git-deps web UI server route doesn't seem to handle slashes correctly

At the company where I work, we use some conventions around branch names, including prefixing feature branches with feat/ and bugfix branches with fix/. When I feed one of those into the UI's input and submit, a request is sent to the server and answered with a 404 code.

Despite their similarity, that probably isn't a duplicate of #74, as 422 is the code sent when the server actually receives and treats the request, but the requested commit-ish isn't found. I couldn't find any related issues.

Does anyone get the same behavior? I'm using it under Ubuntu 16.04 and Python 3.5.2.