X-Forwarded-Prefix not supported

[de-code]

Steps to reproduce

1. Use a reverse proxy that maps /nextcloud to / (e.g. Traefik with PathPrefixStrip)
2. The prefix will be available as the X-Forwarded-Prefix header

Expected behaviour

Generated URLs should respect the prefix, e.g. add /nextcloud

Actual behaviour

The provided prefix is ignored and assets use an URL without the prefix.
As a workaround the prefix can be added to the overwritewebroot config option.

e.g.

if (isset($_SERVER['HTTP_X_FORWARDED_PREFIX'])) {
  $CONFIG['overwritewebroot'] = $_SERVER['HTTP_X_FORWARDED_PREFIX'];
}

[nextcloud-bot]

GitMate.io thinks possibly related issues are #3161 (Support HHVM), #3805 (predis support), #3761 (PostgreSQL support), #2494 (Sqlite support), and #11964 (Forwarded ExpiredTokenException).

[szaimen]

Is this Issue still valid? If not, please close this issue. Thanks! :)

[ghost]

This issue has been automatically marked as stale because it has not had recent activity and seems to be missing some essential information. It will be closed if no further activity occurs. Thank you for your contributions.

[de-code]

Has anything relating to HTTP_X_FORWARDED_PREFIX / X-Forwarded-Prefix been added to the server? (I can't find anything in the code)
Do you believe that another header variable should be set by the reverse proxy?

[de-code]

In case it is helpful, someone compiled a list of feature requests / issues in other open source software: dotnet/aspnetcore#23263 (comment)

[szaimen]

cc @nextcloud/server-triage is this feasible?

[ghost]

This issue has been automatically marked as stale because it has not had recent activity and seems to be missing some essential information. It will be closed if no further activity occurs. Thank you for your contributions.

[de-code]

I understand it didn't get much activity. But what info is needed? I provided a workaround code snipped and there are a number of similar PRs in other projects.

[ghost]

This issue has been automatically marked as stale because it has not had recent activity and seems to be missing some essential information. It will be closed if no further activity occurs. Thank you for your contributions.

[de-code]

Could someone please remove the needsinfo tag or advise what information is needed?

[ghost]

This issue has been automatically marked as stale because it has not had recent activity and seems to be missing some essential information. It will be closed if no further activity occurs. Thank you for your contributions.