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The plugin allows you to put your website on the WordPress into maintenance mode.
Quoting Wikipedia:
503 Service Unavailable. The server is currently unavailable (because it is overloaded or down for maintenance). Generally, this is a temporary state.
Данный плагин позволяет вам просто и быстро перевести сайт в режим обслуживания.
Цитируя Википедию:
503 Service Unavailable — сервер временно не имеет возможности обрабатывать запросы по техническим причинам (обслуживание, перегрузка и прочее). В поле Retry-After заголовка сервер может указать время, через которое клиенту рекомендуется повторить запрос. Хотя во время перегрузки очевидным кажется сразу разрывать соединение, эффективней может оказаться установка большого значения поля Retry-After для уменьшения частоты избыточных запросов. Появился в HTTP/1.0.

My Maintenance Mode

David Gwyer

NOTE: This Plugin is still in beta. It’s recommended that you don’t run this Plugin on production sites yet, and don’t forget to backup your wp-config.php file.
WordPress constants such as WP_DEBUG can be defined in wp-config.php but have to be edited manually every time you need to make a change. But no longer! You can now edit several common wp-config.php constants directly from within the WordPress admin!
The current list of WordPress constants you can modify with Config Constants are:
<ul>
<li>WP_DEBUG</li>
<li>WP_DEBUG_LOG</li>
<li>WP_DEBUG_DISPLAY</li>
<li>SCRIPT_DEBUG</li>
<li>CONCATENATE_SCRIPTS</li>
<li>SAVEQUERIES</li>
<li>DISALLOW_FILE_MODS</li>
<li>DISALLOW_FILE_EDIT</li>
<li>WP_ALLOW_REPAIR</li>
</ul>
More constants will be supported in future versions.
If none of the above constants are defined in wp-config.php then they will be added automatically. Constants already specified in wp-config.php will have their values modified.
Also, a key feature of the Plugin is the support for two-way editing. This means you can still edit wp-config.php constants manually if you wish and your changes will be automatically synchronised with Plugin settings. Likewise, if you update the value of a constant via the Plugin options page then wp-config.php is immediately updated!
Please rate this Plugin if you find it useful. 🙂
Visit our <a href="http://www.wpgoplugins.com" rel="nofollow ugc">WordPress plugin site</a>.

Config Constants

Modify WP_DEBUG and other WordPress constants directly in the WordPress admin rather than manually editing them via wp-config.php!

My Maintenance Mode vs Config Constants