def proxy_connect_headers
      connect_headers = HTTP::Headers.coerce(
        Headers::HOST        => headers[Headers::HOST],
        Headers::USER_AGENT  => headers[Headers::USER_AGENT]
      )

      connect_headers[Headers::PROXY_AUTHORIZATION] = proxy_authorization_header if using_authenticated_proxy?
      connect_headers.merge!(proxy[:proxy_headers]) if proxy.key?(:proxy_headers)
      connect_headers
    end
def proxy_connect_headers
      connect_headers = HTTP::Headers.coerce(
        Headers::HOST        => headers[Headers::HOST],
        Headers::USER_AGENT  => headers[Headers::USER_AGENT]
      )

      connect_headers[Headers::PROXY_AUTHORIZATION] = proxy_authorization_header if using_authenticated_proxy?
      connect_headers.merge!(proxy[:proxy_headers]) if proxy.key?(:proxy_headers)
      connect_headers
    end
Headers to send with proxy connect request