Using Relative Paths for HTTP Request String?

I am trying to test api requests to a client that seems to only accept relative paths as part of the HTTP request string. Is there a way to override Postman’s default behavior to use relative/partial paths?

For example, Postman’s default requests are like this:

POST http://servername:port/path HTTP/1.1
Host: servername:port
etc.

And what I would like to be able to do is this:

POST /path HTTP/1.1
Host: servername:port
etc.

Based on reverse engineering from Wireshark, cURL produces the second request and it works, whereas Postman (and a few other clients) produce the first which is giving me a 404.