TUN-2776: Add header serialization feature in cloudflared

connection/features.go

@@ -0,0 +1,9 @@
+package connection
+
+const (
+	FEATURE_SERIALIZED_HEADERS = "serialized_headers"
+)
+
+var SUPPORTED_FEATURES = []string{
+	//FEATURE_SERIALIZED_HEADERS,
+}

origin/tunnel.go

@@ -161,6 +161,7 @@ func (c *TunnelConfig) RegistrationOptions(connectionID uint8, OriginLocalIP str
 		RunFromTerminal:      c.RunFromTerminal,
 		CompressionQuality:   c.CompressionQuality,
 		UUID:                 uuid.String(),
+		Features:             connection.SUPPORTED_FEATURES,
 	}
 }
 

tunnelrpc/pogs/tunnelrpc.go

@@ -168,6 +168,7 @@ type RegistrationOptions struct {
 	CompressionQuality   uint64 `capnp:"compressionQuality"`
 	UUID                 string `capnp:"uuid"`
 	NumPreviousAttempts  uint8
+	Features             []string
 }
 
 func MarshalRegistrationOptions(s tunnelrpc.RegistrationOptions, p *RegistrationOptions) error {