context_header.go
func (c headerCtx) SetResponseHeaders(headers map[string]string) {
	if h := c.headers(); h != nil {
		h.respHeaders = headers
		return
	}
	panic("SetResponseHeaders called on ContextWithHeaders not created via WrapWithHeaders")
}
func (c headerCtx) SetResponseHeaders(headers map[string]string) {
	if h := c.headers(); h != nil {
		h.respHeaders = headers
		return
	}
	panic("SetResponseHeaders called on ContextWithHeaders not created via WrapWithHeaders")
}
// SetResponseHeaders sets the response headers.