Login issue on CiviCRM Standalone: "unexpected error", "All requests that modify the database must be http POST, not GET"

Overview

I have installed CiviCRM on my websapce completely new. Upon trying to login the first time I encounter the following issue:

Possibly its due to the parameters not being passed properly to the API. That's why the API throws out the error message "SECURITY: All requests that modify the database must be http POST, not GET."

I guess it has to to with HTTPS-Connection not being established in a proper way.

I have already posted about this issue in the chat ->

https://chat.civicrm.org/civicrm/pl/cwaxuquf53d93eyqzdpc3ue6yh

Reproduction steps

Install CiviCRM -> Right after try to login the first time

Current behaviour

Upon trying to login, i get the message "Unexpected error"

Expected behaviour

Environment information

I am Using Firefox 133.0 CiviCRM Version 5.80.0 PHP: 8.2.26-nmm1 MariaDB: 10.6.18 Web Server: Apache 2.4

Edited Dec 11, 2024 by naechstenliebe.org

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