Wsgi problem with unicode in headers on Win32

[alvaro.iradier@…]

Trying to set up trac on windows XP, using mod_wsgi 3.0, with Apache 2.2.14, and Python 2.6.4.

I follow the setup instructions in:

​http://code.google.com/p/modwsgi/wiki/IntegrationWithTrac

Apparently Trac works fine, but when trying to login, I get error 500, and the following lines are in the Apache Error Log:

[Fri Feb 12 13:32:05 2010] [error] [client 127.0.0.1] mod_wsgi (pid=3620): Exception occurred processing WSGI script 'C:/trac_envs/polar/trac.wsgi'., referer: http://localhost:8080/trac/polar/ACOMON/login
[Fri Feb 12 13:32:05 2010] [error] [client 127.0.0.1] TypeError: expected byte string object for header value, value of type unicode found, referer: http://localhost:8080/trac/polar/ACOMON/login

Digging into the problem, I find Trac is including some cookies using unicode strings in the response headers when logging in. These are the header values:

[Fri Feb 12 10:58:41 2010] [error] Headers: 
[Fri Feb 12 10:58:41 2010] [error]     ('Location', 'http://localhost:8080/trac/polar/ACOMON')
[Fri Feb 12 10:58:41 2010] [error]     ('Content-Type', 'text/plain')
[Fri Feb 12 10:58:41 2010] [error]     ('Content-Length', '0')
[Fri Feb 12 10:58:41 2010] [error]     ('Pragma', 'no-cache')
[Fri Feb 12 10:58:41 2010] [error]     ('Cache-control', 'no-cache')
[Fri Feb 12 10:58:41 2010] [error]     ('Expires', 'Fri, 01 Jan 1999 00:00:00 GMT')
[Fri Feb 12 10:58:41 2010] [error]     ('Set-Cookie', u'trac_auth=3cc465674792189bff8075bb608d31c3; Path=/')
[Fri Feb 12 10:58:41 2010] [error]     ('Set-Cookie', u'trac_session=2288750e31713fc8e7f3db41; expires=Fri, 12-Feb-2010 09:58:41 GMT; Path=/trac/polar/ACOMON')

I manage to fix it using the following trac.wsgi script:

import sys
sys.stdout = sys.stderr

def _start_response(x, status, headers, exc_info = ""):
    #Fix Trac using unicode in header values
    for i in range(len(headers)):
        headers[i] = (headers[i][0], str(headers[i][1]))
    return x(status, headers, exc_info)

def application(environ, start_response):
    import trac.web.main
    x = lambda status, headers, exc_info=None: _start_response(start_response, status, headers, exc_info)
    return trac.web.main.dispatch_request(environ, x)

Problem is in trac_auth and trac_session cookies, as they are unicode strings, which seems not supported according to WSGI standard.

Is it necessary to use UTF-8 in these headers or should it be fixed?

[Remy Blank]

Closing this as a duplicate of #9176. This ticket was first, but #9176 has a proposed fix.