class Protocol::Rack::Adapter::Generic

def unwrap_request(request, env)

@parameter env [Hash] The rack `env`.
@parameter request [Protocol::HTTP::Request] The incoming request.

- Set `env['REMOTE_ADDR']` to the request remote adress.
- Set the `env['HTTP_X_FORWARDED_PROTO']` header to the request scheme.
- Set the `env['HTTP_HOST']` header to the request authority.
- Set the `env['CONTENT_TYPE']` and `env['CONTENT_LENGTH']` based on the incoming request body.

Process the incoming request into a valid rack `env`. 
def unwrap_request(request, env)
	# The request protocol, either from the upgrade header or the HTTP/2 pseudo header of the same name.
	if protocol = request.protocol
		env[RACK_PROTOCOL] = protocol
	end
	
	if content_type = request.headers.delete("content-type")
		env[CGI::CONTENT_TYPE] = content_type
	end
	
	# In some situations we don't know the content length, e.g. when using chunked encoding, or when decompressing the body.
	if body = request.body and length = body.length
		env[CGI::CONTENT_LENGTH] = length.to_s
	end
	
	self.unwrap_headers(request.headers, env)
	
	# For the sake of compatibility, we set the `HTTP_UPGRADE` header to the requested protocol.
	if protocol = request.protocol and request.version.start_with?("HTTP/1")
		env[CGI::HTTP_UPGRADE] = Array(protocol).join(",")
	end
	
	if request.respond_to?(:hijack?) and request.hijack?
		env[RACK_IS_HIJACK] = true
		env[RACK_HIJACK] = proc{request.hijack!.io.dup}
	end
	
	# HTTP/2 prefers `:authority` over `host`, so we do this for backwards compatibility.
	env[CGI::HTTP_HOST] ||= request.authority
				
	if peer = request.peer
		env[CGI::REMOTE_ADDR] = peer.ip_address
	end
end