Request format is unrecognized for URL unexpectedly ending in

I have a website with a lot of traffic, and a lot of webservice calls. All of my webservices work 95% of the time, but a couple of times a day I get this error message in my log:

Request format is unrecognized for URL unexpectedly ending in '/MyWebServiceName'.

I have Googled this problem, and all I find are pages referencing this issue: Request format is unrecognized for URL unexpectedly ending in

But this does not apply to me, since my webservices do work most of the time. I already got that code in my web.config.

Anyone have any idea on what might cause this?

Info:

• Windows Server 2008.
• ASP.NET 2.0 on IIS7.
• Use jQuery to call webservices.

Code examples:

jQuery call

$.ajax({
    type: 'POST',
    contentType: 'application/json; charset=utf-8',
    url: '/MyWebServiceName',
    dataType: 'json',开发者_StackOverflow社区
    success: function(msg) {
       // On success
    },
    error: function(xhr, textStatus, errorThrown) {
       // On error
    }
});

Return from webservice:

<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/">
    [{"ID":"GB","Name":"Great Britain"},{"ID":"IT","Name":"Italy"},{"ID":"DE","Name":"Germany"}] 
</string>

When I call the webservice through my browser I do get data back (look above), but I wonder why it sometimes fails.

---

You have dataType: 'json' but the webservice respones as xml.