Error reading preface from client

jacob · June 23, 2016, 3:00pm

Hello Achim, welcome to the Caddy forum!

I searched around for this error, and found the relevant error in the http2 package:

bradfitz/http2/blob/master/server.go#L683

    
      
          		} else if !bytes.Equal(buf, clientPreface) {
          			errc <- fmt.Errorf("bogus greeting %q", buf)
          		} else {
          			errc <- nil
          		}
          	}()
          	timer := time.NewTimer(prefaceTimeout) // TODO: configurable on *Server?
          	defer timer.Stop()
          	select {
          	case <-timer.C:
          		return errors.New("timeout waiting for client preface")
          	case err := <-errc:
          		if err == nil {
          			sc.vlogf("client %v said hello", sc.conn.RemoteAddr())
          		}
          		return err
          	}
          }
          
          
// writeDataFromHandler writes the data described in req to stream.id.
          //

It looks like the client might not be sending a proper request. But I’m not really sure exactly.
@matt what do you think?