inbound validly escaped URLs are unescaped before they are sent outbound for proxy repositories instead of sent as is

If you send a request like this to a proxy repository:

Nexus 2
http://localhost:8081/nexus/content/repositories/amazon-main/201703c0ffee/x86_64/gcc-c%2B%2B-4.8.3-3.20.amzn1.noarch.rpm

Nexus 3:
http://localhost:8081/repository/amazon-main/201703c0ffee/x86_64/gcc-c%2B%2B-4.8.3-3.20.amzn1.noarch.rpm

The outbound request from Nexus to the remote URL will not have the "+" character escaped.  This will result in a failure to retrieve the requested file.

Expected:

If the inbound URL is a valid escaped URL, then send that exact same request path outbound escaping unchanged because this will mean if something different is wanted, then it will be up to the client making the original request to send something different.