Get post data using golang http package

Question

I am new to golang, getting familiar with http package. I am having trouble in getting the post data I am sending using postman.

http://localhost:8084/dbTest is my URI. I am passing key: hub_id value: 1 using form-data. I tried following approaches,

req.ParseForm()
fmt.Println("hub_id", req.Form["hub_id"])
req.Form.Get("hub_id")

But none of the approach work. I am getting empty response.

Following is my code:

package main

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

func dbtest(w http.ResponseWriter, req *http.Request) {
  req.ParseForm()
  fmt.Println("hub_id", req.Form["hub_id"])
  req.Form.Get("hub_id")
  fmt.Println(req.PostFormValue("hub_id")) //response is empty
}

func main() {

    http.HandleFunc("/dbTest", dbtest)

  log.Fatal(http.ListenAndServe(":8084", nil))
}

When I print req i get the following:

&{POST /dbTest HTTP/1.1 1 1 map[Origin:[chrome-extension://fhbjgbiflinjbdggehcddcbncdddomop] Connection:[keep-alive] Content-Type:[multipart/form-data; boundary=----WebKitFormBoundarydFOTVjOJMeqOHnS3] Content-Length:[138] Accept-Language:[en-US,en;q=0.8] Cache-Control:[no-cache] Accept-Encoding:[gzip, deflate] Accept:[*/*] User-Agent:[Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36] Postman-Token:[ac7ae3a9-60f6-2146-3f1c-209de7622774]] 0xc210012e70 138 [] false localhost:8084 map[] map[] <nil> map[] 127.0.0.1:34152 /dbTest <nil>}

Solution: I found the solution. Since, content-type is mulipart/form-data I correct way to parse form is to use req.ParseMultipartForm http method.

Please show your html template. – Endre Simo Aug 24 '16 at 11:58 — Endre Simo, Aug 24 '16 at 11:58
I am sending data via postman – Jagrati Aug 24 '16 at 12:06 — Jagrati, Aug 24 '16 at 12:06

score 3 · Accepted Answer · answered Aug 24 '16 at 13:01

3

You are using incorrect Content-Type. When using Content-Type:application/x-www-form-urlencoded, r.ParseForm() will parse data correctly. Check r.Form afterwards.

answered Aug 24 '16 at 13:01

s7anley

2,408
22
17

Will you please explain it more. Here the content type is `Content-Type:[multipart/form-data; boundary=----WebKitFormBoundarydFOTVjOJMeqOHnS3]` which is send by POSTMAN. – Jagrati Aug 24 '16 at 13:55
1

Take a look here for explanation - http://stackoverflow.com/questions/4007969/application-x-www-form-urlencoded-or-multipart-form-data#answer-4073451 In Postman, you can define different `Content-Type`. In body section, below URL address you can pick different types. – s7anley Aug 24 '16 at 14:08
yes, I got the value by using `Content-Type:application/x-www-form-urlencoded` but suppose in future i will have to send `binary (non-alphanumeric) data (or a significantly sized payload) ` then `multipart/form-data` should be used. How to obtain POST data when content-type is `multipart/form-data` in go. – Jagrati Aug 25 '16 at 05:22
1

I found the solution. Since, content-type is `mulipart/form-data` ,the correct way to parse form is to use `req.ParseMultipartForm` http method. – Jagrati Sep 14 '16 at 10:09

Sridhar · Answer 2 · 2016-08-24T12:03:31.227

0

Try

err := r.ParseForm()
v := r.Form
h := v.Get("hub_id")

Edit: I see you've tried ParseForm

edited Aug 24 '16 at 12:03

answered Aug 24 '16 at 11:51

Sridhar

2,416
1
26
35

Are you posting the data, i.e. Method="POST" from a form ? – Sridhar Aug 24 '16 at 11:57
Try adding a Methods("POST") to the handleFunc ? – Sridhar Aug 24 '16 at 11:58
err := r.ParseForm() prints v := r.Form prints map[] h := v.Get("hub_id") prints nothing – Jagrati Aug 24 '16 at 12:02
Also, when i print req.Method it prints POST. This means that it is a POST request – Jagrati Aug 24 '16 at 12:03
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/121732/discussion-between-jagrati-and-sridhar). – Jagrati Aug 24 '16 at 12:12

Get post data using golang http package

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