// Return a proxy handler that uses the desired transport, wrapped with additional proxy handling (to get URL rewriting, X-Forwarded-* headers, etc)
	return newThrottledUpgradeAwareProxyHandler(location, transport, true, false, responder), nil
}

// Support both GET and POST methods. We must support GET for browsers that want to use WebSockets.
var upgradeableMethods = []string{"GET", "POST"}