decode url in query-string GET

todo: install target for nginx and systemd files

index.html

@@ -44,7 +44,11 @@ A Minimal, SQLite-Backed URL Shortener
 |   $ curl {{.URL}}/ddg?https://duckduckgo.com
 |   {{.URL}}/ddg
 |
-| 5. Deleting a short link
+| 5. You can also pass an encoded URL:
+|   $ curl {{.URL}}?https%3A%2F%2Fduckduckgo.com
+|   {{.URL}}/1dc4cb37e81de396
+|
+| 6. Deleting a short link
 |   $ TMP=$(mktemp)
 |   $ # temp file will store header
 |   $ LINK=$(curl -sS {{.URL}} -d https://duckduckgo.com -D $TMP)

main.go

@@ -171,7 +171,11 @@ func (c controller) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 
 	case http.MethodGet:
         st := strings.TrimRight(r.URL.Path, "/")
-        rq := r.URL.RawQuery
+        rq, err := url.QueryUnescape(r.URL.RawQuery)
+        if err != nil {
+            c.Err(rw, r, err)
+            return
+        }
         if rq != "" {
             u, err := url.Parse(rq)
             if err != nil {