add /kitty route to get a cat picture from CaaS

app.rb

@@ -14,6 +14,8 @@ require "anyflake"
 
 require "jwt"
 
+require "httparty"
+
 $LOAD_PATH.unshift File.dirname(__FILE__) + "/lib"
 
 require "config"
@@ -495,3 +497,21 @@ get "/bytes/:size" do
 
   generate_bytes(Integer(n))
 end
+
+get "/kitty" do
+  caas_host = ENV.fetch "CAAS_SERVICE_HOST"
+  caas_port = ENV.fetch "CAAS_SERVICE_PORT"
+  url = "http://#{caas_host}:#{caas_port}/"
+  response = HTTParty.head(url)
+  content_type response.headers["content-type"]
+  stream do |out|
+    response = HTTParty.get(url, stream_body: true) do |fragment|
+      if [301, 302].include? fragment.code
+      elsif fragment.code == 200
+        out << fragment
+      else
+        raise StandardError, "non-success status code while streaming #{fragment.code}"
+      end
+    end
+  end
+end