if z.compressor != nil {
		z.compressor.Reset(w)
	}
	if z.digest != nil {
		z.digest.Reset()
	}
	z.err = nil
	z.scratch = [4]byte{}
	z.wroteHeader = false
}

// writeHeader writes the ZLIB header.
func (z *Writer) writeHeader() (err error) {
	z.wroteHeader = true
	// ZLIB has a two-byte header (as documented in RFC 1950).

	return pr.res.Header
}

func (pr *populateResponse) WriteHeader(code int) {
	if pr.wroteHeader {
		return
	}
	pr.wroteHeader = true

	pr.res.StatusCode = code
	pr.res.Status = fmt.Sprintf("%d %s", code, StatusText(code))
}

func (pr *populateResponse) Write(p []byte) (n int, err error) {
	if !pr.wroteHeader {
		pr.WriteHeader(StatusOK)
	}
	pr.hasContent = true
	if !pr.sentResponse {

	tw.w.(http.Flusher).Flush()
}

func (tw *baseTimeoutWriter) WriteHeader(code int) {
	tw.mu.Lock()
	defer tw.mu.Unlock()

	if tw.timedOut || tw.wroteHeader || tw.hijacked {
		return
	}

	copyHeaders(tw.w.Header(), tw.handlerHeaders)
	tw.wroteHeader = true
	tw.w.WriteHeader(code)
}

func copyHeaders(dst, src http.Header) {
	for k, v := range src {
		dst[k] = v

	header         http.Header
	code           int
	wroteHeader    bool
	wroteCGIHeader bool
	bufw           *bufio.Writer
}

func (r *response) Flush() {
	r.bufw.Flush()
}

func (r *response) Header() http.Header {
	return r.header
}

func (r *response) Write(p []byte) (n int, err error) {
	if !r.wroteHeader {
		r.WriteHeader(http.StatusOK)
	}
	if !r.wroteCGIHeader {

	// early. (We can't return an error from WriteHeader even if we wanted to.)
	if code < 100 || code > 999 {
		panic(fmt.Sprintf("invalid WriteHeader code %v", code))
	}
}

// WriteHeader implements [http.ResponseWriter].
func (rw *ResponseRecorder) WriteHeader(code int) {
	if rw.wroteHeader {
		return
	}

	checkWriteHeaderCode(code)
	rw.Code = code
	rw.wroteHeader = true
	if rw.HeaderMap == nil {

	return r.header
}

func (r *response) Write(p []byte) (n int, err error) {
	if !r.wroteHeader {
		r.WriteHeader(http.StatusOK)
	}
	if !r.wroteCGIHeader {
		r.writeCGIHeader(p)
	}
	return r.w.Write(p)
}

func (r *response) WriteHeader(code int) {
	if r.wroteHeader {
		return
	}
	r.wroteHeader = true
	r.code = code
	if code == http.StatusNotModified {
		// Must not have body.

	body        *bytes.Buffer
	header      map[string]string
	wroteHeader bool
}

func (r ResponseCapture) Header() http.Header {
	header := make(http.Header)
	for k, v := range r.header {
		header.Set(k, v)
	}
	return header
}

func (r ResponseCapture) Write(i []byte) (int, error) {
	return r.body.Write(i)
}

func (r ResponseCapture) WriteHeader(statusCode int) {
	r.header["statusCode"] = strconv.Itoa(statusCode)

func (z *Writer) Write(p []byte) (int, error) {
	if z.err != nil {
		return 0, z.err
	}
	var n int
	// Write the GZIP header lazily.
	if !z.wroteHeader {
		z.wroteHeader = true
		z.buf = [10]byte{0: gzipID1, 1: gzipID2, 2: gzipDeflate}
		if z.Extra != nil {
			z.buf[3] |= 0x04
		}
		if z.Name != "" {
			z.buf[3] |= 0x08
		}
		if z.Comment != "" {

	// at the time of res.writeHeader, if res.writeHeader is
	// called and extra buffering is being done to calculate
	// Content-Type and/or Content-Length.
	header Header

	// wroteHeader tells whether the header's been written to "the
	// wire" (or rather: w.conn.buf). this is unlike
	// (*response).wroteHeader, which tells only whether it was
	// logically written.
	wroteHeader bool

	http.ResponseWriter

	status      int
	written     int64
	wroteHeader bool
}

func (r *ResponseWriterDelegator) Unwrap() http.ResponseWriter {
	return r.ResponseWriter
}

func (r *ResponseWriterDelegator) WriteHeader(code int) {
	r.status = code
	r.wroteHeader = true
	r.ResponseWriter.WriteHeader(code)
}

func (r *ResponseWriterDelegator) Write(b []byte) (int, error) {