$response = wp_remote_post( $url, array(

    'method'      => 'POST',

    'timeout'     => 45,

    'redirection' => 5,

    'httpversion' => '1.0',

    'blocking'    => true,

    'headers'     => array(),

    'body'        => array(

        'username' => 'bob',

        'password' => '1234xyz'

    ),

    'cookies'     => array()

    )

);

​

if ( is_wp_error( $response ) ) {

    $error_message = $response->get_error_message();

    echo "Something went wrong: $error_message";

} else {

    echo 'Response:<pre>';

    print_r( $response );

    echo '</pre>';

}