Backend: Bug in API improvements
# Description
After having merged the API improvements, the API works fine locally, but returns a `405` on the dev server.
## I expected the following to happen
HTTP `200`
## On the contrary, I observed
HTTP `405`
# How to reproduce the bug
_Steps:_
* log in to VPN (SUB!)
* cURL https://ahikar-test.sub.uni-goettingen.de/api/textapi/ahikar/3r9ps/collection.json
# Severity
How much impact does this bug have on the product or further development?
* [x] Blocker
# Platform
* [x] Unix
* [x] Windows
* [x] MacOS
# Browser
* [x] all
# Program and – if applicable – dependency version
Which version of the software did you use?
0.4.1
/cc [Mathias Göbel](https://gitlab.gwdg.de/mgoebel), [Frank Schneider](https://gitlab.gwdg.de/schneider210), [Michelle Weidling](https://gitlab.gwdg.de/mrodzis)
issue