HTTP Header 在线解析

访问 dhcp.cn/headeropen in new window 查看当前 HTTP Header

1. 通过 curl 命令模拟发送

1.1 GET 请求示例

curl dhcp.cn/header/shop 

UserAgent: curl/7.64.1 
Protocol: HTTP/1.1
Method: GET
Host: header.dhcp.cn
RemoteAddr: 192.168.31.125:56672
RequestURI: /header/shop
Header: map[Accept:[*/*] User-Agent:[curl/7.64.1]]
Body:
X-Forwarded-For:
Accept: */*
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1.1 POST 请求示例

curl -XPOST -H 'X-Forwarded-For: 192.168.1.1' -H "content-Type: application/JSON"  dhcp.cn/header/mall -d '{"age": 22}'

UserAgent: curl/7.64.1
Protocol: HTTP/1.1
Method: POST
Host: header.dhcp.cn
RemoteAddr: 192.168.31.125:56028
RequestURI: /header/mall
Header: map[Accept:[*/*] Content-Length:[11] Content-Type:[application/JSON] User-Agent:[curl/7.64.1] X-Forwarded-For:[192.168.1.1]]
Body: {"age": 22}
X-Forwarded-For: 192.168.1.1
Accept: */*
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2. Golang 获取 HTTP Header

以下是一个完整的基于 Golang 实现的 HTTP Server,打印 HTTP Header。

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
)

func main() {

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {

		body, _ := ioutil.ReadAll(r.Body) // 获取 Body,因为 r.Body 的类型是 io.ReadCloser,而不是 string

		fmt.Fprintf(w, "UserAgent: %s\n", r.UserAgent())                         // 示例:curl/7.64.1,r.UserAgent() 是字符串,直接打印即可
		fmt.Fprintf(w, "Protocol: %s\n", r.Proto)                                // 示例:HTTP/1.1
		fmt.Fprintf(w, "Method: %s\n", r.Method)                                 // 示例:GET
		fmt.Fprintf(w, "Host: %s\n", r.Host)                                     // 示例:192.168.31.125,请求主机
		fmt.Fprintf(w, "RemoteAddr: %s\n", r.RemoteAddr)                         // 示例:192.168.31.125:54642,客户端地址(如果用了负载均衡器,请通过 X-Forwarded-For 来获取客户端真实IP)
		fmt.Fprintf(w, "RequestURI: %s\n", r.RequestURI)                         // 示例:/mall,请求URI
		fmt.Fprintf(w, "Header: %s\n", r.Header)                                 // 示例:map[Accept:[*/*] Content-Length:[11] Content-Type:[application/JSON] User-Agent:[curl/7.64.1] X-Forwarded-For:[192.168.1.1]]
		fmt.Fprintf(w, "Body: %s\n", body)                                       // 示例:{"age": 22},例如POST 请求的 Body
		fmt.Fprintf(w, "X-Forwarded-For: %s\n", r.Header.Get("X-Forwarded-For")) // 示例:192.168.1.1,自定义Header,一般有负载均衡器的场景会把客户端的真实IP存储在这里
		fmt.Fprintf(w, "Accept: %s\n", r.Header.Get("Accept"))                   // 示例:*/*

	})

	log.Println("Starting server ...")
	log.Fatal(http.ListenAndServe(":80", nil))
}
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