diff --git a/app/models/http_proxy.rb b/app/models/http_proxy.rb
index 1cb27e8c3136..8302a47bb0b8 100644
--- a/app/models/http_proxy.rb
+++ b/app/models/http_proxy.rb
@@ -34,6 +34,7 @@ class HttpProxy < ApplicationRecord
 
   def full_url
     uri = URI(url)
+    fail URI::InvalidURIError unless uri.is_a?(URI::HTTP)
     if username.present?
       uri.user = CGI.escape(username)
       uri.password = CGI.escape(password) if password