The client code is always the same; it's the same code used in Parts 1, 2, and 3 of this series ( in the chat samples using Comet long polling).

Long polling is a polling technique in which the server will delay completing the HTTP response until either an update is ready for the client or a timeout occurs.

长轮询是一种轮询技术，其中服务器延迟完成HTTP请求，直至已经为客户机准备好了一个更新信息或发生超时。

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We are hopeful that websocket usage will be able to give us even better throughput and latency for cometd than the already impressive results achieved with long polling.

我们真心希望WebSocket可以给我们更大的吞吐量和更低的延迟，比现在已经让人印象深刻的长轮询要更好。

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On the client side, broadcasting will make all long polling requests to complete the sent message, and another long polling request is immediately sent to receive the next events.

在用户端，广播会让所有的长轮询请求来完成消息发送，并且会立即发送另一个长轮询请求来接收下一个事件。

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The clients can create topics and submit messages to them through a RESTful API, while other clients subscribe to multiple topics through HTTP long polling.

客户端可以创建主题，并通过RESTful的API向它们提交消息，而其它客户端会通过HTTP的长轮询机制（long polling）来订阅多种主题。

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This means you can give regular requests a short lifetime, but you can also extend this lifetime to several minutes for a mechanism that responds to long polling requests.

这意味着可以给常规的请求设置很短的生命周期，但是对于响应长轮询请求的机制，也可以将这个生命周期延长至几分钟。

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Long polling does exactly what it sounds like it does: It polls the server, and sometimes the response to the poll will take a long time.

长轮询的含义与它的字面意思并不完全相同：它轮询服务器，有时需要很长时间才能获得轮询的响应。

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There have been three kinds of technology programs, namely polling, long polling and streaming mode, and appears based on these programs related to development framework.

目前有三种技术方案，即轮询，长轮询和流方式，并且出现了基于这些基础框架的开发框架。

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You learned how Comet using HTTP long polling is the best way to reliably implement Reverse Ajax, since all browsers now provide support.

您应该已经了解到，使用HTTP长轮询的Comet是可靠地实现反向Ajax的最佳方式，因为现在所有浏览器都提供了这方面的支持。

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Long Polling: Also known as Asynchronous Polling, this method is a hybrid of pure server push and client pull.

长时间轮询：也就是所谓的异步轮询，这种方式是纯服务器端推送方式和客户端拉取方式的混合。

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The publish/ subscribe mechanism was discussed, along with some background on why long polling is used for Web messaging.

文中讨论了发布/订阅机制，以及将长轮询用于Web消息传递的一些幕后原因。

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With long polling, the client requests information from the server in a manner that is similar to traditional polling.

对于长轮询，客户机以与传统轮询类似的方法向服务器请求信息。

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Long polling, also known as Comet, puts the server in control, by making the client wait for responses.

Long polling也就是我们熟知的Comet，其让服务器来控制这些事，让客服端等在那里听服务器的响应。

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Part 1 introduced Reverse Ajax, polling, streaming, Comet, and long polling.

反向Ajax，第1部分：Comet简介介绍了Reverse Ajax、轮询、流、Comet和长轮询。

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The most common "true" Comet technique is a variant of polling called long polling.

最常见的“真正的”Comet技术是轮询的一种变体，即长轮询（long polling）。

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In long polling, however, a client would have an outstanding request to the server at any point of time.

然而，在长轮询中，一个客户机可能需要随时向服务器发送一个重要请求，因此，服务器再一次需要为每个客户机准备一个或多个线程。

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At this point you might be thinking that there is a major problem with both long polling and streaming.

至此，您可能会想，长轮询和流都有一个很大的问题。

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The main difference between polling and long polling is how long it takes the server to respond.

轮询与长轮询之间的主要区别在于服务器花多长的时间作出响应。

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This is similar to long polling in that there is no latency.

和长轮询一样，这种方式也没有延时。

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An alternative to this technique is long polling, which can avoid both these problems.

该技术的另一种方案就是长轮询，可以避免这两个问题。

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There are two basic types of polling channels, short and long polling.

有两种基本的轮询管道：短轮询与长轮询。

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