Allowing to fix the request base URL via an env var

[constantinius]

Related Issue(s):

• #581

Description:

A new env var REQUEST_BASE_URL is introduced to fix the base URL to the supplied value. When this variable is not set, the usual way of determining the base URL is used.

PR Checklist:

• [x] pre-commit hooks pass locally
• [x] Tests pass (run make test)
• [ ] Documentation has been updated to reflect changes, if applicable, and docs build successfully (run make docs)
• [ ] Changes are added to the CHANGELOG.

[vincentsarago]

As for https://github.com/stac-utils/stac-fastapi/pull/636, I'm not convince we need this.

If the baseurl is not properly returned by starlette it usually mean there is a configuration issue in the proxy 🤔

[jonhealy1]

Should we close this for now?

[vincentsarago]

@jonhealy1 IMO yes

[jonhealy1]

closing ..... feel free to reopen