golangHow to get client IP from HTTP server

package main
import ( "fmt"; "net/http"; "strings" )

func ip(w http.ResponseWriter, req *http.Request) {
  fmt.Fprintf(w, strings.Split(req.RemoteAddr, ":")[0])
}

func main() {
  http.HandleFunc("/ip", ip)
  http.ListenAndServe(":8222", nil)
}ctrl + cgithub

`package main` default package declaration	`func main() {` declare `main` function that will be launched automatically
`net/http` http package to work with http protocol	`strings.Split(req.RemoteAddr, ":")` extract `IP` from client `IP:PORT` string
`"/ip", ip` handle `/ip` request with `ip()` function	`http.ListenAndServe` launch HTTP server
`8222` port to listen HTTP server on

Usage example

package main
import ( "fmt"; "net/http"; "strings" )

func ip(w http.ResponseWriter, req *http.Request) {
  fmt.Fprintf(w, strings.Split(req.RemoteAddr, ":")[0])
}

func main() {
  http.HandleFunc("/ip", ip)
  http.ListenAndServe(":8222", nil)
}

output

# returns [ip] on "localhost:8222/hi" request

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golangHow to get client IP from HTTP server

Usage example

output

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