HTTP Error 401.3 - Unauthorized

on local - make sure IUSR has rights to folder

CORS in asp.net

<httpProtocol>
        <customHeaders>
            <add name="Access-Control-Allow-Origin" value="*" />
            <add name="Access-Control-Allow-Methods" value="GET,POST,OPTIONS" />
            <add name="Access-Control-Allow-Headers" value="Content-Type, soapaction" />
        </customHeaders>
    </httpProtocol>

even the mighty can fail

htttp 502 fiddler response from https

the router was not set up properly

fiddler can see https

HTTP 304 - visibility

You will only see on the browsers network traffic- not Fiddler

force jquery not to use cache

$.ajax({url: "url", success: Callback, cache: false});

and avoid http 304!