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`) type SniffConn struct { net.Conn rout io.Reader peeked, read bool Type int preData []byte path string } const ( TypeHttp = iota TypeHttp2 TypeUnknown ) var ( httpMethods = [...][]byte{ []byte("GET"), []byte("POST"), []byte("HEAD"), []byte("PUT"), []byte("DELETE"), []byte("OPTIONS"), []byte("CONNECT"), } http2Header = []byte("PRI * HTTP/2.0") sep = []byte(" ") ) func NewPeekPreDataConn(c net.Conn) *SniffConn { s := &SniffConn{Conn: c, rout: c} s.Type = s.sniff() return s } func (c *SniffConn) peekPreData(n int) ([]byte, error) { if c.read { return nil, errors.New("pre-data must be peek before read") } if c.peeked { return nil, errors.New("can only peek once") } c.peeked = true preDate := make([]byte, n) n, err := c.Conn.Read(preDate) return preDate[:n], err } func (c *SniffConn) Read(p []byte) (int, error) { if !c.read { c.read = true c.rout = io.MultiReader(bytes.NewReader(c.preData), c.Conn) } return c.rout.Read(p) } func (c *SniffConn) sniff() int { var err error c.preData, err = c.peekPreData(64) if err != nil && err != io.EOF { return TypeUnknown } if c.sniffHttp() { return TypeHttp } if c.sniffHttp2() { return TypeHttp2 } return TypeUnknown } func (c *SniffConn) sniffHttp() bool { preDataParts := bytes.Split(c.preData, sep) if len(preDataParts) < 2 { return false } for _, m := range httpMethods { if bytes.Compare(preDataParts[0], m) == 0 { c.path = string(preDataParts[1]) return true } } return false } func (c *SniffConn) sniffHttp2() bool { return len(c.preData) >= len(http2Header) && bytes.Compare(c.preData[:len(http2Header)], http2Header) == 0 } func (c *SniffConn) SetPath(path string) { preDataParts := bytes.Split(c.preData, sep) preDataParts[1] = []byte(path) c.preData = bytes.Join(preDataParts, sep) c.path = path } func (c *SniffConn) GetPath() string { return c.path } func (c *SniffConn) Handle() bool { write, err := c.Write(defaultHttpResponse) if err != nil { return false } return write > 0 }