AJAX :: ContentType Header Attribute Occasionally Not Present In Web Method

Jul 23, 2010

I am having a simple web service method which returns JSON serialized response. The attribute to web method is

[WebMethod, ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]

As security of the return data is not a problem, I am Get enabling the HTTP response. On the client (browser) end, my code is as below

[Code]....

Everything works smoothly but occasionally on the web server's event viewer, I see the following error

"Request format is unrecognised for URL unexpectedly ending in /SomeWebServiceWebMethod"

After fiddling through the request headers using Fiddler, I figured out that if I make direct request to the webservice link, contentType header attribute is missing and that is what throws the error. There is a good post by scott guthrie explaining this. I am not able to replicate the issue and not sure what removes the contentType attribute from the request header occasionally.

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