### Steps to reproduce Begin of the insertion

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End of the deletion 0\. Run an openproject instance behind a relative url like /openproject Begin of the insertion

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End of the deletion ```text
docker run --rm -e OPENPROJECT_HOST__NAME=localhost:9090 -e SECRET_KEY_BASE=42 -e OPENPROJECT_RAILS__RELATIVE__URL__ROOT=/openproject -e OPENPROJECT_HTTPS=false -p 9090:80 -it openproject/openproject:17.4
```

1. Log into OpenProject and open a browser console network tab, where you can observe if GET requests come back with 404. Begin of the insertion

End of the insertion Begin of the deletion


End of the deletion 2. Use the document module of OpenProject and create a new document


### Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion What is the buggy behavior? Begin of the insertion

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End of the deletion * blocknote css can't be found

* documents url does not contain the prefix

* the relative root url is not correctly applied


### What is the expected behavior?

<br>

1. The correct relative root url (e.g. /openproject) should be respected

<br>


### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/921285/content"> Begin of the deletion

End of the deletion <img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/921287/content">

### Environment information

<br>

**OpenProject version**

_17.4_