Mux: POST request example

'Route' type provides 'Methods' function, it is used to support HTTP requests like POST, GET, PUT etc.,

Example

router.HandleFunc("/users", CreateUser).Methods("POST")

Above statement maps POST request to the url /users to CreateUser function.

App.go

package main

import (
 "crypto/rand"
 "fmt"
 "net/http"

 "encoding/json"
 "io/ioutil"

 "github.com/gorilla/mux"
)

func main() {
 router := mux.NewRouter()

 router.HandleFunc("/", HomePageHandler)

 router.HandleFunc("/welcome/{name}", WelcomeUser)

 router.HandleFunc("/users", CreateUser).Methods("POST")

 http.Handle("/", router)
 http.ListenAndServe(":8080", nil)
}

// HomePageHandler send Hello World message to the client
func HomePageHandler(writer http.ResponseWriter, request *http.Request) {
 dataToWrite := []byte("Hello World")

 writer.Header().Set("Content-Type", "text/html")
 writer.Write(dataToWrite)
}

//WelcomeUser display welcome message to given user
func WelcomeUser(writer http.ResponseWriter, request *http.Request) {
 vars := mux.Vars(request)

 userName := vars["name"]

 dataToWrite := []byte("Hello " + userName + ", Welcome to Go language")

 writer.Header().Set("Content-Type", "text/html")
 writer.WriteHeader(http.StatusOK)
 writer.Write(dataToWrite)
}

//CreateUser creates new user
func CreateUser(writer http.ResponseWriter, request *http.Request) {

 defer request.Body.Close()
 requestBytes, _ := ioutil.ReadAll(request.Body)

 user := User{}
 json.Unmarshal(requestBytes, &user)

 user.ID = *GenerateRandomString()

 responseBytes, _ := json.Marshal(user)

 writer.Header().Set("Content-Type", "application/json")
 writer.WriteHeader(http.StatusCreated)
 writer.Write(responseBytes)

}

//User type represents a user object
type User struct {
 FirstName string
 LastName  string
 ID        string
}

//GenerateRandomString generate random string
func GenerateRandomString() *string {
 tempBytes := make([]byte, 16)
 _, err := rand.Read(tempBytes)

 if err != nil {
  fmt.Println("Error: ", err)
  return nil
 }

 uuid := fmt.Sprintf("%X-%X-%X-%X-%X", tempBytes[0:4], tempBytes[4:6], tempBytes[6:8], tempBytes[8:10], tempBytes[10:])

 return &uuid
}

Run App.go.

Use any Rest client like postman and hit below request to create new user.

Method: POST

url : http://localhost:8080/users

Body:

{

        

         "FirstName" : "Krishna",

         "LastName" : "Maj"

        

}

Headers

Content-Type : application/json

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