Javascript 谁添加“_”单下划线查询参数？
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Who Add "_" Single Underscore Query Parameter?
提问by ZZ Coder
I have a PHP server running on Apache, I get lots of request looks like this,
我有一个在 Apache 上运行的 PHP 服务器，我收到很多这样的请求，
10.1.1.211 - - [02/Sep/2010:16:14:31 -0400] "GET /request?_=1283458471913&action=get_list HTTP/1.1" 200 547 0 "http://www.example.com/request" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8 (.NET CLR 3.5.30729)" 28632 15602
The _ parameter is mysteriously added to the request. I am trying to find out who is doing that.
_ 参数神秘地添加到请求中。我试图找出谁在这样做。
There is a NetScaler running in front of Apache.
有一个 NetScaler 在 Apache 前面运行。
回答by Patricia
jQuery adds a parameter like that to get around IE's caching.
jQuery 添加了一个类似的参数来绕过 IE 的缓存。
edit: it only adds it for get requests, and only if the option cache is false:
edit: it only adds it for get requests, and only if the option cache is false:
cache: false
回答by Colin Hebert
It could be the JQuery CacheBuster parameter.
它可能是 JQuery CacheBuster 参数。
Resources :
资源 ：
回答by Artefacto
Probably it's a dummy parameter added by the reverse proxy to force non-cached content to be served.
可能这是反向代理添加的虚拟参数，用于强制提供非缓存内容。
回答by jfrobishow
1283458471913 is a unix timestamp in ms, probably a bot/proxy making sure that they get a fresh page and not a cached version.
1283458471913 是一个以 ms 为单位的 unix 时间戳，可能是一个机器人/代理，确保他们获得一个新页面而不是缓存版本。
Could also be jQuery which would cause this for AJAX request of you have the nocache attribute set to true.
也可能是 jQuery，它会导致您将 nocache 属性设置为 true 的 AJAX 请求。
if ( s.cache === false && type == "GET" ) {
var ts = now();
// try replacing _= if it is there
var ret = s.url.replace(/(\?|&)_=.*?(&|$)/, "_=" + ts + "″);
// if nothing was replaced, add timestamp to the end
s.url = ret + ((ret == s.url) ? (s.url.match(/\?/) ? "&" : "?") + "_=" + ts : "");
}
