Retrofit 2 removes characters after hostname from base url

Question

Retrofit 2 uses the same rules that an <a href=""> would.

The leading / on your relative URL tells Retrofit that it is an absolute path on the host. Here's an example from a presentation I gave showing this:

Note the incorrect URL which was resolved at the bottom.

By removing the leading /, the URL then becomes relative and will combine with the path segments which are part of the base URL. Corrected in the presentation the final URL is now correct:

In your example you do not have a trailing / on the base URL. You probably want to add one so that relative paths are resolved on top of it rather than as a sibling of it.