Monitoring the metrics and runtime characteristics of an application server is essential to ensure the adequate functioning of the applications running on that server, as well as to prevent or resolve potential issues in a timely manner.
As far as Java applications go, one of the most commonly used servers is Apache Tomcat, which will be the focus of this article.
Tomcat performance monitoring can be done either by relying on JMX beans or by using a dedicated monitoring tool like MoSKito or JavaMelody.
网上有很多人会分享一些免费的 ss/ssr 免费账号，有的会直接把服务、端口、ip、协议等展示出来（对于这种，直接手动输入相应参数就可以了），有的则直接显示二维码（二维码更方便，直接用客户端软件扫一下就可以使用）。
不过，也有很多是直接以链接的形式展示出来，比如 ss://xxxxx 或 ssr://xxxx,对于这种链接的方式，复制链接后，然后直接使用 ss 、ssr 客户端软件导入链接即可。以 ssr 链接为例，假设有这么一个链接（以下的 ss ssr 链接都转载至 https://doub.io/sszhfx/）。
ShadowSocks 默认使用 GFWList 规则和使用 adblock plus 的引擎。要想自己添加自定义的用户规则，最好熟悉一下其规则。当一个网站被墙，如何添加到 PAC 里面让其能够正常访问呢？以 MDN Web doc 这个网站为例，在 Shadowsocks 里面，可以有如下两个方式：使用 pac.txt 文件，或使用 user-rule.txt 文件。
Caching is a useful yet surprisingly complex feature of Web browsers.
In this article, we’ll explain the how the browser uses its cache to load pages faster, which factors determine cache duration, and how we can bypass the cache when necessary.
If it’s taking more than 3 seconds then you should be really worried about your site speed. Because No-one really likes slow loading websites.
There is no meaning of doing all the hard work to produce amazing content because if your website is too slow to load, the user is going to get bounced from your website.
So if you are really worried about your website speed and want to optimize it for your user and SEO you are at the right place.
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