disable compression threshold

client.go

@@ -131,7 +131,7 @@ func (c *connector) request() (*http.Response, *bufio.Reader, error) {
 func (c *connector) getPermessageDeflate(extensions string) PermessageDeflate {
 	serverPD := permessageNegotiation(extensions)
 	clientPD := c.option.PermessageDeflate
-	return PermessageDeflate{
+	pd := PermessageDeflate{
 		Enabled:               clientPD.Enabled && strings.Contains(extensions, internal.PermessageDeflate),
 		Threshold:             clientPD.Threshold,
 		Level:                 clientPD.Level,
@@ -141,6 +141,8 @@ func (c *connector) getPermessageDeflate(extensions string) PermessageDeflate {
 		ServerMaxWindowBits:   serverPD.ServerMaxWindowBits,
 		ClientMaxWindowBits:   serverPD.ClientMaxWindowBits,
 	}
+	pd.setThreshold(false)
+	return pd
 }
 
 func (c *connector) handshake() (*Conn, *http.Response, error) {

option.go

@@ -160,6 +160,16 @@ type (
 	}
 )
 
+// 设置压缩阈值
+// 开启上下文接管时, 必须不论长短压缩全部消息, 否则浏览器会报错
+// when context takeover is enabled, all messages must be compressed regardless of length,
+// otherwise the browser will report an error.
+func (c *PermessageDeflate) setThreshold(isServer bool) {
+	if (isServer && c.ServerContextTakeover) || (!isServer && c.ClientContextTakeover) {
+		c.Threshold = 0
+	}
+}
+
 func (c *ServerOption) deleteProtectedHeaders() {
 	c.ResponseHeader.Del(internal.Upgrade.Key)
 	c.ResponseHeader.Del(internal.Connection.Key)

upgrader.go

@@ -107,7 +107,7 @@ func (c *Upgrader) hijack(w http.ResponseWriter) (net.Conn, *bufio.Reader, error
 func (c *Upgrader) getPermessageDeflate(extensions string) PermessageDeflate {
 	clientPD := permessageNegotiation(extensions)
 	serverPD := c.option.PermessageDeflate
-	return PermessageDeflate{
+	pd := PermessageDeflate{
 		Enabled:               serverPD.Enabled && strings.Contains(extensions, internal.PermessageDeflate),
 		Threshold:             serverPD.Threshold,
 		Level:                 serverPD.Level,
@@ -117,6 +117,8 @@ func (c *Upgrader) getPermessageDeflate(extensions string) PermessageDeflate {
 		ServerMaxWindowBits:   serverPD.ServerMaxWindowBits,
 		ClientMaxWindowBits:   serverPD.ClientMaxWindowBits,
 	}
+	pd.setThreshold(true)
+	return pd
 }
 
 // Upgrade