add http package

http/http.go

@@ -0,0 +1,14 @@
+// Package http includes handlers and utilties.
+package http
+
+import "net/http"
+
+// JSONVersionHandler returns a simple JSON response from a version string.
+// The returned JSON is in the form of `{"version":"v0.0.1"}`.
+func JSONVersionHandler(version string) http.HandlerFunc {
+	bodyBytes := []byte(`{"version":"` + version + `"}`)
+	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.Write(bodyBytes)
+	}
+}