Rest outbound call using authCode and Content-Type application/x-www-form-urlencoded

x-www-form-urlencoded is not a standard content type for data transmission. You might be referring to application/x-www-form-urlencoded, which is a common content type used when submitting data through HTML forms on the web. It is a way of encoding key-value pairs as a string in the format of key1=value1&key2=value2. 

Steps are as follows. :  

 Create scripted rest api and create a method  

  Override default supported request formats as : application/x-www-form-urlencoded 

Scripted resource as follows :

 can retrieve the urlencoded values provided in the request as a JSON map. You can then supply these urlencoded key-value pairs as query parameters, in the request body, or both. They are combined and stored in the request parameters. Access these parameters through the request.queryParams object. 

Testing : 

We are getting 200 ok.