#5791 - Login page might trigger upstream sent too big header error in NGINX

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Identifier #5791
Issue type Minor issue (breaks specific functionality)
Title Login page might trigger upstream sent too big header error in NGINX
Status Open
Tags

Roadmap: v11 (custom)

Handling member Deleted
Version 11 alpha4
Addon core
Description The login page on one of my v11 sites triggers "upstream sent too big header" from NGINX (proxied with PHP-FPM / Apache) when trying to log in.

Many online resources suggest increasing the buffer size. I believe this is bad practice. The issue is likely Composr and that we need to reduce the headers sent by it. Possibly CSP is the culprit?

Investigate this and fix as necessary.
Steps to reproduce

Funded? No
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