With the new upgrade to 1.5, the XMLHttpRequest has been wrapped with a new JQuery object (jqXHR).

In IE (IE7 for sure) if a response header is returned with only a key, and no value, the new upgrade takes the next key/value pair and uses that for its value.

Example of a response header:

Key-1:

Key-2: Testing

Key-3: Testing 2

In IE7, if the we call the request header

var value1 = jqXHR.getResponseHeader("Key-1");

var value2 = jqXHR.getResponseHeader("Key-2");

var value3 = jqXHR.getResponseHeader("Key-3");

value1's value will actually be "Key-2: Testing".

value2 will be empty or null.

value3's value will be "Testing 2"

This is a fairly large defect.