We have a finicky web application that expects the Accept header to be included in HTTP GET requests. Without it, the web app will return HTTP 500. Right now we can manipulate some of the request headers by selecting certain options and nothing currently available lets me modify the Accept header, but something that allows us to define our own header-header value pairs would be better.
This level of customization would also open up monitoring options for REST APIs without resorting to custom scripts.
