APIcast appends a trailing slash to the Upstream URL

Issue

• When at least one backend is configured in Integration / Backends for a Product, with a Public Path different than /, APIcast appends a trailing / to the end of the path of the Upstream as in the following example:

  Private Base URL of backend1: https://echo-api.3scale.net:443/foo
  Backend Usage Public Path: /backend1
  Request: curl https://api-apicast-staging.testing:443/backend1?user_key=abc
  Response:

  {
  "method": "GET",
  "path": "/foo/",
  [...]
  

  As visible, APIcast is accessing the Upstream at: https://echo-api.3scale.net:443/foo/, i.e. with a trailing slash