WP_Http::_get_first_available_transport( array $args, string $url = null )

Tests which transports are capable of supporting the request.



(Required) Request arguments


(Optional) URL to Request

Default value: null


(string|false) Class name for the first transport that claims to support the request. False if no transport claims to support the request.


File: wp-includes/class-http.php

	public function _get_first_available_transport( $args, $url = null ) {
		$transports = array( 'curl', 'streams' );

		 * Filters which HTTP transports are available and in what order.
		 * @since WP-3.7.0
		 * @param array  $transports Array of HTTP transports to check. Default array contains
		 *                           'curl', and 'streams', in that order.
		 * @param array  $args       HTTP request arguments.
		 * @param string $url        The URL to request.
		$request_order = apply_filters( 'http_api_transports', $transports, $args, $url );

		// Loop over each transport on each HTTP request looking for one which will serve this request's needs.
		foreach ( $request_order as $transport ) {
			if ( in_array( $transport, $transports ) ) {
				$transport = ucfirst( $transport );
			$class = 'WP_Http_' . $transport;

			// Check to see if this transport is a possibility, calls the transport statically.
			if ( !call_user_func( array( $class, 'test' ), $args, $url ) )

			return $class;

		return false;


Version Description
WP-3.2.0 Introduced.