Hello, I have an application that calls a REST web service to obtain a JSON object. The call is:

 

$.ajax({
      type: "GET", 
      url: urlWebService + "/getList" 
      processData: false,
      crossDomain: true,
      dataType: "application/json",
      accepts: "application/json",
      beforeSend: function (req) {
            req.setRequestHeader('Accept', 'application/json');
            req.setRequestHeader("Content-Type", "application/json"); 
      },
      cache: false,
      success: function (msg) {
           response_json = msg;
           callback(response_json);

      },
      error: function (response) {
            alert("Error");
      }
});

The problem is that this call is only working in Firefox. I have tested with last version of other browsers (IE, Chrome, Safari and Opera) and doesn't work because in call headers Accept: undefined, application/json is sent and that 'undefined' makes the service fail. With firefox the header is Accept: application/json and that works ok. That's why I did:

beforeSend: function (req) {
      req.setRequestHeader('Accept', 'application/json');
      req.setRequestHeader("Content-Type", "application/json");
},

but seams that only works on firefox. Any idea? I can't find the solution.