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<link title="Netsmtp" rel="Chapter" href="Netsmtp.html"><title>Ocamlnet 2 Reference Manual : Nethttpd_kernel</title>
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<center><h1>Module <a href="type_Nethttpd_kernel.html">Nethttpd_kernel</a></h1></center>
<br>
<pre><span class="keyword">module</span> Nethttpd_kernel: <code class="code">sig</code> <a href="Nethttpd_kernel.html">..</a> <code class="code">end</code></pre><a name="1_TheprotocolkerneloftheHTTPdaemon"></a>
<h1>The protocol kernel of the HTTP daemon</h1>
<p>
This module mainly defines the <code class="code">http_protocol</code> class which implements the
exchange of messages with a HTTP client. The request messages are represented
as sequence of <code class="code">req_token</code> values. The response is encapsulated in a separate
<code class="code">http_response</code> class. The contents of the response are represented as sequence
of <code class="code">resp_token</code> values.<br>
<hr width="100%">
<pre><span class="keyword">type</span> <a name="TYPEfatal_error"></a><code class="type"></code>fatal_error = <code class="type">[ `Broken_pipe<br> | `Message_too_long<br> | `Server_error<br> | `Timeout<br> | `Unix_error of Unix.error ]</code> </pre>
<div class="info">
These are the serious protocol violations after that the daemon stops
any further processing.
<p>
Note that <code class="code">`Timeout</code> refers to a timeout in the middle of a request.
<p>
Long messages are fatal because it is suspected that they are denial
of service attacks. The kernel generates <code class="code">`Message_too_long</code> only for
long headers, not for long bodies.
<p>
Fatal server errors can happen when exceptions are not properly handled.
As last resort the HTTP daemon closes the connection without notifying
the client.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALstring_of_fatal_error"></a>string_of_fatal_error : <code class="type"><a href="Nethttpd_kernel.html#TYPEfatal_error">fatal_error</a> -> string</code></pre><div class="info">
Convert error to a string, for logging<br>
</div>
<pre><span class="keyword">type</span> <a name="TYPEbad_request_error"></a><code class="type"></code>bad_request_error = <code class="type">[ `Bad_header<br> | `Bad_header_field of string<br> | `Bad_request_line<br> | `Bad_trailer<br> | `Format_error of string<br> | `Protocol_not_supported<br> | `Request_line_too_long<br> | `Unexpected_eof ]</code> </pre>
<div class="info">
A bad request is a violation where the current request cannot be
decoded, and it is not possible to accept further requests over the
current connection.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALstring_of_bad_request_error"></a>string_of_bad_request_error : <code class="type"><a href="Nethttpd_kernel.html#TYPEbad_request_error">bad_request_error</a> -> string</code></pre><div class="info">
Convert error to a string, for logging<br>
</div>
<pre><span class="keyword">val</span> <a name="VALstatus_of_bad_request_error"></a>status_of_bad_request_error : <code class="type"><a href="Nethttpd_kernel.html#TYPEbad_request_error">bad_request_error</a> -> <a href="Nethttp.html#TYPEhttp_status">Nethttp.http_status</a></code></pre><div class="info">
Returns the best response code for the error<br>
</div>
<pre><span class="keyword">type</span> <a name="TYPEdata_chunk"></a><code class="type"></code>data_chunk = <code class="type">string * int * int</code> </pre>
<div class="info">
A <code class="code">data_chunk</code> is a substring of a string. The substring is described by
the triple <code class="code">(s, pos, len)</code> where <code class="code">s</code> is the container, <code class="code">pos</code> is the
position where the substring begins, and <code class="code">len</code> its length.<br>
</div>
<pre><span class="keyword">type</span> <a name="TYPEstatus_line"></a><code class="type"></code>status_line = <code class="type">int * string</code> </pre>
<div class="info">
= (code, phrase)<br>
</div>
<pre><span class="keyword">type</span> <a name="TYPEtransfer_coding"></a><code class="type"></code>transfer_coding = <code class="type">[ `Chunked | `Identity ]</code> </pre>
<pre><span class="keyword">type</span> <a name="TYPEresp_token"></a><code class="type"></code>resp_token = <code class="type">[ `Resp_action of unit -> unit<br> | `Resp_body of <a href="Nethttpd_kernel.html#TYPEdata_chunk">data_chunk</a><br> | `Resp_end<br> | `Resp_header of <a href="Nethttp.http_header.html">Nethttp.http_header</a><br> | `Resp_info_line of <a href="Nethttpd_kernel.html#TYPEstatus_line">status_line</a> * <a href="Nethttp.http_header.html">Nethttp.http_header</a><br> | `Resp_status_line of <a href="Nethttpd_kernel.html#TYPEstatus_line">status_line</a><br> | `Resp_trailer of <a href="Nethttp.http_trailer.html">Nethttp.http_trailer</a> ]</code> </pre>
<div class="info">
The <code class="code">resp_token</code> represents a textual part of the response to send:<ul>
<li><code class="code">`Resp_info_line</code> is an informational status line (code=100..199). There can
be several informational lines, and they can be accompanied with their own
headers. Such lines are only sent to HTTP/1.1 clients.</li>
<li><code class="code">`Resp_status_line</code> is the final status line to send (code >= 200)</li>
<li><code class="code">`Resp_header</code> is the whole response header to send</li>
<li><code class="code">`Resp_body</code> is the next part of the response body to send.</li>
<li><code class="code">`Resp_trailer</code> is the whole response trailer to send (currently ignored)</li>
<li><code class="code">`Resp_action</code> is special because it does not directly represent a token
to send. The argument is a function which is called when the token is
the next token on the active event queue. The function is also called when
the event queue is dropped because of an error (the state of the
response object indicates this). The function must not raise exceptions
except <code class="code">Unix_error</code>, and it must not block.</li>
</ul>
<br>
</div>
<pre><span class="keyword">val</span> <a name="VALresp_100_continue"></a>resp_100_continue : <code class="type"><a href="Nethttpd_kernel.html#TYPEresp_token">resp_token</a></code></pre><div class="info">
The predefined token for the "100 Continue" response<br>
</div>
<pre><span class="keyword">type</span> <a name="TYPEresp_state"></a><code class="type"></code>resp_state = <code class="type">[ `Active | `Dropped | `Error | `Inhibited | `Processed | `Queued ]</code> </pre>
<div class="info">
The response state:<ul>
<li><code class="code">`Inhibited</code> = it is not yet allowed to start the response</li>
<li><code class="code">`Queued</code> = the response waits on the queue for activation</li>
<li><code class="code">`Active</code> = the response is currently being transmitted</li>
<li><code class="code">`Processed</code> = the response has been completely sent</li>
<li><code class="code">`Error</code> = an error occurred during the transmission of this response</li>
<li><code class="code">`Dropped</code> = an earlier response forced to close the connection, and
this response is dequeued</li>
</ul>
<br>
</div>
<pre><span class="keyword">type</span> <a name="TYPEfront_token"></a><code class="type"></code>front_token = <code class="type">[ `Resp_end | `Resp_wire_data of <a href="Nethttpd_kernel.html#TYPEdata_chunk">data_chunk</a> ]</code> </pre>
<div class="info">
Tokens generated by <code class="code">http_response</code>:<ul>
<li><code class="code">`Resp_wire_data</code> are data tokens.</li>
<li><code class="code">`Resp_end</code> indicates the end of the response.</li>
</ul>
<br>
</div>
<pre><span class="keyword">exception</span> <a name="EXCEPTIONSend_queue_empty"></a>Send_queue_empty</pre>
<pre><span class="keyword">type</span> <a name="TYPEannouncement"></a><code class="type"></code>announcement = <code class="type">[ `As of string | `Ignore | `Ocamlnet | `Ocamlnet_and of string ]</code> </pre>
<div class="info">
See config<br>
</div>
<pre><span class="keyword">class type</span> <a name="TYPEhttp_response"></a><a href="Nethttpd_kernel.http_response.html">http_response</a> = <code class="code">object</code> <a href="Nethttpd_kernel.http_response.html">..</a> <code class="code">end</code></pre><div class="info">
Encapsultation of the HTTP response for a single request
</div>
<pre><span class="keyword">class</span> <a name="TYPEhttp_response_impl"></a><a href="Nethttpd_kernel.http_response_impl.html">http_response_impl</a> : <code class="type">?close:bool -> ?suppress_body:bool -> <a href="Nethttp.html#TYPEprotocol">Nethttp.protocol</a> -> <a href="Nethttpd_kernel.html#TYPEannouncement">announcement</a> -> </code><code class="type"><a href="Nethttpd_kernel.http_response.html">http_response</a></code></pre><div class="info">
Exported for debugging and testing only
</div>
<pre><span class="keyword">val</span> <a name="VALsend_static_response"></a>send_static_response : <code class="type"><a href="Nethttpd_kernel.http_response.html">http_response</a> -><br> <a href="Nethttp.html#TYPEhttp_status">Nethttp.http_status</a> -> <a href="Nethttp.http_header.html">Nethttp.http_header</a> option -> string -> unit</code></pre><div class="info">
Sends the string argument as response body, together with the given status and
the header (optional). Response header fields are set as follows:<ul>
<li>The <code class="code">Content-Length</code> is set to the length of the string.</li>
<li>The <code class="code">Content-Type</code> is set to "text/html" unless given by the header.</li>
</ul>
<br>
</div>
<pre><span class="keyword">val</span> <a name="VALsend_file_response"></a>send_file_response : <code class="type"><a href="Nethttpd_kernel.http_response.html">http_response</a> -><br> <a href="Nethttp.html#TYPEhttp_status">Nethttp.http_status</a> -><br> <a href="Nethttp.http_header.html">Nethttp.http_header</a> option -> Unix.file_descr -> int64 -> unit</code></pre><div class="info">
Sends the contents of a file as response body, together with the given status and
the header (optional). The descriptor must be a file descriptor (that cannot
block). The int64 number is the length
of the body. Response header fields are set as follows:<ul>
<li>The <code class="code">Content-Length</code> is set to the length of the string.</li>
<li>The <code class="code">Content-Type</code> is set to "text/html" unless given by the header.</li>
</ul>
Note that <code class="code">Content-Range</code> is not set automatically, even if the file is only
partially transferred.
<p>
The function does not send the file immediately, but rather sets the <code class="code">http_response</code>
object up that the next chunk of the file is added when the send queue becomes
empty. This file will be closed when the transfer is done.<br>
</div>
<pre><span class="keyword">type</span> <a name="TYPErequest_line"></a><code class="type"></code>request_line = <code class="type"><a href="Nethttp.html#TYPEhttp_method">Nethttp.http_method</a> * <a href="Nethttp.html#TYPEprotocol">Nethttp.protocol</a></code> </pre>
<div class="info">
The method (including the URI), and the HTTP version<br>
</div>
<pre><span class="keyword">type</span> <a name="TYPEreq_token"></a><code class="type"></code>req_token = <code class="type">[ `Bad_request_error of<br> <a href="Nethttpd_kernel.html#TYPEbad_request_error">bad_request_error</a> * <a href="Nethttpd_kernel.http_response.html">http_response</a><br> | `Eof<br> | `Fatal_error of <a href="Nethttpd_kernel.html#TYPEfatal_error">fatal_error</a><br> | `Req_body of <a href="Nethttpd_kernel.html#TYPEdata_chunk">data_chunk</a><br> | `Req_end<br> | `Req_expect_100_continue<br> | `Req_header of<br> <a href="Nethttpd_kernel.html#TYPErequest_line">request_line</a> * <a href="Nethttp.http_header.html">Nethttp.http_header</a> *<br> <a href="Nethttpd_kernel.http_response.html">http_response</a><br> | `Req_trailer of <a href="Nethttp.http_trailer.html">Nethttp.http_trailer</a><br> | `Timeout ]</code> </pre>
<div class="info">
A <code class="code">req_token</code> represents a textual part of the received request:<ul>
<li><code class="code">`Req_header</code> is the full received header. Together with the header,
the corresponding <code class="code">http_response</code> object is returned which must
be used to transmit the response.</li>
<li><code class="code">`Req_expect_100_continue</code> is generated when the client expects that the
server sends a "100 Contnue" response (or a final status code) now.
One should add <code class="code">`Resp_info_line resp_100_continue</code> to the send queue
if the header is acceptable, or otherwise generate an error response. In any
case, the rest of the request must be read until <code class="code">`Req_end</code>.</li>
<li><code class="code">`Req_body</code> is a part of the request body. The transfer-coding, if any,
is already decoded.</li>
<li><code class="code">`Req_trailer</code> is the received trailer</li>
<li><code class="code">`Req_end</code> indicates the end of the request (the next request may begin
immediately).</li>
<li><code class="code">`Eof</code> indicates the end of the stream</li>
<li><code class="code">`Bad_request_error</code> indicates that the request violated the HTTP protocol
in a serious way and cannot be decoded. It is required to send a
"400 Bad Request" response. The following token will be <code class="code">`Eof</code>.</li>
<li><code class="code">`Fatal_error</code> indicates that the connection crashed.
The following token will be <code class="code">`Eof</code>.</li>
<li><code class="code">`Timeout</code> means that nothing has been received for a certain amount
of time, and the protocol is in a state that the next request can begin.
The following token will be <code class="code">`Eof</code>.</li>
</ul>
Note that it is always allowed to <code class="code">send</code> tokens to the client. The protocol
implementation takes care that the response is transmitted at the right point
in time.<br>
</div>
<pre><span class="keyword">exception</span> <a name="EXCEPTIONRecv_queue_empty"></a>Recv_queue_empty</pre>
<pre><span class="keyword">class type</span> <a name="TYPEhttp_protocol_config"></a><a href="Nethttpd_kernel.http_protocol_config.html">http_protocol_config</a> = <code class="code">object</code> <a href="Nethttpd_kernel.http_protocol_config.html">..</a> <code class="code">end</code></pre><div class="info">
Configuration values for the HTTP kernel
</div>
<pre><span class="keyword">class</span> <a name="TYPEhttp_protocol"></a><a href="Nethttpd_kernel.http_protocol.html">http_protocol</a> : <code class="type">#<a href="Nethttpd_kernel.http_protocol_config.html">http_protocol_config</a> -> Unix.file_descr -> </code><code class="code">object</code> <a href="Nethttpd_kernel.http_protocol.html">..</a> <code class="code">end</code></pre><div class="info">
The core event loop of the HTTP daemon
</div>
<pre><span class="keyword">class</span> <a name="TYPElingering_close"></a><a href="Nethttpd_kernel.lingering_close.html">lingering_close</a> : <code class="type">Unix.file_descr -> </code><code class="code">object</code> <a href="Nethttpd_kernel.lingering_close.html">..</a> <code class="code">end</code></pre><div class="info">
Closes a file descriptor using the "lingering close" algorithm.
</div>
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