keep-alive | 易学教程

HttpsUrlConnection and keep-alive

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I am using com.sun.net.httpserver.HttpsServer in my current project which deals with client-authentification etc.. Currently it only prints out the clients address/port, so that I can check if one TCP-connection is used for multiple requests ( keep-alive ) or if a new connection is established for every request (and thus a new SSL-handshake is made every time). When I use FireFox to make multiple request against the server I can see that keep-alive is working. So the server part works fine with GET and POST-requests. If I use HttpURLConnection to make a request against the Server (in this case

TCP Keep Alive on idHttpServer (server) and wininet (client)

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问题 I have a webserver application developed using idHttpServer. When a client connects do my webserver and, for some unknown reason, got disconnect (not a gracefully disconnect) my webserver does not get notified. I know this is the normal behavior but I need to know when the client dies. There are a few ways of doing this. I know 2 good ways: 1 - Implement a heart beat mechanism. The client socket notifies the server that it is still alive (need some work and some code to make it works) 2 - TCP

http keep-alive in the modern age

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So according to the haproxy author, who knows a thing or two about http: Keep-alive was invented to reduce CPU usage on servers when CPUs were 100 times slower. But what is not said is that persistent connections consume a lot of memory while not being usable by anybody except the client who openned them. Today in 2009, CPUs are very cheap and memory is still limited to a few gigabytes by the architecture or the price. If a site needs keep-alive, there is a real problem. Highly loaded sites often disable keep-alive to support the maximum number of simultaneous clients. The real downside of not

Keeping a socket connection alive in iOS

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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.inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [self.outputStream

WCF wsHttpBinding with http keepalive

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I have a WCF client which uses a wsHttpBinding, I would like to enable http keep-alive. I'm hoping I can turn this on by just changing the client config... I've found plenty of descriptions of how to turn on keep-alives for a basicHttp binding, but no luck with wsHttpBinding... is this possible? Many thanks. Here's my client binding: <wsHttpBinding> <binding name="WSHttpBinding_IRepositoryService" closeTimeout="00:00:10" openTimeout="00:00:10" receiveTimeout="00:05:00" sendTimeout="00:05:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard"

【Vue实例生命周期】

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目录实例创建之前执行——beforeCreate 实例创建之后执行——created 挂载之前执行——beforeMount 挂载之后执行——mounted 数据更新之前执行——beforeUpdate 数据更新之后执行——updated 实例销毁之前执行——beforeDestroy 实例销毁之后执行——destroyed keep-alive组件激活时执行——activated keep-alive组件停用时执行——deactivated "有时候，我们需要在实例创建过程中进行一些初始化的工作，以帮助我们完成项目中更复杂更丰富的需求开发，针对这样的需求，Vu e提供给我们一系列的钩子函数。本文将详细介绍Vue实例在创建和销毁的过程中我们可以使用的钩子函数。这是官方文档提供的Vue实例生命周期图，我们结合这张图来进行钩子函数的解析。 @ *** 实例创建之前执行——beforeCreate ==除标签外，所有的vue需要的数据(data)、事件(methods)、标签(el)都不存在.== <body> <div id="app"> {{ name }} <button @click="myClick">点击修改数据</button> </div> <script> new Vue({ el: '#app', data: { name: 'zyk', }, methods:

HTTP keep-alive in node.js

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问题 I am trying to set-up a HTTP client to keep the underlying connection open (keep-alive) in node.js, but it seems that the behaviour does not correspond to the docs (http://nodejs.org/api/http.html#http_class_http_agent). I am creating a new HTTP agent, setting the maxSockets property to 1 and requesting an url (for instance http://www.twilio.com/ ) every second. It seems that on every request the socket is closed and a new socket is created. I have tested this with node.js 0.10.25 and 0.10.36

Does WebClient use KeepAlive?

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问题 I need to issue around 50 HTTP requests to a single host (API calls). Performance is important, so I'd like to use HTTP KeepAlive's. Does WebClient support this? 回答1: It does on my machine, but I can't see that it's documented to. I'd certainly expect it to by default. The simplest way to tell is to run Wireshark (or Fiddler) and look at exactly what's going down the wire. For example, this program: using System; using System.Net; class Test { static void Main() { WebClient client = new

How to send lower-case Keep-Alive header through HttpWebRequest

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问题 I'm writing a bot, which should emulate firefox as closely as possible. By examining the headers that it is sending, I've found one minor difference, that I do not know how to get rid off: Firefox uses following keep-alive header: Connection: keep-alive While c# always sends out: Connection: Keep-Alive I know that it probably does not matter, but I'd still love to know if there is any way/hack to modify that header to be all lower case. Any ideas how to do this? 回答1: In .net 4.0 this works:

HTTP library for Ruby with HTTPS, SSL Client Certificate and Keep-Alive support?

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问题 I'm trying to write an HTTPS client in Ruby. It will connect to the server using HTTPS, passing an authentication token (obtained through a separate login process) and an SSL client certificate. I'm doing the following with rest-client: client = RestClient::Resource.new(url, :ssl_client_cert => OpenSSL::X509::Certificate.new(File.read('./certificate/client-2048.pem')), :ssl_client_key => OpenSSL::PKey::RSA.new(File.read('./certificate/client-2048.key'), ''), :verify_ssl => OpenSSL::SSL: