fiorix/cyclone — pull request #119 by mksh (2013-11-20 16:53:39+00:00)
Title: Send proper content type header in jsonrpc client

http://www.jsonrpc.org/historical/json-rpc-over-http.html#http-header
Despite this specification is a draft, many existing implementations rely on it.
In my case rpc4django (package which implements jsonrpc and xmlrpc for Django web framework) was poisoning Sentry with warnings without this header.