[issue2756] urllib2 add_header fails with existing unredirected_header

david reid report at bugs.python.org
Sun May 4 17:11:38 CEST 2008

New submission from david reid <mail at david-reid.com>:

In urllib2 when using reusing a Request calling add_header doesn't work
when an unredirected_header has been added. 

A good example (and the one that caught me out) is content-type. When
making a POST request with no content-type set the current code sets the
content-type as an unredirected_header to
'application/x-www-form-urlencoded' (line 1034 of urllib2.py) but in a
subsequent request, setting the content type via add_header will see
this ignored as unredirected_headers are appended after the headers.

A possible solution is to check whether the header being added already
exists in the requests undredirected_headers and remove it if it does.

components: Library (Lib)
messages: 66213
nosy: zathras
severity: normal
status: open
title: urllib2 add_header fails with existing unredirected_header
type: behavior
versions: Python 2.5

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