How to use dataType: 'jsonp' but still have application/json in Accept header?
http, jquery, json, jsonp
Solution
AFAIK jQuery's implementation of JSONP uses a `<script>` tag that is injected into the DOM (thus the restriction to the GET verb only) for which you cannot control the `Accept` request content type header. The `src` of this `script` tag is simply pointed to the remote domain url. It is the browser that simply fetches the underlying endpoint sending a regular GET request.
So if you want to be able to set request headers for cross domain calls you will have to setup a server side script on your domain that will delegate the call to the remote domain (and set the respective headers) and then send the AJAX request to your script.
Problem
I want to access a REST service on another domain. If, in JQuery, I specify: ``` dataType: 'json' ``` it fails, as expected, since for cross-domain calls, JSONP must be used instead. When I change this to: ``` dataType: 'jsonp' ``` it is expected to work, but fails because the server expects `application/json` or `application/xml` or `text/html`, etc., but not `*/*`, sent by the JSONP request. Is there a way to force JQuery to put `application/json` in `Accept` request header while doing a JSON request?