From 4f3131547d9af5676b745de823e2ca7ea159f5f1 Mon Sep 17 00:00:00 2001
From: BaiZe1998 <1157467179@qq.com>
Date: Sat, 18 Jan 2025 00:13:51 +0800
Subject: [PATCH] fix: len(buf) => cap(buf)

---
 server.go | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/server.go b/server.go
index 02ea01fd..d2d0eac3 100644
--- a/server.go
+++ b/server.go
@@ -205,7 +205,7 @@ func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeade
 	buf := brw.Writer.AvailableBuffer()
 
 	var writeBuf []byte
-	if u.WriteBufferPool == nil && u.WriteBufferSize == 0 && len(buf) >= maxFrameHeaderSize+256 {
+	if u.WriteBufferPool == nil && u.WriteBufferSize == 0 && cap(buf) >= maxFrameHeaderSize+256 {
 		// Reuse hijacked write buffer as connection buffer.
 		writeBuf = buf
 	}
@@ -370,4 +370,3 @@ func (b *brNetConn) Read(p []byte) (n int, err error) {
 func (b *brNetConn) NetConn() net.Conn {
 	return b.Conn
 }
-