stream caas file in chunks

app.rb

@@ -20,6 +20,7 @@ $LOAD_PATH.unshift File.dirname(__FILE__) + "/lib"
 
 require "config"
 
+CHUNK_SIZE = 1024**2
 SESSION_SECRET_HEX_LENGTH = 64
 JWT_SECRET_HEX_LENGTH = 64
 
@@ -506,7 +507,7 @@ get "/kitty" do
     # fail-safe url
     url = "https://i.imgur.com/epzPw7L.jpeg"
   end
-  path = Tempfile.open binmode: true do |f|
+  tmp_file = Tempfile.open binmode: true do |f|
     # f.chmod 0o644
     response = HTTParty.get(url, stream_body: true) do |fragment|
       if [301, 302].include? fragment.code
@@ -519,8 +520,15 @@ get "/kitty" do
     end
 
     content_type response.headers["content-type"]
-    f.path
+    f
+  end
+
+  tmp_file.open do |f|
+    stream do |out|
+      out << f.read
+      until f.eof?
+        out << f.read(CHUNK_SIZE)
+      end
+    end
   end
-  send_file path
-  File.delete path
 end