打造简易Tomcat:从原理到实战

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"《如何工作:Tomcat详解》是一本介绍Tomcat工作原理和技术的实用指南,由曹旭东在2011年5月26日编著,专为对Web开发感兴趣的读者设计。该书详细解释了Tomcat作为Servlet容器的工作机制,并通过实例逐步阐述了Tomcat的核心组件和功能。 第一章,"一个简单的Web服务器",首先介绍了基础概念,如超文本传输协议(HTTP),HTTP请求和响应。讲解了Socket类和ServerSocket类的作用,以及如何通过它们实现客户端与服务器的通信。作者通过实际例子帮助读者理解这些基本原理。 第二章深入到Servlet容器层面,介绍了javax.servlet.Servlet接口,强调了其在处理用户请求中的核心地位。书中提供了两个应用示例,一个是HttpServer1类,展示了一个简单的Servlet如何接收和响应请求;另一个是StaticResourceProcessor类,用于处理静态资源请求,以及ServletProcessor1类,演示了如何处理动态内容生成。 第三章,"连接器(Connector)"部分,重点讲解了Tomcat如何通过连接器处理网络连接。讲解了StringManager类的作用,以及如何从SocketInputStream中解析请求行、请求头、Cookie等信息,进而提取参数并创建HttpResponse。此外,还介绍了静态资源处理器和Servlet处理器在处理请求时的协作。 第四章探讨了Tomcat的默认连接器,包括HTTP 1.1新特性,如持久化连接、编码标准和状态码的使用。作者深入剖析了Connector接口和HttpConnector类的实现,展示了如何创建ServerSocket并处理来自客户端的请求。 《how-tomcat-works.pdf》是一本从入门到进阶的Tomcat技术教程,通过理论和实践相结合的方式,让读者了解Tomcat内部运作机制,从而更好地进行Web应用程序的开发和部署。无论是初学者还是经验丰富的开发者,都能从中收获关于Tomcat的重要知识点。"

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请翻译:202.192.1.5 is making SMTP connections which indicate that it is misconfigured. Some elements of your existing configuration create message characteristics identical to previously identified spam messages. Please align the mail erver's HELO/EHLO 'icoremail.net' with proper DNS (forward and reverse) values for a mail server. Here is an example: Correct HELO/DNS/rDNS alignment for domain example.com: - Mail server HELO: mail.example.com - Mail server IP: 192.0.2.12 - Forward DNS: mail.example.com -> 192.0.2.12 - Reverse DNS: 192.0.2.12 -> mail.example.com Correcting an invalid HELO or a HELO/forward DNS lookup mismatch will stop the IP from being listed again. Points to consider: * Alignment: it is strongly recommended that the forward DNS lookup (domain name to IP address) and rDNS (IP to domain) of your IP should match the HELO value set in your server, if possible * The IP and the HELO value should both have forward and rDNS, and should resolve in public DNS * Ensure that the domain used in HELO actually exists! Additional points: * According to RFC, the HELO must be a fully qualified domain name (FQDN): "hostname.example.com" is an FQDN and "example.com" is not an FQDN. * The domain used should belong to your organisation. * HELO is commonly a server setting, not DNS. Contact your hosting provider for assistance if needed. You can test a server's HELO configuration by sending an email from it to helocheck@abuseat.org. A bounce that contains the required information will be returned immediately. It will look like an error, it is not. Please examine the contents of this email. If all settings are correct, you have a different problem, probably malware/spambot. Again, the HELO we are seeing is 'icoremail.net'. The last detection was at 2023-05-27 13:35:00 (UTC). For information on misconfigured or hacked SMTP servers and networks, please see this FAQ: https://www.spamhaus.org/faq/section/Hacked...%20Here's%20help#539 CSS listings expire a few days after last detection. You can always open a ticket (or update an existing one) to inform us when and how the situation was been secured.

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