3 OCaml HTTP - do it yourself (fully OCaml) HTTP daemon
5 Copyright (C) <2002> Stefano Zacchiroli <zack@cs.unibo.it>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 (** Type definitions *)
24 (** HTTP version, actually only 1.0 and 1.1 are supported. Note that
25 'supported' here means only 'accepted inside a HTTP request line', no
26 different behaviours are actually implemented depending on HTTP version *)
32 (** HTTP method, actually only GET and POST methods are supported *)
38 (** Daemon behaviour wrt request handling. `Single mode use a single process
39 to handle all requests, no request is served until a previous one has been
40 fully served. `Fork mode fork a new process for each request, the new process
41 will execute the callback function and then exit. `Thread mode create a new
42 thread for each request, the new thread will execute the callback function and
43 then exit, threads can communicate using standard OCaml Thread library. *)
44 type daemon_mode = [ `Single | `Fork | `Thread ]
46 (** A TCP server is a function taking an address on which bind and listen for
47 connections, an optional timeout after which abort client connections and a
48 callback function which in turn takes an input and an output channel as
49 arguments. After receiving this argument a TCP server sits and waits for
50 connection, on each connection it apply the callback function to channels
51 connected to client. *)
53 sockaddr:Unix.sockaddr -> timeout:int option ->
54 (in_channel -> out_channel -> unit) ->
57 (** informational HTTP status, see RFC2616 *)
58 type informational_substatus =
60 | `Switching_protocols
63 (** success HTTP status, see RFC2616 *)
64 type success_substatus =
68 | `Non_authoritative_information
74 (** redirection HTTP status, see RFC2616 *)
75 type redirection_substatus =
85 (** client error HTTP status, see RFC2616 *)
86 type client_error_substatus =
94 | `Proxy_authentication_required
99 | `Precondition_failed
100 | `Request_entity_too_large
101 | `Request_URI_too_large
102 | `Unsupported_media_type
103 | `Requested_range_not_satisfiable
104 | `Expectation_failed
107 (** server error HTTP status, see RFC2616 *)
108 type server_error_substatus =
109 [ `Internal_server_error
112 | `Service_unavailable
114 | `HTTP_version_not_supported
117 type informational_status = [ `Informational of informational_substatus ]
118 type success_status = [ `Success of success_substatus ]
119 type redirection_status = [ `Redirection of redirection_substatus ]
120 type client_error_status = [ `Client_error of client_error_substatus ]
121 type server_error_status = [ `Server_error of server_error_substatus ]
124 [ client_error_status
125 | server_error_status
130 [ informational_status
133 | client_error_status
134 | server_error_status
137 (** {2 Exceptions} *)
139 (** invalid header encountered *)
140 exception Invalid_header of string
142 (** invalid header name encountered *)
143 exception Invalid_header_name of string
145 (** invalid header value encountered *)
146 exception Invalid_header_value of string
148 (** unsupported or invalid HTTP version encountered *)
149 exception Invalid_HTTP_version of string
151 (** unsupported or invalid HTTP method encountered *)
152 exception Invalid_HTTP_method of string
154 (** invalid HTTP status code integer representation encountered *)
155 exception Invalid_code of int
157 (** invalid URL encountered *)
158 exception Malformed_URL of string
160 (** invalid query string encountered *)
161 exception Malformed_query of string
163 (** invalid query string part encountered, arguments are parameter name and
165 exception Malformed_query_part of string * string
167 (** invalid request URI encountered *)
168 exception Malformed_request_URI of string
170 (** malformed request received *)
171 exception Malformed_request of string
173 (** a parameter you were looking for was not found *)
174 exception Param_not_found of string
176 (** invalid HTTP status line encountered *)
177 exception Invalid_status_line of string
179 (** an header you were looking for was not found *)
180 exception Header_not_found of string
182 (** raisable by callback functions to make main daemon quit, this is the only
183 'clean' way to make start functions return *)
186 (** {2 OO representation of HTTP messages} *)
188 (** HTTP generic messages. See {! Http_message.message} *)
189 class type message = object
191 method version: version option
192 method setVersion: version -> unit
195 method setBody: string -> unit
196 method bodyBuf: Buffer.t
197 method setBodyBuf: Buffer.t -> unit
198 method addBody: string -> unit
199 method addBodyBuf: Buffer.t -> unit
201 method addHeader: name:string -> value:string -> unit
202 method addHeaders: (string * string) list -> unit
203 method replaceHeader: name:string -> value:string -> unit
204 method replaceHeaders: (string * string) list -> unit
205 method removeHeader: name:string -> unit
206 method hasHeader: name:string -> bool
207 method header: name:string -> string
208 method headers: (string * string) list
210 method clientSockaddr: Unix.sockaddr
211 method clientAddr: string
212 method clientPort: int
214 method serverSockaddr: Unix.sockaddr
215 method serverAddr: string
216 method serverPort: int
218 method toString: string
219 method serialize: out_channel -> unit
224 class type request = object
226 (** an HTTP request is a flavour of HTTP message *)
229 (** @return request method *)
232 (** @return requested URI (including query string, fragment, ...) *)
235 (** @return requested path *)
238 (** lookup a given parameter
239 @param meth if given restrict the lookup area (e.g. if meth = POST than
240 only parameters received via POST are searched), if not given both GET and
241 POST parameter are searched in an unspecified order (actually the
242 implementation prefers POST parameters but this is not granted, you've
244 @param name name of the parameter to lookup
245 @return value associated to parameter name
246 @raise Param_not_found if parameter name was not found *)
247 method param: ?meth:meth -> string -> string
249 (** like param above but return a list of values associated to given
250 parameter (a parameter could be defined indeed more than once: passed more
251 than once in a query string or passed both insider the url (the GET way)
252 and inside message body (the POST way)) *)
253 method paramAll: ?meth:meth -> string -> string list
255 (** @return the list of all received parameters *)
256 method params: (string * string) list
258 (** @return the list of all parameters received via GET *)
259 method params_GET: (string * string) list
261 (** @return the list of all parameter received via POST *)
262 method params_POST: (string * string) list
266 (** HTTP responses *)
267 class type response = object
271 (** @return response code *)
274 (** set response code *)
275 method setCode: int -> unit
277 (** @return response status, see {! Http_types.status} *)
278 method status: status
280 (** set response status *)
281 method setStatus: status -> unit
283 (** @return reason string *)
284 method reason: string
286 (** set reason string *)
287 method setReason: string -> unit
289 (** @return status line *)
290 method statusLine: string
293 @raise Invalid_status_line if an invalid HTTP status line was passed *)
294 method setStatusLine: string -> unit
296 (** response is an informational one *)
297 method isInformational: bool
299 (** response is a success one *)
300 method isSuccess: bool
302 (** response is a redirection one *)
303 method isRedirection: bool
305 (** response is a client error one *)
306 method isClientError: bool
308 (** response is a server error one *)
309 method isServerError: bool
311 (** response is either a client error or a server error response *)
314 (** add basic headers to response, see {! Http_daemon.send_basic_headers}
316 method addBasicHeaders: unit
318 (** facilities to access some frequently used headers *)
320 (** @return Content-Type header value *)
321 method contentType: string
323 (** set Content-Type header value *)
324 method setContentType: string -> unit
326 (** @return Content-Encoding header value *)
327 method contentEncoding: string
329 (** set Content-Encoding header value *)
330 method setContentEncoding: string -> unit
332 (** @return Date header value *)
335 (** set Date header value *)
336 method setDate: string -> unit
338 (** @return Expires header value *)
339 method expires: string
341 (** set Expires header value *)
342 method setExpires: string -> unit
344 (** @return Server header value *)
345 method server: string
347 (** set Server header value *)
348 method setServer: string -> unit
352 (** {2 OO representation of other HTTP "entities"} *)
354 (** an HTTP connection from a client to a server *)
355 class type connection =
357 (** @return next request object, may block if client hasn't submitted any
358 request yet, may be None if client request was ill-formed *)
359 method getRequest: request option
361 (** respond to client sending it a response *)
362 method respond_with: response -> unit
364 (** close connection to client. Warning: this object can't be used any
365 longer after this method has been called *)
369 (** an HTTP daemon *)
372 (** @return a connection to a client, may block if no client has connected
374 method accept: connection
376 (** shortcut method, blocks until a client has submit a request and
377 return a pair request * connection *)
378 method getRequest: request * connection