Allow serving in subpath

Redirections can be tricky if the server can not be served with a different subpath.

When we serve the API using a subpath that rewrites to the root it will cause wrong redirection locations causing the base subpath will be missing.

Example:

-> https://earth.bsc.es/autosubmitapi/redirect -> host/redirect -> return Redirect(Location=/target_location) -> https://earth.bsc.es/target_location -> 404