There were two problems preventing building and unit tests from

succeeding:

The invocation of logRequest in server.go had a typo, using

  curly-braces instead of parentheses.
The test for getting the config port used a %s in a format

  string where it should have used a %d (this is an issue where the

  runtime got more strict).

Was able to build rb-gateway.
Ran go test.