如何使用带有 GoLang 的编码器编组整个 http.Request？

Question

I have a simple go server...

package main

import (
  "net/http"
  "log"
)

func simple(w http.ResponseWriter, r *http.Request){
  b := []byte("Hello World")
  w.Write(b)
}
func main(){
  http.HandleFunc("/", index)
  log.Fatal(http.ListenAndServe(":8080", nil))
}

Now I want to print out the whole request. I want headers, url, payload, etc. I see in Go this is typically done by using an "encoder" to "marshal" the object but when I try that...

import (
  "net/http"
  "log"
  "encoding/json"
)
func simple(w http.ResponseWriter, r *http.Request){
  e, err := json.Marshal(r)
  if(err != nil){
    log.Fatal(err)
  }
  w.Write(e)
}

with the request object I get...

json: unsupported type: func() (io.ReadCloser, error)

Again this makes sense to me because, although I am new to go, I can understand that this is a function that returns a stream. My question is what do I need to use to get EVERYTHING in the request including headers (SERVER COOKIES). I know I can write a custom Marshaler but I would like to avoid that.

Is there a simple way to marshal an entire http request in go?

Answer 1

If you're interested in the body and the headers, you can get them this way:

package main

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

func main() {
  body := `{"foo": "bar"}`
  req, _ := http.NewRequest(http.MethodPost, "http://my.url", strings.NewReader(body))
  req.Header.Add("my-header-key", "my-header-value")
  req.AddCookie(&http.Cookie{Name: "my-cookie", Value: "cookie-value"})

  fmt.Println("body:")
  reqBody, _ := req.GetBody()
  readReqBody, _ := ioutil.ReadAll(reqBody)
  fmt.Println(string(readReqBody))
  fmt.Println()

  fmt.Println("cookies:")
  for name, value := range req.Header {
    fmt.Println(name, value)
  }
}

This should print this:

body:
{"foo": "bar"}

cookies:
My-Header-Key [my-header-value]
Cookie [my-cookie=cookie-value]