message parser

diff --git a/http/Message/Parser.md b/http/Message/Parser.md
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+# class http\Message\Parser
+
+The parser which is underlying http\Message.
+
+## Changelog:
+
+| Version | Change 
+|---------|--------
+| 2.2.0   | Added http\Message\Parser API
+
+## Constants:
+
+### Parser flags:
+
+* CLEANUP  
+  Finish up parser at end of (incomplete) input.
+* DUMB_BODIES  
+  Soak up the rest of input if no entity length is deducible.
+* EMPTY_REDIRECTS  
+  Redirect messages do not contain any body despite of indication of such.
+* GREEDY  
+  Continue parsing while input is available.
+
+### Parser states:
+
+* STATE_FAILURE  
+  Parse failure.
+* STATE_START  
+  Expecting HTTP info (request/response line) or headers.
+* STATE_HEADER  
+  Parsing headers.
+* STATE_HEADER_DONE  
+  Completed parsing headers.
+* STATE_BODY  
+  Parsing the body.
+* STATE_BODY_DUMB  
+  Soaking up all input as body.
+* STATE_BODY_LENGTH  
+  Reading body as indicated by `Content-Lenght` or `Content-Range`.
+* STATE_BODY_CHUNKED  
+  Parsing `chunked` encoded body.
+* STATE_BODY_DONE  
+  Finished parsing the body.
+* STATE_DONE  
+  Finished parsing the message.

diff --git a/http/Message/Parser/getState.md b/http/Message/Parser/getState.md
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+# int http\Message\Parser::getState()
+
+Retrieve the current state of the parser.
+See http\Message\Parser::STATE_* constants.
+
+## Params:
+
+None.
+
+## Returns:
+
+* int, http\Message\Parser::STATE_* constant.
+
+## Throws:
+
+* http\Exception\InvalidArgumentException

diff --git a/http/Message/Parser/parse.md b/http/Message/Parser/parse.md
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+# int http\Message\Parser::parse(string $data, int $flags, http\Message &$message)
+
+Parse a string.
+
+## Params:
+
+* string $data  
+  The (part of the) message to parse.
+* int $flags  
+  Any combination of [parser flags](http/Message/Parser#Parser.flags:).
+* http\Message &$message  
+  The current state of the message parsed.
+
+## Returns:
+
+* int, http\Message\Parser::STATE_* constant.
+
+## Throws:
+
+* http\Exception\InvalidArgumentException

diff --git a/http/Message/Parser/stream.md b/http/Message/Parser/stream.md
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+# int http\Message\Parser::stream(resource $stream, int $flags, http\Message &$message)
+
+Parse a stream.
+
+## Params:
+
+* stream $resource  
+  The message stream to parse from.
+* int $flags  
+  Any combination of [parser flags](http/Message/Parser#Parser.flags:).
+* http\Message &$message  
+  The current state of the message parsed.
+
+## Returns:
+
+* int, http\Message\Parser::STATE_* constant.
+
+## Throws:
+
+* http\Exception\InvalidArgumentException
+* http\Exception\UnexpectedValueException