Only set X-Forwarded-Proto when header not set #406
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When the seafile docker container
is behind a proxy that does the TLS termination,
such that the seafile docker sees HTTP only,
then, it receives requests
where the following headers are set in the following way:
Because the default NGINX template has this directive:
the request gets transmitted to gunicorn with the following, contradictory values:
Thus Seafile rejects the requests
with a "Contradictory scheme headers" error.
We instead change the header only when it is not set.
Fixes #226.