panic: assignment to entry in nil map

[solo-xwz]

how to avoid this?

[8763232]

`

func (h Header) write(w io.Writer, trace *httptrace.ClientTrace) error { return h.writeSubset(w, nil, trace) exclude is nil？ }

func (h Header) writeSubset(w io.Writer, exclude map[string]bool, trace *httptrace.ClientTrace) error { ....... mutex.Lock() exclude[HeaderOrderKey] = true problem is there! exclude[PHeaderOrderKey] = true exclude[UnChangedHeaderKey] = true mutex.Unlock() ......

@wangluozhe you need fix,pls!