keep-alive

Keeping a socket connection alive in iOS

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问题 I have the following code written in Objective-C that writes data to a socket. The server is running node.js on top of Ubuntu: NSString *url = @"anIPAddress"; CFReadStreamRef readStream; CFWriteStreamRef writeStream; CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)url, 9000, &readStream, &writeStream); self.inputStream = (NSInputStream *)readStream; self.outputStream = (NSOutputStream *)writeStream; [self.inputStream setDelegate:self]; [self.outputStream setDelegate:self]; [self

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然后每次切换路由的时候，尽量避免不要重复请求数据，所以我们还需要配置一下组件的 keep-alive . <keep-alive exclude="moviesDetail"> <router-view></router-view> </keep-alive> exclude="moviesDetail" 除了电影详情页不需要保存原有的数据外，即重新拉取数据。其他的界面都缓存原有的数据。来源： https://www.cnblogs.com/lvonve/p/11334687.html

Connection: Keep-Alive

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上午在实验室看书，师弟让我帮忙解决个项目上的问题，问题不难，于是我教他抓包解决，让他电脑下了fiddler不过却显示不出来请求，我尝试了一下也是如此，过滤器也没开，突然意识到可能是360的问题，因为fiddler是通过http代理的方式，360很可能阻止第三方软件对浏览器代理，于是关掉360,重启浏览器终于能愉快的抓包了。调试过程中我让他F12勾上disable cache，然后眼睛被一个词语吸引住了---Connection: Keep-Alive 当时很疑惑，http明明是无连接无状态的，那么这里的keepalive是指什么？实际上它是一种TCP复用，每次http请求都需要tcp三次握手，浪费资源和时间，因此我们可以保持tcp通道连接一段时间，这样一次tcp连接就可以维持几次http请求。在此基础上，还需要搞清楚几个其他的名词：长轮询，段轮询长连接是为了tcp复用，那么这两个词是做什么的呢？先说个例子：短轮询相信大家都不难理解，比如你现在要做一个电商中商品详情的页面，这个详情界面中有一个字段是库存量（相信这个大家都不陌生，随便打开淘宝或者京东都能找到这种页面）。而这个库存量需要实时的变化，保持和服务器里实际的库存一致，怎么实现？长轮询这个时候就出现了，其实长轮询和短轮询最大的区别是，短轮询去服务端查询的时候，不管库存量有没有变化，服务器就立即返回结果了

How do I shutdown a Node.js http(s) server immediately?

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I have a Node.js application that contains an http(s) server. In a specific case, I need to shutdown this server programmatically. What I am currently doing is calling its close() function, but this does not help, as it waits for any kept alive connections to finish first. So, basically, this shutdowns the server, but only after a minimum wait time of 120 seconds. But I want the server to shutdown immediately - even if this means breaking up with currently handled requests. What I can not do is a simple process.exit(); as the server is only part of the application, and the rest of the

How does Keep-alive work with ThreadPoolExecutor?

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问题 In continuation to a question posted by me, I'm trying to use ThreadPoolExecutor in my codebase. Even after repeated attempts to comprehend from Java API doc, I failed to understand clearly the functionality/purpose behind keepAliveTime parameter to be passed in the constructor. Hope somebody can explain me with some good working example. Excerpts from Java doc: public ThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable>

How to set the HTTP Keep-Alive timeout in a nodejs server

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问题 I'm actually doing some load testing against an ExpressJS server, and I noticed that the response send by the server includes a "Connection: Keep-Alive" header. As far as I understand it, the connection will remain opened until the server or the client sends a "Connection: Close" header. In some implementations, the "Connection: Keep-Alive" header comes up with a "Keep-Alive" header setting the connection timeout and the maximum number of consecutive requests send via this connection. For

Express.js close response

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问题 Is there a way to close a response? I can use res.end() but it doesn't actually close the socket. What I want to achieve: I am writing a Java program which interfaces with the network, and I am writing a node.js server for this. Java code: String line; while((line = in.readLine()) != null) { System.out.println("RES: "+line); } But this just keeps hanging.. No end connection, still waiting for input from the socket. Node: exports.getAll = function (req, res) { res.set("Content-Type", "text

How to change tcp keepalive timer using python script?

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问题 In my python script, I have activate TCP Keepalive using this command: x = s.setsockopt( socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1) My goal is for socket connection to get closed, if there is no transmission(*) for 5 minutes. I am working on Windows and my python script is only receiving and not transmitting any data to client program. What I know is, by default, if no transmission will be there for 2 hours, then only I can close the connection using try and except. I know, for windows, I can

Simple comet example using php and jquery

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问题 Can anyone give me a good and simple example of the comet technique using PHP? I just need an example that uses a persistent HTTP connection or something similar. I don\'t want to use a polling technique, because I have something like that set up and not only is it difficult to work with and manage its a big hog of resources. Also I am using IIS7 not Apache. A good example would be really helpful so I can move on from this ugly polling technique. 回答1: You should use polling, or use a web

Keep-alive header clarification

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问题 I was asked to build a site , and one of the co-developer told me That I would need to include the keep-alive header. Well I read alot about it and still I have questions. msdn -> The open connection improves performance when a client makes multiple requests for Web page content, because the server can return the content for each request more quickly. Otherwise, the server has to open a new connection for every request Looking at When The IIS (F) sends keep alive header ( or user sends keep