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52<h2><a name="SECTION002130000000000000000"></a>
53<a name="response-objects"></a>
54<br>
551.1.3 Response Objects
56</h2>
57
58<p>
59Response objects are derived from <tt class="class">dict</tt> and map
60header names (lower case with the trailing colon removed)
61to header values. In addition to the dict methods
62a Response object also has:
63
64<p>
65<dl><dt><b><tt id='l2h-26' xml:id='l2h-26' class="member">fromcache</tt></b></dt>
66<dd>
67If <code>true</code> the the response was returned from the cache.
68</dl>
69
70<p>
71<dl><dt><b><tt id='l2h-27' xml:id='l2h-27' class="member">version</tt></b></dt>
72<dd>
73The version of HTTP that the server supports. A value
74of 11 means '1.1'.
75</dl>
76
77<p>
78<dl><dt><b><tt id='l2h-28' xml:id='l2h-28' class="member">status</tt></b></dt>
79<dd>
80The numerical HTTP status code returned in the response.
81</dl>
82
83<p>
84<dl><dt><b><tt id='l2h-29' xml:id='l2h-29' class="member">reason</tt></b></dt>
85<dd>
86The human readable component of the HTTP response status code.
87</dl>
88
89<p>
90<dl><dt><b><tt id='l2h-30' xml:id='l2h-30' class="member">previous</tt></b></dt>
91<dd>
92If redirects are followed then the <tt class="class">Response</tt> object returned
93is just for the very last HTTP request and <var>previous</var> points to
94the previous <tt class="class">Response</tt> object. In this manner they form a chain
95going back through the responses to the very first response.
96Will be <code>None</code> if there are no previous respones.
97</dl>
98
99<p>
100The Response object also populates the header <code>content-location</code>, that
101contains the URI that was ultimately requested. This is useful if
102redirects were encountered, you can determine the ultimate URI that
103the request was sent to. All Response objects contain this key value,
104including <code>previous</code> responses so you can determine the entire
105chain of redirects. If <tt class="member">Http.force_exception_to_status_code</tt> is <code>True</code>
106and the number of redirects has exceeded the number of allowed number
107of redirects then the <tt class="class">Response</tt> object will report the error
108in the status code, but the complete chain of previous responses will
109still be in tact.
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