span id="TYPEhttp_request_header_notification"><span class="keyword">class type</span> http_request_header_notification</span> = <code class="code">object</code> <a href="Nethttpd_engine.http_request_header_notification-c.html">..</a> <code class="code">end</code></pre><hr width="100%">
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<span id="2_Notificationthatanewrequestheaderhasarrived"><h2>Notification that a new request header has arrived</h2></span>
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This object notifies the user that a new request header has arrived.
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The header is accessible by the <code class="code">environment</code> object. The channels
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also contained in this object are locked at this moment. The user must
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now either call <code class="code">schedule_accept_body</code> or <code class="code">schedule_reject_body</code>. The
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user will get a second notification (a <code class="code">http_request_notification</code>, below)
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when the request body has completely arrived (in case of acceptance), or
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immediately (in case of rejection). One can also call <code class="code">schedule_finish</code>
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at any time to drop the current request.<pre><span id="METHODreq_state"><span class="keyword">method</span> req_state</span> : <code class="type"><a href="Nethttpd_engine.html#TYPEengine_req_state">engine_req_state</a></code></pre><div class="info">
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Returns the request processing state which is <code class="code">`Received_header</code> at the
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moment when this notification is delivered.<br>
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<pre><span id="METHODenvironment"><span class="keyword">method</span> environment</span> : <code class="type"><a href="Nethttpd_engine.extended_async_environment-c.html">extended_async_environment</a></code></pre><div class="info">
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The request environment. Depending on the request processing state, parts
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of the environment are already set up or still unaccessible ("locked").
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In the state <code class="code">`Received_header</code> only the request header and the
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derived fields are accessible, and the input and output channels are
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locked. In the state <code class="code">`Receiving_body</code> the input channel is unlocked,
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but it is not yet filled (reading from it may cause the exception
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<code class="code">Buffer_underrun</code>). The output channel remains locked.
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In the state <code class="code">`Received_request</code>, the input channel is unlocked and filled
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with data, and the output channel is unlocked, too.
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This environment is not fully CGI-compatible. In particular, the following
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differences exist:<ul>
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<li>There is no <code class="code">cgi_path_info</code> and no <code class="code">cgi_path_translated</code>.</li>
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<li>The user is always unauthenticated.</li>
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<li>The <code class="code">Status</code> response header works as in CGI. The <code class="code">Location</code> header, however,
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must be a full URL when set (only browser redirects)</li>
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<li>When the request body is transmitted by chunked encoding, the header
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<code class="code">Content-Length</code> is not set. In CGI this is interpreted as missing body.
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It is unlikely that clients send requests with chunked encoding, as this
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may cause interoperability problems anyway.
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<pre><span id="METHODschedule_accept_body"><span class="keyword">method</span> schedule_accept_body</span> : <code class="type">on_request:(<a href="Nethttpd_engine.http_request_notification-c.html">http_request_notification</a> -> unit) -><br> ?on_error:(unit -> unit) -> unit -> unit</code></pre><div class="info">
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Schedules that the request body is accepted. In terms of HTTP, this sends the
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"100 Continue" response when necessary. One can reply with a positive or
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This method returns immediately, and sets callbacks for certain events.
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When the body has completely arrived (or is empty), the function
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<code class="code">on_request</code> is called back. The argument is the full request notification
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When the request is dropped for some reason, <code class="code">on_error</code> is called back instead.
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This can be used to free resources, for example.
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Neither of the callbacks must raise exceptions.<br>
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<pre><span id="METHODschedule_reject_body"><span class="keyword">method</span> schedule_reject_body</span> : <code class="type">on_request:(<a href="Nethttpd_engine.http_request_notification-c.html">http_request_notification</a> -> unit) -><br> ?on_error:(unit -> unit) -> unit -> unit</code></pre><div class="info">
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Schedules that the request body is rejected. In terms of HTTP, this prevents
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sending the "100 Continue" response. Any arriving request body is silently
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discarded. One should immediately reply with an error mesage.
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This method returns immediately, and sets callbacks for certain events.
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When the body has completely arrived (or is empty), the function
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<code class="code">on_request</code> is called back. The argument is the full request notification
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When the request is dropped for some reason, <code class="code">on_error</code> is called back instead.
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This can be used to free resources, for example.
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Neither of the callbacks must raise exceptions.<br>
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<pre><span id="METHODschedule_finish"><span class="keyword">method</span> schedule_finish</span> : <code class="type">unit -> unit</code></pre><div class="info">
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Schedules that the request is finished. This method should be called after
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the regular processing of the request to ensure that the HTTP protocol
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is fulfilled. If the request body has not been
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fully read, this is now done, and its data are dropped. If the response
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is incomplete, it is completed. If the error is not recoverable, a "Server
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Error" is generated.<br>
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