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mads

mail: fix duplicate "From" headers

Problem introduced in 9a0c41175e66: When iterating the headers dict and setting
"msg[key] = value", it wasn't replacing the header but performing add_header so
we sometimes ended up with two From headers.

It is also a general problem that while the headers dict only can contain each
key once, it can contain entries that only differ in casing and thus will fold
to the same message header, making it possible to end up adding duplicate
headers.

"msg.replace_header(key, value)" is not a simple solution to the problem: it
will raise KeyError if no such previous key exists.

Now, make the problem more clear by explicitly using add_header.

Avoid the duplication problem by deleting the key (no matter which casing)
before invoking add_header. Delete promises that "No exception is raised if the
named field isn’t present in the headers".

.. _troubleshooting:

===============
Troubleshooting
===============

:Q: **Missing static files?**
:A: Make sure either to set the ``static_files = true`` in the .ini file or
   double check the root path for your http setup. It should point to
   for example:
   ``/home/my-virtual-python/lib/python3.7/site-packages/kallithea/public``

|

:Q: **Can't install celery/rabbitmq?**
:A: Don't worry. Kallithea works without them, too. No extra setup is required.
    Try out the great Celery docs for further help.

|

:Q: **Long lasting push timeouts?**
:A: Make sure you set a longer timeout in your proxy/fcgi settings. Timeouts
    are caused by the http server and not Kallithea.

|

:Q: **Large pushes timeouts?**
:A: Make sure you set a proper ``max_body_size`` for the http server. Very often
    Apache, Nginx, or other http servers kill the connection due to to large
    body.

|

:Q: **Apache doesn't pass basicAuth on pull/push?**
:A: Make sure you added ``WSGIPassAuthorization true``.

|

:Q: **Git fails on push/pull?**
:A: Make sure you're using a WSGI http server that can handle chunked encoding
    such as ``waitress`` or ``gunicorn``.

|

:Q: **How can I use hooks in Kallithea?**
:A: It's easy if they are Python hooks: just use advanced link in
    hooks section in Admin panel, that works only for Mercurial. If
    you want to use Git hooks, just install th proper one in the repository,
    e.g., create a file `/gitrepo/hooks/pre-receive`. You can also use
    Kallithea-extensions to connect to callback hooks, for both Git
    and Mercurial.

|

:Q: **Kallithea is slow for me, how can I make it faster?**
:A: See the :ref:`performance` section.

|

:Q: **UnicodeDecodeError on Apache mod_wsgi**
:A: Please read: https://docs.djangoproject.com/en/dev/howto/deployment/wsgi/modwsgi/#if-you-get-a-unicodeencodeerror.

|

:Q: **Requests hanging on Windows**
:A: Please try out with disabled Antivirus software, there are some known problems with Eset Antivirus. Make sure
    you have installed the latest Windows patches (especially KB2789397).


.. _python: http://www.python.org/
.. _mercurial: https://www.mercurial-scm.org/
.. _celery: http://celeryproject.org/
.. _rabbitmq: http://www.rabbitmq.com/
.. _python-ldap: http://www.python-ldap.org/