local gigipan images

set up

install dependancies

$ npm i

run the server

$ npm run server-dev

open example html file in browser

$ open example/example.html

explanation

• all requests to gigapan have been routed to localhost:4000 (see https://github.com/mapstertech/bbc-gigapan/blob/master/example/gigapan_core_min.js#L1994)
• in the express server we check to see if the image requested has been downloaded and saved before
• if it has, send it right away to the client
• if not fetch it from gigapan servers and download it to this server for future requests