【go】http实验

实验1：上手篇

package main

import (
    "net/http"
    //"fmt"
    "os"
)

func proxyFunc(response http.ResponseWriter, req *http.Request) {
    os.Stdout.WriteString(req.Host + "\n")
    response.Write([]byte(req.Host +"\n"))
    return
}

func main() {
    http.HandleFunc("/", proxyFunc)
    http.ListenAndServe(":9111", nil)
}

编译：go build proxy.go

执行：./proxy

客户端测试：curl curl http://127.0.0.1:9111/

测试输出：127.0.0.1:9111

实验2：获取request的body数据长度

package main

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

func proxyFunc(response http.ResponseWriter, req *http.Request) {
    body, _ := ioutil.ReadAll(req.Body)
    bodyLen := len(string(body))
    response.Write([]byte(fmt.Sprintf("body len: %d\n", bodyLen)))
    return
}

func main() {
    http.HandleFunc("/", proxyFunc)
    http.ListenAndServe(":9111", nil)
}

执行：go build proxy.go && ./proxy

测试：curl --data "a=a" http://127.0.0.1:9111/

测试输出：body len: 3

实验3：做个中转机，前端请求，go中转给后端的服务

proxy.go代码

package main

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

func proxyFunc(response http.ResponseWriter, req *http.Request) {
    client := &http.Client{}

    path := req.URL.Path
    query := req.URL.RawQuery

    url := "http://127.0.0.1:9112"
    url += path
    if len(query) >  {
        url += "?" + query
    }   

    proxyReq, err := http.NewRequest("POST", url, req.Body)

    if err != nil {
        response.Write([]byte("http proxy request fail\n"))
        return
    }   

    proxyReq.Header.Set("Content-Type", "application/x-www-form-urlencoded")
    proxyReq.Header.Set("Cookie", "name=cookie")

    resp, err := client.Do(proxyReq)
    defer resp.Body.Close()

    out, _ := ioutil.ReadAll(resp.Body)
    response.Write(out)
}

func main() {
    http.HandleFunc("/", proxyFunc)
    http.ListenAndServe(":9111", nil)
}

backend.go代码

package main

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

func procFunc(response http.ResponseWriter, req *http.Request) {
    postBody, _ := ioutil.ReadAll(req.Body)
    response.Write([]byte("query: " + req.URL.RawQuery + "\nbody: "))
    response.Write(postBody)
    response.Write([]byte("\n"))
    response.Write([]byte("backend port: 9112\n"))
}

func main() {
    http.HandleFunc("/", procFunc)
    http.ListenAndServe(":9112", nil)
}

proxy负责中转客户端请求，转到backend来处理，backend根据输入，直接打印其输出 query + post body

测试：curl --data "a=a"  http://127.0.0.1:9111/?b=b1111

测试输出：

query: b=b1111
body: a=a
backend port: 

本篇文章测试了：go的http server，http server对应的post数据，和golang的http request能力，代码很简单

结束分隔符！