Improve ResourceLocation API, allow proxy to use authenticated transport

pkg/util/httpstream/httpstream.go

@@ -19,6 +19,7 @@ package httpstream
 import (
 	"io"
 	"net/http"
+	"strings"
 	"time"
 )
 
@@ -78,3 +79,13 @@ type Stream interface {
 	// Headers returns the headers used to create the stream.
 	Headers() http.Header
 }
+
+// IsUpgradeRequest returns true if the given request is a connection upgrade request
+func IsUpgradeRequest(req *http.Request) bool {
+	for _, h := range req.Header[http.CanonicalHeaderKey(HeaderConnection)] {
+		if strings.Contains(strings.ToLower(h), strings.ToLower(HeaderUpgrade)) {
+			return true
+		}
+	}
+	return false
+}