jquery.ajax() POST receives empty response with IE10 on Nginx/PHP-FPM but works on Apache - apache

Question

I use a very simple jquery.ajax() call to fetch some HTML snippet from a server:
// Init add lines button
$('body').on('click', '.add-lines', function(e) {
$.ajax({
type : 'POST',
url : $(this).attr('href')+'?ajax=1&addlines=1',
data : $('#quickorder').serialize(),
success : function(data,x,y) {
$('#directorderform').replaceWith(data);
},
dataType : 'html'
});
e.preventDefault();
});
On the PHP side i basically echo out a HTML string. The jQuery version is 1.8.3.
The problem is in IE10: While it works fine there on Server A which runs on Apache it fails on Server B which runs on Nginx + PHP-FPM: If i debug the success handler on Server B I get a undefined for data. In the Network tab of the IE developer tools I can see the full response and all headers. It may affect other IE versions, but i could only test IE10 so far.
Here are the two response headers:
Server A, Apache (works):
HTTP/1.1 200 OK
Date: Thu, 25 Apr 2013 13:28:08 GMT
Server: Apache
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Vary: Accept-Encoding,User-Agent
Content-Encoding: gzip
Content-Length: 1268
Keep-Alive: timeout=2, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8
Server B, Nginx + PHP-FPM (fails):
HTTP/1.1 200 OK
Server: nginx/1.1.19
Date: Thu, 25 Apr 2013 13:41:43 GMT
Content-Type: text/html; charset=utf8
Transfer-Encoding: chunked
Connection: keep-alive
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Encoding: gzip
The body part looks the same in both cases.
Any idea what could cause this issue?

Answer 1

Please also check the Content-Type Header, since Apache and Nginx are sending different values:
Content-Type: text/html; charset=UTF-8
vs.
Content-Type: text/html; charset=utf8
Update your Nginx config, add this line:
charset UTF-8;