API response header content-type is text/html which is refused by NzbDrone

[RandomUser99]

As per the thread on the NzbDrone support forums http://forums.nzbdrone.com/t/trouble-scraping-nzbmegasearch-indexer/2188

Upon inspecting the response headers from an API query, the content-type is "text/html" instead of the correct content-type for RSS which is "application/rss+xml".

Since the 2.0.0.2046 release of NzbDrone, it now refuses to accept incorrect content-type response
headers, rending the NzbMegaSearch API useless to it.