Ignore reserved headers in blueprint file

[subinvarghesein]

According to W3C, following headers are reserved and can't be explicitly set by JS:

• header name starting with Proxy- or Sec-
• Accept-Charset
• Accept-Encoding
• Access-Control-Request-Headers
• Access-Control-Request-Method
• Connection
• Content-Length
• Cookie
• Cookie2
• Date
• DNT
• Expect
• Host
• Keep-Alive
• Origin
• Referer
• TE
• Trailer
• Transfer-Encoding
• Upgrade
• User-Agent
• Via

So if a blueprint spec has mentioned one of the above headers, Drakov should ideally ignore that in it's url matching algorithm.