jQuery Ajax调用失败，未授权401

我有一个jquery ajax POST到代码隐藏的webmethod.在该网络方法中，我对返回json的第三方网络api服务执行HttpWebRequest.即使httpwebrequest正常运行，浏览器中也会出现一个弹出窗口，要求我输入凭据(需要身份验证).在我的计算机上，此方法运行良好，但是在部署时，除非httpwebrequest调用未返回任何数据，否则它不能正常工作.

I have a jquery ajax POST to a code-behind webmethod. In that webmethod i do a HttpWebRequest to a third party web api service that returns json. Even though the httpwebrequest works fine, a popup appears in the browser asking me to enter credentials (authentication required). On my machine this works well, however when deployed it doesn't except if there is no data returned from the httpwebrequest call.

jquery调用:

function serverCall(httpMethod, pageName, methodName, inputData, successCallback, errorCallback, disableGlobalAjaxEvents) {

    // Construct the url
    var url = pageName + "/" + methodName;    

    var triggerGlobalEvents = true;
    if (disableGlobalAjaxEvents && disableGlobalAjaxEvents == true) {
        triggerGlobalEvents = false;
    }

    $.ajax({
        type: httpMethod,
        url: url,
        data: JSON.stringify(inputData),
        contentType: "application/json; charset=utf-8",
        global: triggerGlobalEvents,
        dataType: "json",
        success: function(msg) {
            if (successCallback) {

                var parsedObject = JSON.parse(msg.d);
                successCallback(parsedObject);
            }
        },
        error: function(error, status) {
            if (errorCallback) {
                errorCallback(error, status);
            }
        }
    });

这是实际的通话:

serverCall("POST", "SomePage.aspx", "GetSomething", inpuData, onSuccess, onError, true);

网络方法:

       [WebMethod(
          CacheDuration = 5,
          EnableSession = true)]
        public static string GetSomething(string user, string item)
{
// In the body i do the HTTPWebRequest that returns JSON
}