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

Tests which transports are capable of supporting the request.


$args array Required
Request arguments.
$url string Optional
URL to request.

Default: null

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

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File: wp-includes/class-wp-http.php. View all references

public function _get_first_available_transport( $args, $url = null ) {
	$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;

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Version Description
3.2.0 Introduced.

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