comet simulator

In doing a comet function, the second request is a request to get information, the program has been blockedCode:Then the third request is a request that triggers a condition in HTML and then initiates What is the reason that the third request will not be executed until the execution of the second request is completed? In doing PHP comet function encountered this problem a good pit dad .... What's the p

This article mainly describes the HTTP server push technology. Comet is a term in the world for server pushing technology. 1. Flash-based. Flash provides the xmlsocket class, which can be combined with JavaScript to implement comet. 2. Java Applet-based. This can be done, but the disadvantage is that the browser needs to install the JRE plug-in, and the applet cannot update the webpage after obtaining dat

JavaScript data push is mainly committed to WebApp online push service, do not have every time we like the server to send AJAX requests to actively push data from the server side to the local. Data Push Evolutionary history: 1. HTTP protocol simple polling, keep a link not put, or through the front-end non-stop to send the request back 2. H5 update with WebSocket greatly improve the convenience of two-way and one-way push data 3. SSE (Server-send Event): A new way for the server to push data

HTTP request header, that synchronous request how to define the request header? I was also stuck with this problem, the synchronization request can we operate the request header? I was not able to answer, in fact, the synchronous commit request can change the HTTP request header, which is the META tag of HTML, as shown in:In contrast, XMLHttpRequest is more flexible in the operation of the request header.Oh, 11:30, write not finished, had to divide the article, the next article I will continue

One: HTTP protocol with technology-long link + chunked transfer----> Reverse AjaxReverse Ajax is also known as comet, Server push, and servers push technology.Application: web chat server, Sina Weibo online chat, Google Mail web chat, all useful.Principle: Generally speaking, the characteristics of HTTP protocol, connection When is the specific time to disconnect?The server responds Content-length, and when it receives the content of the specified len

Use Mochiweb to build a Facebook-like Web Chat System Based On Comet (original)Author: Yu Chao EMAIL: yuchao86@gmail.com Facebook's web chat system is implemented using Mochiweb Based On Comet technology. Currently, HTTP is required by clients to send information to servers, and the server cannot push information to clients. For example:1. When the email server receives a new email, it reports it to the use

DOCTYPE HTML>HTML>Head>MetaCharSet= "Utf-8">Metahttp-equiv= "X-ua-compatible"content= "Ie=edge">Metacontent= "text/html; charset=utf-8"http-equiv= "Content-type">title>Comet Testtitle>Scriptsrc=".. /statics/js/jquery-1.9.1.min.js ">Script>Head>Body>Scripttype= "Text/javascript">$(function(){ functionHandleresponse (response) {$ ('#content'). Append ('' +response['msg'] + ''); } vartimestamp= 0; varURL= 'server.php'; varNoError= true; varAjax; f

Do you often reinstall your computer? Have you ever reinstalled your computer but cannot find the original driver?Program? Now, with this "Comet driver backup expert", you can stay away from computer reinstallation and cannot find the driver's erdream. Function introduction:1. Collect all the hardware drivers in the system, including the Microsoft drivers built into windows.2. Back up all hardware drivers in the system.3. Smart backup driver The

holding a large number of customer service servers.The Nginx_http_push_module (NHPM) module can cause your nginx to be a comet Server.NHPM provides two antor, one is publisher, the message publisher, one is the Subscriber, the client, and the relationship they contact is channel, channel.This is a rough sketch.Install NHPM, in the compilation Nginx is to use the Add-module will download the module to add, the official website is https://pushmodule.sl

null . When a response is received, in general, the status is judged to be 200, which is a sign of the success of this request. At this timeresponseTextThe contents of the property are ready, and if the content type is correct,responseXMLAlso be able to access the.In addition, the status codestatusIf it is 304, then the requested resource is not modified, it can be used directly in the browser cache, of course, such a response is also valid.if ( (xhr.status>=200xhr.status Some browsers

Specific look at the code, crap don't sayPHP Service Side$mem=NewRtmem ();if(!$mem-Conn ())Exit(' No MEM server ');if(!$mem-getstate ())Exit(' Moonjksrv is not runing ');$alminfo=$mem->get (' Alm_info ');if(!$alminfo)Exit(' No alarm ');$almobj= Json_decode ($alminfo);if(!$almobj)Exit(' No JSON data ');$lastmodif=isset($_get[' timestamp ']) ?$_get[' timestamp ']: 0;$currentmodif=$almobj-timestamp; while($currentmodif$lastmodif)//Check if the data file has been modified{Usleep(1000000);//Sleep 1 S

Comet Inverse Ajax model principle and model (note i)There are two ways to live web chat:The first: constantly querying for new messages, consuming resources, not real real-timeThe second type: Using reverse Ajax, the page is constantly open, the data is sent immediately, real real-timeLet's start by simply making a page that is constantly open to the browser:1 Ob_start();2 3PHP4 5 /*Inverse ajax Principle6 7 * Co