Golang request body keep giving EOF error

Question

I have the following Go program which I want to read the JSON values send from via post. I have tried few different methods example r.Body = http.MaxBytesReader(w, r.Body, 1048576) first then only run Json.NewDecoder(r.Body).Decode(&u). All methods seems to be giving the same EOF error. I have even tried this body, err := ioutil.ReadAll(r.Body). So all seem the same

func insertUser(w http.ResponseWriter, r *http.Request) { type User struct { Uemail string `json:"uEmail"` Upass string `json:"uPass"` } var u User if r.Method == "POST" { if r.Header.Get("Content-Type") != "" { value, _ := header.ParseValueAndParams(r.Header, "Content-Type") if value != "application/json" { msg := "Content-Type header is not application/json" json.NewEncoder(w).Encode(Errormessage{msg}); return } } //r.Body = http.MaxBytesReader(w, r.Body, 1048576) /*body, err := ioutil.ReadAll(r.Body) if err != nil { return err }*/ err := json.NewDecoder(r.Body).Decode(&u) if err != nil { fmt.Println("Decoding error is :", err) json.NewEncoder(w).Encode(Errormessage{"Message decoding Issue"}); return } var uEmail string = u.Uemail var uPass string = u.Upass fmt.Println("User Namess :", uEmail) fmt.Println("User Password :", uPass) w.Header().Set("Content-Type", "application/json; charset=utf-8") w.Header().Set("X-Content-Type-Options", "nosniff") }

I am just sending the request via postman I can confirm it send not empty — user8012596
– user8012596, Commented Apr 13, 2022 at 12:54
I dont understand in my code I dont ready before this only part I check the error ensure the content type is application/json other than that I dont touch the body in that part above. — user8012596
– user8012596, Commented Apr 13, 2022 at 12:56
Either there is no body, or something read it already. Are you using any other handlers or middleware? Can you provide a minimal reproducible example? What you have here (without ioutil.ReadAll(r.Body) of course) does work as expected. — Mr_Pink
– Mr_Pink, Commented Apr 13, 2022 at 13:10
Sure let me provide more codes cause I minimize the codes to avoid too messy. — user8012596
– user8012596, Commented Apr 13, 2022 at 13:35
@jimB I have put my full working codes here pastebin.com/UFbmJTrP. Its the complete codes I remove everything else there. — user8012596
– user8012596, Commented Apr 13, 2022 at 13:39

Suyash Medhavi · Accepted Answer · 2022-04-19 12:30:42Z

Please try running the following

func insertUser(w http.ResponseWriter, r *http.Request) { type User struct { Uemail string `json:"uEmail"` Upass string `json:"uPass"` } var u User if r.Method == "POST" { if r.Header.Get("Content-Type") != "" { value, _ := header.ParseValueAndParams(r.Header, "Content-Type") if value != "application/json" { msg := "Content-Type header is not application/json" json.NewEncoder(w).Encode(Errormessage{msg}); return } } // CODE CHANGED HERE body, err := ioutil.ReadAll(r.Body) defer r.Body.Close() if err != nil { // handle error return } err = json.Unmarshal(body, &u) if err != nil { // handle error return } // CHANGED TILL HERE var uEmail string = u.Uemail var uPass string = u.Upass fmt.Println("User Namess :", uEmail) fmt.Println("User Password :", uPass) w.Header().Set("Content-Type", "application/json; charset=utf-8") w.Header().Set("X-Content-Type-Options", "nosniff") } }

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