Application authentication failed with HTTP Status 403 Forbidden

When a Application like Chronos do the authentication, it fails with an HTTP Status 503.

Because trytond checks the authentication type against a binary auth_type variable, but that does not work in python3.

In python2 the variable auth_type is a unicode type and in python3 it is a string type.

added trytond type::crash + 1 deleted label

the log snippet:

22984 139833599063808 [2017-07-05 09:33:16,298] ERROR trytond.protocols.wrappers _4
/timesheet/employees' [GET]>
Traceback (most recent call last):
File "/home/tryton/venv/trytond_4.4/lib/python3.4/site-packages/trytond/protocols/wrappers.py", line 125, in wrapper
result = func(request, pool, *args, **kwargs)
File "/home/tryton/venv/trytond_4.4/lib/python3.4/site-packages/trytond/protocols/wrappers.py", line 158, in wrapper
abort(403)
File "/home/tryton/venv/trytond_4.4/lib/python3.4/site-packages/werkzeug/exceptions.py", line 707, in abort
return _aborter(status, *args, **kwargs)
File "/home/tryton/venv/trytond_4.4/lib/python3.4/site-packages/werkzeug/exceptions.py", line 687, in __call__
raise self.mappingcode
werkzeug.exceptions.Forbidden: 403 Forbidden: You don't have the permission to access the requested resource. It is either read-protected or not r
eadable by the server.
22984 139833599063808 [2017-07-05 09:33:16,300] INFO werkzeug 192.168.26.146 - - [05/Jul/2017 09:33:16] "GET /test_demo_4_4/timesheet/employee
s HTTP/1.1" 403 -
22984 139833599063808 [2017-07-05 09:33:16,491] INFO werkzeug 192.168.26.146 - - [05/Jul/2017 09:33:16] "GET /test_demo_4_4/timesheet/employee
/null/lines/2017-07-05 HTTP/1.1" 404 -
22984 139833599063808 [2017-07-05 09:33:19,279] INFO werkzeug 192.168.26.146 - - [05/Jul/2017 09:33:19] "GET /test_demo_4_4/timesheet/employee
/null/works HTTP/1.1" 404 -

added 1 deleted label and removed 1 deleted label

assigned to @springwurm

review36441002 updated at https://codereview.tryton.org/36441002/#ps1

added 1 deleted label and removed 1 deleted label

review36441002 updated at https://codereview.tryton.org/36441002/#ps20001

New changeset e82942de23c1 by brunnenschacht in branch 'default':
Ensure the proper encoding for the authentication header response
http://hg.tryton.org/trytond/rev/e82942de23c1

added 1 deleted label and removed 1 deleted label

closed

New changeset e9a3cd2097ed by brunnenschacht in branch '4.4':
Ensure the proper encoding for the authentication header response
http://hg.tryton.org/trytond/rev/e9a3cd2097ed

New changeset f71f8262998b by brunnenschacht in branch '4.2':
Ensure the proper encoding for the authentication header response
http://hg.tryton.org/trytond/rev/f71f8262998b