web服务器 - .net,java,php这些服务器端的进程是如何获取web客户端传递的参数的？
首先谈下我对这个过程的模糊认识:
1.Web客户单向Web服务器发起请求
2.Web服务器启动一个CGI进程，CGI进程从打开的文件描述符中读取请求数据
3.问题:
a.CGI进程如何将请求参数传递给.net,java,php这些进程?
b.net,java,php这些进程是一直运行的吗？
c.一个简单的HTTP请求至少要涉及到3个进程间的通信?
回复内容：
首先谈下我对这个过程的模糊认识:
1.Web客户单向Web服务器发起请求
2.Web服务器启动一个CGI进程，CGI进程从打开的文件描述符中读取请求数据
3.问题:
a.CGI进程如何将请求参数传递给.net,java,php这些进程?
b.net,java,php这些进程是一直运行的吗？
c.一个简单的HTTP请求至少要涉及到3个进程间的通信?
a、通过环境变量和STDIN传递信息
b、CGI进程有几种运行方式，普通的CGI是不一直运行的，每次请求都会创建一个CGI进程，但是这种方式会导致CGI进程的频繁创建和销毁浪费性能，所以就有了FAST-CGI，CGI进程会在一个进程池里呆着，每当有请求就会唤醒一个进程去处理，处理完成就回到进程池
c、以lnmp为例，请求首先送给Nginx，然后由nginx交给php-fpm，php-fpm是PHP的FAST-CGI管理器，收到nginx发来的请求后再传递给php-cgi，处理完成再传递回去，于是就有三个进程参与此次请求的处理
既然是web客户端的就大致说下走http的数据把：
题主可以先看看http文件格式，我们的GET、POST、COOKIE这些数据都是包装在http信息里面的纯文本，
到server端，收到这些http数据的软件会对这些纯文本进行解析，就这样
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