Make golang performance test return JSON instead of string

tests/performance/golang/golang.http.go

@@ -1,16 +1,30 @@
 package main
 
 import (
-    "fmt"
-    "os"
-    "net/http"
+	"encoding/json"
+	"net/http"
+	"os"
 )
 
+type TestJSONResponse struct {
+	Test bool
+}
+
 func handler(w http.ResponseWriter, r *http.Request) {
-    fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
+	response := TestJSONResponse{true}
+
+	js, err := json.Marshal(response)
+
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(js)
 }
 
 func main() {
-    http.HandleFunc("/", handler)
-    http.ListenAndServe(":" + os.Args[1], nil)
+	http.HandleFunc("/", handler)
+	http.ListenAndServe(":"+os.Args[1], nil)
 }