HTTP Reverse Proxy: failed proxying [GET]

[candyman2903]

Hello,

I get the following error:

DEBU[0008] HTTP gateway (catch-all): proxying method=GET uri=/_matrix/client/versions
DEBU[0008] HTTP gateway (intercepted): proxying handler=login method=POST type=m.login.password uri=/_matrix/client/r0/login userId="@matrix-corporal:matrix.xxxxxx.de"
DEBU[0008] HTTP gateway (intercepted): proxying handler=login method=POST type=m.login.password uri=/_matrix/client/r0/login userId="@matrix-corporal:matrix.xxxxx.de"
DEBU[0008] HTTP gateway (catch-all): proxying method=GET uri=/_matrix/client/versions
ERRO[0008] HTTP Reverse Proxy: failed proxying [GET] https://matrix.xxxxx.de/_matrix/client/versions: context canceled
ERRO[0008] HTTP Reverse Proxy: failed proxying [GET] https://matrix.xxxxx.de/_matrix/client/versions: context canceled
DEBU[0008] HTTP gateway (catch-all): proxying method=GET uri=/_matrix/client/versions
ERRO[0008] HTTP Reverse Proxy: failed proxying [GET] https://matrix.xxxxx.de/_matrix/client/versions: context canceled
ERRO[0008] HTTP Reverse Proxy: failed proxying [GET] https://matrix.xxxxx.de/_matrix/client/versions: context canceled
ERRO[0008] HTTP Reverse Proxy: failed proxying [GET] https://matrix.xxxxx.de/_matrix/client/versions: context canceled
ERRO[0008] HTTP Reverse Proxy: failed proxying [GET] https://matrix.xxxxx.de/_matrix/client/versions: context canceled

I currently have no idea where to fix this. The error message comes when I enter the server path in element.

Thank you in advance for the help.

Edit: Can anyone help me here? Even for a small donation?