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Golang: HTTP Server
// Signature func HandleFunc(pattern string, handler func(ResponseWriter, *Request))
func main() {
http.HandleFunc("/ping", func(w http.ResponseWriter, r *http.Request) {
// Method #1
w.Write([]byte("hello from w.Write"))
// Method #2
io.WriteString(w, "hello from io.WriteString")
// Method #3
fmt.Fprintf(w, "hello from fmt.Fprintf")
})
http.ListenAndServe(":8080", nil)
}To test, you can run:
curl localhost:8080/ping
It should response one of the three methods (or all three).
UPDATE:
Before Golang version 1.22, you only can define “path” as the first argument of http.HandleFunc.
But, starting from Golang version 1.22 the pattern becomes:
[METHOD ][HOST]/[PATH]
Please check here for more information about the new pattern https://pkg.go.dev/net/http#hdr-Patterns.
References:
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