Refactor web package into two packages: httpd and webui

httpd/rest.go

@@ -0,0 +1,15 @@
+package httpd
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+// RenderJSON sets the correct HTTP headers for JSON, then writes the specified
+// data (typically a struct) encoded in JSON
+func RenderJSON(w http.ResponseWriter, data interface{}) error {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.Header().Set("Expires", "-1")
+	enc := json.NewEncoder(w)
+	return enc.Encode(data)
+}