（24）request的结构

这里指的是发送的结构：

先上代码：

var http = require("http");var util = require("util");var server = new http.Server();server.on("request", function (req, res) {    res.writeHead(200, {'Content-type': 'text/html;charset = utf8'});    res.write("
这里是一个头
");    res.write("是否完成：" + req.complete);    res.write("
Http版本协议：" + req.httpVersion);    res.write("
请求方法：" + req.method);    res.write("
原始请求路径：" + req.url);    res.write("
请求头：" + util.inspect(req.headers)); //将其转为字符串    res.write("
请求尾：" + util.inspect(req.trailers));    res.write("
当前连接套接字：" + req.connetion);    res.write("
上面的别名：" + req.socket);    res.write("
client属性的别名：" + req.client);    res.end();})server.listen(80);console.log("The server begin");

结果为：

这里是一个头

是否完成：false

Http版本协议：1.1 请求方法：GET 原始请求路径：/ 请求头：{ host: '127.0.0.1', connection:'keep-alive', 'cache-control': 'max-age=0', 'upgrade-insecure-requests': '1','user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36(KHTML, like Gecko) Chrome/51.0.2704.63 Safari/537.36', accept:'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8','accept-encoding': 'gzip, deflate, sdch', 'accept-language': 'zh-CN,zh;q=0.8' } 请求尾：{} 当前连接套接字：undefined 上面的别名：[object Object] client属性的别名：[objectObject]

另外，请求头是一个对象，因此可以列出他的属性，使用for in遍历之，如代码：

var http = require("http");var util = require("util");var server = new http.Server();server.on("request", function (req, res) {    res.writeHead(200, {'Content-type': 'text/html;charset = utf8'});    for (var i in req.headers) {        res.write("req.headers[" + i + "]: " + req.headers[i] + "
")    }    res.end();})server.listen(80);console.log("The server begin");

结果：

req.headers[host]: 127.0.0.1

req.headers[connection]: keep-alive req.headers[cache-control]: max-age=0 req.headers[upgrade-insecure-requests]: 1 req.headers[user-agent]: Mozilla/5.0 (Windows NT 6.1; Win64; x64)AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.63 Safari/537.36 req.headers[accept]: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 req.headers[accept-encoding]: gzip, deflate, sdch req.headers[accept-language]: zh-CN,zh;q=0.8

 

另外，很奇怪的是，我试着使用req.headers[cache-control]

或者是req.headers.cache-control，都无法出来正常的结果，不明白。

 

关于cache-control的取值

http://www.phpernote.com/seo/465.html