I've been having issues with blank pages being returned from some sites that make use of CloudFlare. I've contacted CloudFlare and they say it is most likely Sky that is causing the problem with their Transparent proxy.

See HTTP response headers from an example response where this happened:

HTTP/1.0 200 OK
Server: cloudflare-nginx
Date: Thu, 05 Dec 2013 22:15:40 GMT
Content-Type: text/html; charset=utf-8
Content-Encoding: gzip
X-Cache: MISS from in0.pi0.enlba.isp.sky.com
X-Cache-Lookup: MISS from in0.pi0.enlba.isp.sky.com:3128
Via: 1.1 in0.pi0.enlba.isp.sky.com:3128 (squid/2.7.STABLE9)
Connection: close

Note the bold lines that are exposing the transparent proxy being present, not sure if Sky actually intended for it to be exposed or not.

Anyone else having similar issues with requests being successful but a blank page being returned?