Java（Tomcat）：如何配置无cookie子域以提供静态内容(Java (Tomcat): how to configure a cookieless subdomain to serve static content)

 Google和Yahoo!给出的提示之一 加速网页加载是将无cookie子域配置为服务器静态内容。 
 
 如何在独立模式下使用Tomcat配置“无cookie子域”（这个问题不是关于如何使用Apache以无cookie方式提供静态内容，而是关于如何在Tomcat-standalone模式下执行此操作）？ 
 
 请注意，我不关心支持If-Modified-Since过滤器If-Modified-Since也不关心支持gzipping的过滤器：我所服务的静态内容是永远可缓存的（或者它的名称会改变）并且它已经是压缩数据（所以gzip只会减慢转移）。 
 
 我需要两个不同的Tomcat webapps吗？ （一个“cookiefull”和一个“cookieless”） 
 
 我需要两个不同的servlet吗？ （截至目前，我只有一个调度程序/控制器servlet）。 
 
 为什么静态图像的“常规”链接会以cookiefull的方式调用，当它与主webapp在同一个域中时，然后当它在子域上时以“无cookie”方式调用？ 
 
 我不确切地知道发生了什么：是否是浏览器决定是否将cookie附加到查询中？ 如果是这样，为什么不将cookie附加到“无cookie”子域上的静态查询中。 
 
 任何关于幕后发生的事情的例子都是最受欢迎的:) 

One of the tip given by both Google and Yahoo! to speed up webpages loading is to configure a cookieless subdomain to server static content.
 
How do you configure a "cookieless subdomain" using Tomcat in standalone mode (this question is not about how to use Apache to serve static content in a cookieless-way, but about how to do it in Tomcat-standalone mode)?
 
Note that I don't care about filters supporting If-Modified-Since nor care about filters supporting gzipping: the static content I'm serving is forever cacheable (or its name will change) and it is already compressed data (so gzip would only slow down the transfer).
 
Do I need two different Tomcat webapps? (one "cookiefull" and one "cookieless")
 
Do I need two different servlets? (as of now I've got only one dispatcher/controller servlet).
 
Why would a "regular" link to, say, a static image be called in a cookiefull way when it would be on the same domain as the main webapp and then be called in a "cookie-less" way when it is on a subdomain? 
 
I don't understand exactly what is going on: is it the browser that decides to append or not cookies to the query? If so, why would it not append the cookies to a static query on a "cookieless" subdomain.
 
Any example as to what is going on behind the scene is most welcome :)

原文：https://stackoverflow.com/questions/2884065