diff --git a/app.rb b/app.rb
index 6bd5136..d1ab2c6 100644
--- a/app.rb
+++ b/app.rb
@@ -66,6 +66,9 @@ class App < Roda
         rescue URI::BadURIError
           response.status = 400
           return {message: "invalid url parameter"}.to_json
+        rescue OpenURI::HTTPError
+          response.status = 400
+          return {message: "url not found"}.to_json
         end