Golang - Sending API POST Request - Not enough arguments error - api

Question

The following code attempts to send a POST API request with a payload that is in RequestDetails.FormData. When I run main.go function, then I get the following errors.
go run main.go
# command-line-arguments
./main.go:53:17: not enough arguments in call to http.HandleFunc
./main.go:53:33: not enough arguments in call to reqDetails.Send
have ()
want (http.ResponseWriter, *http.Request)
./main.go:53:33: reqDetails.Send() used as value
The code is available below. Anybody knows what I could do wrong here? Thanks a lot for your help.
//main.go
package main
import (
"bytes"
"encoding/json"
"fmt"
"log"
"net/http"
)
// RequestDetails contains input data for Send
type RequestDetails struct {
EndPoint string
FormType string
FormData map[string]string
}
// Send sends API POST request to an endpoint
func (rd RequestDetails) Send(w http.ResponseWriter, r *http.Request) {
json_data, err := json.Marshal(rd.FormData)
if err != nil {
log.Fatal(err)
}
resp, err := http.Post(rd.EndPoint, rd.FormType, bytes.NewBuffer(json_data))
if err != nil {
log.Fatal(err)
}
fmt.Println(resp)
}
func main() {
m := map[string]string{
"AuthParamOne": "AP0000001",
"AuthParamTwo": "AP0000002",
"AuthParamThree": "AP0000003",
}
reqDetails := RequestDetails{
EndPoint: "https://httpbin.org/post",
FormType: "application/json",
FormData: m,
}
http.HandleFunc(reqDetails.Send())
}

Answer 1

you have to use HandleFunc in following below:
func HandleFunc(pattern string, handler func(ResponseWriter, *Request))
for code above follow this:
http.HandleFunc("/test",reqDetails.Send) //-> add reference instead of calling 'reqDetails.Send()'
reference: https://pkg.go.dev/net/http#HandleFunc
please vote up :)

Answer 2

In your Send method, you don't make use of w http.ResponseWriter, r *http.Request, So it seems you don't need them:
func (rd RequestDetails) Send() {...
Also in your last line, HandleFunc requires different arguments which once again is not necessary in your case. Just try to run the Send method:
reqDetails.Send()
The whole main.go file:
//main.go
package main
import (
"bytes"
"encoding/json"
"fmt"
"log"
"net/http"
)
// RequestDetails contains input data for Send
type RequestDetails struct {
EndPoint string
FormType string
FormData map[string]string
}
// Send sends API POST request to an endpoint
func (rd RequestDetails) Send() {
json_data, err := json.Marshal(rd.FormData)
if err != nil {
log.Fatal(err)
}
resp, err := http.Post(rd.EndPoint, rd.FormType, bytes.NewBuffer(json_data))
if err != nil {
log.Fatal(err)
}
fmt.Println(resp)
}
func main() {
m := map[string]string{
"AuthParamOne": "AP0000001",
"AuthParamTwo": "AP0000002",
"AuthParamThree": "AP0000003",
}
reqDetails := RequestDetails{
EndPoint: "https://httpbin.org/post",
FormType: "application/json",
FormData: m,
}
reqDetails.Send()
}

Answer 3

if your code like this
watcher := bufio.NewReader(os.Stdin)
input, _ := watcher.ReadString()
fmt.Println(input)
you needed this for reading line line
old -> input, _ := watcher.ReadString()
new -> input, _ := watcher.ReadString('\n')