code: func (c *Network) SetExtraHTTPHeaders(headers map[string]interface{}) (*gcdmessage.ChromeResponse, error) {
  	var v NetworkSetExtraHTTPHeadersParams
  	v.Headers = headers
  	return c.SetExtraHTTPHeadersWithParams(&v)
  }
docs: // SetExtraHTTPHeaders - Specifies whether to always send extra HTTP headers with the requests from this page.
  // headers - Map with extra HTTP headers.