I read the document.
but I think I must have misunderstood it.
$http.defaults.headers.jsonp = { \'Accept\' : \'application/json\'};
$http.jsonp(url).
There is no way to control headers sent by a browser while using JSONP. JSONP is a smart trick (or a hack, depending on how you see it...) that consist of inserting a <script>
tag pointing to a server endpoint. Ultimately it is a browser who will decide which headers to sent while requesting scripts via <script>
tag and you can't influence it.
More info here: Modify HTTP Headers for a JSONP request