Access response data in JSONP request - ajax

Question

I have a SAP Gateway OData-Service and a local Tomcat Apache Server. My SAPUI5 Client is deployed in the Tomcat and requests a OData-Webservice from the SAP Gateway remote server. In fact there is a cross origin domain error. So I set the header "Access-Control-Allow-Origin" in my OData-Webservice and my SAPUI5 client requests with JSONP, but I will get an error because the SAP Gateway can't handle with JSONP responses.
My code:
The error: "Uncaught SyntaxError: Unexpected token :"
The error depends on the incompatibility of the SAP Gateway to JSONP.
If I look in the network requests I will find this one:
It is the JSON (not JSONP) response from the webservice.
So my question. Is there a possibility to access to this response?
I tried to access via a lot of callbacks like success, error, fail, done, always, complete, and so on. But no chance...
thanks and best regards

Answer 1

$.ajax({
type: 'GET',
url: url,
async: false,
jsonpCallback: 'jsonCallback',
contentType: "application/json",
dataType: 'jsonp',
success: function(response) {
//this is where you'll get data/response
console.log(response) ;
},
error: function(e) {
console.log(e.message);
}
});
Update:
Problem is with your context.. there is some value like _1453458442107=:1
Check that and encode it.

Answer 2

If you set the CORS header "Access-Control-Allow-Origin" in the odata responses you should be able to access the service with regular JSON (without the P).
JSONP is a workaround to circumvent the same origin policy when the CORS-Headers are not available.
If your odata service uses authentification it might be necessary to set some more CORS headers to get it working.
On MDN you can read more about CORS and its headers.
On Wikipedia is a chapter about CORS vs JSONP.
So have you tried something like the following?
$.get({
url:"https://.../sap/opu/odata/sap/ZMOBILAD_SRV/UsernameSet?$format=json",
context: document.body,
cache: false
}).done(function(){
console.log(this);
});