dont parse strings without tld as uri

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"embed"
+	"errors"
 	"flag"
 	"fmt"
 	"html/template"
@@ -106,6 +107,10 @@ func search(w http.ResponseWriter, r *http.Request) {
 }
 
 func ParseURI(uri string) (*url.URL, error) {
+	if !strings.ContainsRune(uri, '.') {
+		return nil, errors.New("no top level domain")
+	}
+
 	if !strings.HasPrefix(uri, "http://") && !strings.HasPrefix(uri, "https://") {
 		uri = "https://" + uri
 	}