'XML5619: Incorrect document syntax. ' error in IE10 Only

Question

I\'ve been noticing during some IE10 testing that I keep running into the following error:

XML5619: Incorrect document syntax. 

However, I\'m n

Answer 1

XML5619: Incorrect document syntax.

Above issue throws in IE because the Content-Type wont be there in the response header. To cross check the same, Open Developer Tools >Network check Content-Type for the request that will be black. IE expect Content-Type for every response data. To solve this issue set the content type for the response