Как я понимаю это способ избавиться от недостатков в реализации XMLHTTPRequest - сброс/очистка устаревшего содержимого в response?

Можно в принципи вообще не разрывать связь, а складывать все в response и при поступлении данных их обрабатывать... ну допустим если у нас "своя сеть", а для сброса переподключаться к серверу.

а можно привести пример такого запроса?
желательно на примере чата))

И сколько в среднем длится простой соединения, пока сервер его не закрывает?
и что в течении этого времени предлагается делать? циклически проверять наличие обновлений? какой же сервер это выдержит (при чате с 50-100 посетителями онлайн)?

А можете всё же пример написать, так проще для понимания...

Нужен пример!

Илья Кантор пожалуйста приведите пример!

можете описать вот этот момент серверного скрипта

Соединение не закрывается сервером

* пока не появится событие
И в чем тогда разница этого метода от частых опросов если каждые 20-30 секунд посылается новый xmlhttprequest?

Илья, спасибо все теперь понятно. Вы тут в комментариях писали (Если идет активный чат с кучей сообщений, то такой способ не очень хорош, а если чат двусторонний, или просто получение событий с сервера - он работает замечательно.)
Что то я тут не понял разницу чата с кучей сообщений и двусторонним чатом. Могли бы вы по подробнее описать этот момент?

Илья, Вы на мастер классах говорили, что timeout может быть сколько угодно по времени, даже несколько часов.
Здесь Вы пишете про 30 секунд.

Я сам пробовал на чате написанном на nodeJS сделать timeout больше 30 секунд - не вышло.
Вот пример чата от разработчика nodeJS http://chat.nodejs.org/
В нем тоже timeout 30 секунд.

Возможно я Вас неправильно понял, Вы наверное имели в виду Socket.io - да
там есть возможность держать соединение по времени столько сколько нужно.

Написано:

2. Соединение не закрывается сервером
пока не появится событие

Непонятно как завершить соединение с сервером при закрытии страницы. У меня продолжает висеть соединение после закрытия страницы. Разрывать соединение обязатетьно по таймауту или есть другие способы?

Здравствуйте,

для меня не совсем понятен вопрос с сервером. в чём разница с простым AJAX запросом? толко в том что мы тянем время за которое будет возможность получить эти данные? По сути когда запрос выполняется, то скрип так-же завершается и при новом запуске всё идёт по новой? а как быть если мы пишем свой демон на C++, то мы должны плодить под каждого пользователя поток в котором будет висеть заблокировнное соединение до момента отправки данных или разрыва?

Данный способ отлично подходит если необходимо наиболее скорейшее получение события с сервера. При обычном AJAX мы долбим сервер каждые 5-10 секунд. В таком случает если событие произошло в 1-ую секунду после запросы то клиент получит событие только через 4-9 секунд, а ведь в некоторых приложениях это большая задержка (чаты). А в случает с лонг поллингом задержка будет только в момент создания нового соединения что в худшем случает составляет 1-2 секунды а обычно на много меньше, а к тому же это только в том случает если событие произошло в момент создания нового соединения а шанс что это произойдет очень мал

Добрый вечер. Хотел было воспользоваться данной технологией. Но на одном из форумов мне сообщили о том, будто Long poll съедает много ресурсов сервера. Так ли это?

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