package main
import ( "fmt" "log" "net/http" "os")
func ReadUserIP(r *http.Request) string { IpAddress := r.Header.Get("X-Real-Ip") if IpAddress == "" { IpAddress = r.Header.Get("X-Forwarded-For") } if IpAddress == "" { IpAddress = r.RemoteAddr } return IpAddress}
func health(w http.ResponseWriter, r *http.Request) { w.Write([]byte("working"))}
func analyseHeader(w http.ResponseWriter, r *http.Request) { w.Write([]byte("Hello, this is server")) err := os.Setenv("VERSION", "V1.0.0") if err != nil { log.Fatalf("Setting env VERSION failed") } version := os.Getenv("VERSION") w.Header().Set("VERSION", version) fmt.Printf("os version: %s \n", version) // 将request中的header依次copy到response中 for k, v := range r.Header { for _, vv := range v { fmt.Printf("Header key: %s, Header value: %s \n", k, v) w.Header().Set(k, vv) } } fmt.Println(r.RemoteAddr) fmt.Printf("Ip is: %s\n", ReadUserIP(r)) log.Printf("Success! Response code: %d", 200)}
func main() { serveMux := http.NewServeMux() serveMux.HandleFunc("/", analyseHeader) serveMux.HandleFunc("/healthz", health) err := http.ListenAndServe(":8080", serveMux) if err == nil { log.Fatalf("Starting server failed on port 8080 failed") }}
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