[quantumf]

Could not figure out how to add request headers.

[passfree]

You type them, i.e Header: Value

[quantumf]

Typing the below

GET XUsername:ADMIN https://localhost:443/resources/myresource/1 HTTP/1.1 Host: target

gives an error in the REST: "Your request contains errors"

[passfree]

This request is invalid.