WP_Http::_dispatch_request( string $url, array $args )

	private function _dispatch_request( $url, $args ) {
		static $transports = array();

		$class = $this->_get_first_available_transport( $args, $url );
		if ( !$class )
			return new WP_Error( 'http_failure', __( 'There are no HTTP transports available which can complete the requested request.' ) );

		// Transport claims to support request, instantiate it and give it a whirl.
		if ( empty( $transports[$class] ) )
			$transports[$class] = new $class;

		$response = $transports[$class]->request( $url, $args );

		/** This action is documented in wp-includes/class-http.php */
		do_action( 'http_api_debug', $response, 'response', $class, $args, $url );

		if ( is_wp_error( $response ) )
			return $response;

		/**
		 * Filters the HTTP API response immediately before the response is returned.
		 *
		 * @since WP-2.9.0
		 *
		 * @param array  $response HTTP response.
		 * @param array  $args     HTTP request arguments.
		 * @param string $url      The request URL.
		 */
		return apply_filters( 'http_response', $response, $args, $url );
	}