CORS Access-Control-Allow-Origin despite correct headers

Question

I am trying to set up simple Cross-Origin Resource Sharing using jQuery (1.7.1) powered ajax on the client and apache served python (django) server. According to all the in

Answer 1

I was using the excellent django-cors-headers library and ran into this problem as well. For me, the solution was to add 'accept-encoding' to the default CORS_ALLOW_HEADERS tuple.