diff --git a/app.rb b/app.rb
index 3aab406..6f44ffc 100644
--- a/app.rb
+++ b/app.rb
@@ -470,6 +470,14 @@ get "/_cat/config" do
   end
 end
 
+get "/_cat/pid" do
+  stream do |out|
+    {ppid: ppid, pid: Process.pid}.sort.each do |k, v|
+      out << "#{k}=#{v}\n"
+    end
+  end
+end
+
 route :delete, :get, :patch, :post, :put, "/status/:code" do
   # hello
   code = Integer(params[:code])