added (incomplete) request-response doc

--HG--
extra : convert_revision : svn%3Ab85faa78-f9eb-468e-a121-7cced6da292c%40627

scrapy/trunk/docs/ref/index.rst

@@ -5,5 +5,6 @@ Reference
    :maxdepth: 1
 
    exceptions
+   request-response
    settings
    signals

scrapy/trunk/docs/ref/request-response.rst

@@ -0,0 +1,115 @@
+.. _ref-request-response:
+
+============================
+Request and Response objects
+============================
+
+.. module:: scrapy.http
+   :synopsis: Classes dealing with HTTP requests and responses.
+
+Quick overview
+==============
+
+Scrapy uses requests and response objects for crawling web sites. 
+
+Typically, :class:`Request` objects are generated is the spiders and pass
+across the system until they reach the downloader which ends up performing the
+requests and downloading a HTTP url, to finally generate a :class:`Response`
+object that returns to the spider which generated the request.
+
+Request objects
+===============
+
+.. class:: Request
+
+Attributes
+----------
+
+.. attribute:: Request.method
+
+    A string representing the HTTP method in the request. This is guaranteed to
+    be uppercase. Example: ``"GET"``, ``"POST"``, ``"PUT"``, etc
+
+.. attribute:: Request.headers
+
+    A dict of the request headers.
+
+.. attribute:: Request.body
+
+    The body of the request as a string
+
+Methods
+-------
+
+.. method:: Request.__init__(url, callback=None, context=None, method=None, body=None, headers=None, cookies=None, referer=None, url_encoding='utf-8', link_text='', http_user='', http_pass='', dont_filter=None)
+
+    Instantiates a ``Request`` object with the given arguments:
+
+    ``url`` is a string containing the URL for this request
+
+    ``callback`` is a function that will be called with the response of this
+    request (once its downloaded) as its first parameter
+
+    ``context`` can be a dict which will be accesible in the callback function
+    in ``response.request.context`` in the callback function
+
+    ``body`` is a string containing the request body or None if the request doesn't contain a body (ex. GET requests)
+
+    ``headers`` is a multi-valued dict containing the headers of this request
+
+    ``cookies`` is dict of the request cookies
+
+    ``referer`` is a string with the referer of this request
+
+    ``url_encoding`` is a string with the encoding of the url of this request.
+     Requests URLs will be percent encoded using this encoding before downloading 
+
+    ``link_text`` is a string describing the URL of this requests. For example, in ``<a href="http://www.example.com/">Example site</a>`` the ``link_text`` would be ``"Example site"``
+
+    ``http_user`` is a string containing the user name that will be used for
+    HTTP authentication when performing this request. If None, HTTP auth will
+    not be used
+
+    ``http_user`` is a string containing the password that will be used for
+    HTTP authentication when performing this request. If None, HTTP auth will
+    not be used
+
+    ``dont_filter`` is a boolean which indicates that this request should not
+    be filtered by the scheduler. This is used when you want to perform an
+    identical request multiple times, for whatever reason
+
+.. class:: Response
+
+Response objects
+================
+
+Attributes
+----------
+
+.. attribute:: Response.status
+
+    An integer representing the HTTP status in the response. Example: ``200``,
+    ``404``, etc
+
+.. attribute:: Response.headers
+
+    A dict of the response headers.
+
+Methods
+-------
+
+.. method:: __init__(domain, url, original_url=None, headers=None, status=200, body=None)
+
+    Instantiates a ``Response`` object with the given arguments:
+
+    ``url`` is a string containing the URL for this response
+
+    ``original_url`` is a string containing the url from which this response
+    was redirected (only for redirected responses)
+
+    ``headers`` is a multivalued dict of the response headers
+
+    ``status`` is an integer with the HTTP status of the response
+
+    ``body`` is a string (or unicode) containing the response body
+