Hello,

The fix for ticket #4183 (between 1.3.2 and 1.4) implies that GET and HEAD ajax requests send a 'Content-Type' header when they should not, since these methods do not have a message-body.

Some servers refuse GET requests with a Content-Type header.

The problem is around line 352 in

src/ajax.js

if ( s.data || origSettings && origSettings.contentType ) {
        xhr.setRequestHeader("Content-Type", s.contentType);
}

A fix could be:

if ( (s.data && type !== "GET" && type != "HEAD") || origSettings && origSettings.contentType ) {
        xhr.setRequestHeader("Content-Type", s.contentType);
}

Best wishes,

Bruno.