Summery Summery

Tests which transports are capable of supporting the request.

Syntax Syntax

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

Parameters Parameters


(Required) Request arguments.


(Optional) URL to Request.

Default value: null

Return Return

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

Source Source

File: wp-includes/class-http.php

		$transports = array( 'curl', 'streams' );

		 * Filters which HTTP transports are available and in what order.
		 * @since 3.7.0
		 * @param string[] $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, true ) ) {
				$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;


Changelog Changelog

Version Description
3.2.0 Introduced.


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