The POST method in HTTP submits data in different formats

HTTP data is submitted through post. The biggest difference between submitting data in different formats is that the data is organized in different ways and the content-Type format corresponding to different formats needs to be set

package main

import (
   "bytes"
   "encoding/json"
   "fmt"
   "io"
   "io/ioutil"
   "mime/multipart"
   "net/http"
   "net/url"
   "os"
   "strings"
)

func postForm(a){
   data := make(url.Values)
   data.Add("name"."yuan")
   data.Add("age"."18")
   payload := data.Encode()

   resp, err := http.Post("http://httpbin.org/post"."application/x-www-form-urlencoded", strings.NewReader(payload))
   iferr ! =nil {
      panic(err)
   }

   defer func(a) {_ = resp.Body.Close()}()

   content, err := ioutil.ReadAll(resp.Body)
   fmt.Printf("%s", content)
   / / {
   // "args": {},
   // "data": "",
   // "files": {},
   // "form": {
   // "age": "18",
   // "name": "yuan"
   / /},
   // "headers": {
   // "Accept-Encoding": "gzip",
   // "Content-Length": "16",
   // "Content-Type": "application/x-www-form-urlencoded",
   // "Host": "httpbin.org",
   / / "the user-agent" : "Go - HTTP client / 1.1",
   // "X-Amzn-Trace-Id": "Root=1-60e4770f-2a5448187a3ae2d560ebf3ff"
   / /},
   // "json": null,
   / / "origin", "222.211.214.252",
   // "url": "http://httpbin.org/post"
   / /}
}

func postJson(a) {
   u := struct {
      Name string `json:"name"`
      Age int `json:"age"`
   }{
      Name: "yuan",
      Age: 18,
   }

   payload, _ := json.Marshal(u)
   //data := make(url.Values)
   //data.Add("name", "yuan")
   //data.Add("age", "18")
   //payload := data.Encode()

   resp, err := http.Post("http://httpbin.org/post"."application/json", bytes.NewReader(payload))
   iferr ! =nil {
      panic(err)
   }

   defer func(a) { _ = resp.Body.Close() }()

   content, err := ioutil.ReadAll(resp.Body)
   fmt.Printf("%s", content)
   / / {
   // "args": {},
   // "data": "{\"name\":\"yuan\",\"age\":18}",
   // "files": {},
   // "form": {},
   // "headers": {
   // "Accept-Encoding": "gzip",
   // "Content-Length": "24",
   // "Content-Type": "application/json",
   // "Host": "httpbin.org",
   / / "the user-agent" : "Go - HTTP client / 1.1",
   // "X-Amzn-Trace-Id": "Root=1-60e47872-48e5cb7c65ce959f03544ffb"
   / /},
   // "json": {
   // "age": 18,
   // "name": "yuan"
   / /},
   / / "origin", "222.211.214.252",
   // "url": "http://httpbin.org/post"
   / /}
}

func postFile(a){
   body := &bytes.Buffer{}
   writer := multipart.NewWriter(body)

   upload1, _ := writer.CreateFormFile("formName1"."test.txt")
   uploadFile1, _:= os.Open("test.txt")
   defer uploadFile1.Close()
   io.Copy(upload1, uploadFile1)

   upload2, _ := writer.CreateFormFile("formName2"."test.txt")
   uploadFile2, _:= os.Open("test.txt")
   defer uploadFile2.Close()
   io.Copy(upload2, uploadFile2)

   writer.Close()
   // The above data is organized
   fmt.Println(writer.FormDataContentType())
   resp, err := http.Post("http://httpbin.org/post", writer.FormDataContentType(), body)
   iferr ! =nil {
      panic(err)
   }
   defer func(a) {_ = resp.Body.Close()}()

   content, _ := ioutil.ReadAll(resp.Body)
   fmt.Printf("%s", content)
   / / {
   // "args": {},
   // "data": "",
   // "files": {
   // "formName1": "qwqwertwertwertwert",
   // "formName2": "qwqwertwertwertwert"
   / /},
   // "form": {},
   // "headers": {
   // "Accept-Encoding": "gzip",
   // "Content-Length": "462",
   // "Content-Type": "multipart/form-data; boundary=c7d43bcbc370e8f128df077361e7f5551970ee279eb483fc4c1a7016e68f",
   // "Host": "httpbin.org",
   / / "the user-agent" : "Go - HTTP client / 1.1",
   // "X-Amzn-Trace-Id": "Root=1-60e4806a-501ee1f8562afc5c74143bcf"
   / /},
   // "json": null,
   / / "origin", "222.211.214.252",
   // "url": "http://httpbin.org/post"
   / /}
}

func main(a){
   / / postForm () / / post form
   //postJson() //post Json
   postFile() //post file
}
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