[Flask] flask url_for / nginx proxy_pass

[Pascal]

hello,

my flask app (flaskbb <https://github.com/sh4nks/flaskbb>) is listening on
127.0.0.1:8765 and is ok when accessed directly with http://127.0.0.1:8765/.

when accessed through nginx with http://mywebserver/flaskbb/, all links are
broken because /flaskbb is missing in the url (eg. src="/css/..." and not
src="/flaskbb/css/...").

I currently bypasses the problem by modifying the templates, but it's not
clean :-(

how can I solve this problem ?

note that nginx directive is location /flaskbb/ { proxy_pass
http://127.0.0.1:8765/; } and I can't play with virtual-server/dns.
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