The Problem: I send GET or POST request with jQuery.ajax and get an error handler triggered with 404. The thing is, I have used a sniffer to check an answer from server and it is a valid 200 response with a correct JSON (returned by Python json.dumps). And something weird: after this call ends up with 404 a browser reloads the page.
Everything lives in the same domain (and subdomain too).
jQuery call:
$.ajax({type: "POST", url: "/m/auth/login", data: {x: "y"},
success: function(result) {}, error: function(xhr) {}, dataType: "json"});
Response as seen by sniffer with payload decompressed:
HTTP/1.1 200 OK\r\n
Content-Type: text/html; charset=utf-8\r\n
Cache-Control: no-cache, must-revalidate\r\n
Content-Encoding: gzip\r\n
X-AppEngine-Estimated-CPM-US-Dollars: $0.000018\r\n
X-AppEngine-Resource-Usage: ms=71 cpu_ms=0\r\n
Vary: Accept-Encoding\r\n
Date: Tue, 24 Dec 2013 21:04:36 GMT\r\n
Pragma: no-cache\r\n
Expires: Fri, 01 Jan 1990 00:00:00 GMT\r\n
Server: Google Frontend\r\n
Content-Length: 80\r\n
Alternate-Protocol: 80:quic,80:quic\r\n
\r\n
{"reason": {"password": "missing", "email": "missing"}, "error": "argument"}