Solved
Getting a 406 - Unable to resolve Accept header to a representation on Rest request
I receive a 406 - Not acceptable RAW request : PUT https://api.********.com/contractor/index/3884?indexType=basic HTTP/1.1 Content-Type: application/json Content-Length: 0 Host: api.******...
Also, I can recommend comparing a successful (or expected) raw request with a raw request from ReadyAPI.
To get a raw request in ReadyAPI, please switch to the Raw tab on the left side of the Request Editor.
To get a Raw request in Postman http://screencast.com/t/LpyQIAIH, click the Code button and choose HTTP: http://screencast.com/t/SLEdPUNX
Or, you can use Fiddler (http://www.telerik.com/download/fiddler) which is a free tool to capture HTTP(S) traffic.
