filestore acts as a proxy between the CLSIs and (currently) Amazon S3 storage, presenting a RESTful HTTP interface to the CLSIs on port 3009 by default. Urls are mapped to node functions in https://github.com/sharelatex/filestore-sharelatex/blob/master/app.coffee . URLs are of the form:
*`/project/:project_id/file/:file_id`
*`/template/:template_id/v/:version/:format`
*`/project/:project_id/public/:public_file_id`
*`/project/:project_id/size`
*`/bucket/:bucket/key/*`
*`/heapdump`
*`/shutdown`
*`/status` - returns `filestore sharelatex up` or `server is being shut down` (HTTP 500)