';':  true, // sub-delims
	'=':  true, // sub-delims
	'[':  true,
	'\'': true, // sub-delims
	']':  true,
	'_':  true, // unreserved
	'~':  true, // unreserved
}

// ValidHeaderFieldValue reports whether v is a valid "field-value" according to
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2 :
//
//	message-header = field-name ":" [ field-value ]

func validateHeaders(hdrs Header) string {
	for k, vv := range hdrs {
		if !httpguts.ValidHeaderFieldName(k) {
			return fmt.Sprintf("field name %q", k)
		}
		for _, v := range vv {
			if !httpguts.ValidHeaderFieldValue(v) {
				// Don't include the value in the error,
				// because it may be sensitive.
				return fmt.Sprintf("field value for %q", k)
			}
		}
	}
	return ""
}

	hdec.SetEmitFunc(func(hf hpack.HeaderField) {
		if http2VerboseLogs && fr.logReads {
			fr.debugReadLoggerf("http2: decoded hpack field %+v", hf)
		}
		if !httpguts.ValidHeaderFieldValue(hf.Value) {
			// Don't include the value in the error, because it may be sensitive.
			invalid = http2headerFieldValueError(hf.Name)
		}
		isPseudo := strings.HasPrefix(hf.Name, ":")
		if isPseudo {

	}
	for k, vv := range req.Header {
		if !httpguts.ValidHeaderFieldName(k) {
			return nil, badRequestError("invalid header name")
		}
		for _, v := range vv {
			if !httpguts.ValidHeaderFieldValue(v) {
				return nil, badRequestError("invalid header value")
			}
		}
	}
	delete(req.Header, "Host")

	ctx, cancelCtx := context.WithCancel(ctx)
	req.ctx = ctx