如何接受来自Go的POST请求并将输出写入文件？

Question

First of all, I'm trying to create a logging service in Go, where it is a lightweight server accepting POST requests with log data from my service. I'm writing this service in Go because it is supposed to be fast and handle a lot of POST requests at once. Is my logic sound there?

Anyways, this is my issue. I'm sending POST requests like this to test: curl -H "Content-Type: application/json" -X POST -d '{"hello":"world"}' http://localhost:8080/log

And here is my Go script so far:

package main

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

func logger(w http.ResponseWriter, r *http.Request) {
   r.ParseForm()
   fmt.Println(r.Form)
   fmt.Println(r.FormValue("hello"))
}

func main() {
   http.HandleFunc("/log", logger)
   log.Fatal(http.ListenAndServe(":8080", nil))
}

It is outputting: map []

Why is that? How could I write the POST data to a file on the server?

Thank you very much! W

Answer 1

You're not POST'ing a form, you're sending json data in the request body.

Read the data directly:

body, err := ioutil.ReadAll(r.Body)
if err != nil {
    log.Println("ERROR:", err)
}