Not working with docker and dory

I followed the docker-dev-setup.sh guide and had canvas docker dev environment up. However, the rce-api is not working. Logs below. It seems that the rce-api cannot resolve the canvas.docker address, while the host's browser can.

rce-api_1   | 172.23.0.6 - - [29/Apr/2020:05:10:56 +0000] "GET /api/session HTTP/1.1" 304 0 "http://canvas.docker/courses/1/pages" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0" 
rce-api_1   | App 40 output: [42cc31eb-2e58-4b8c-af52-00cb0d96689d] 127.0.0.1 - - [29/Apr/2020:05:10:56 +0000] "GET /api/session HTTP/1.1" 304 - "http://canvas.docker/courses/1/pages" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0" 
rce-api_1   | App 40 output: (node:40) UnhandledPromiseRejectionWarning: RequestError: Error: getaddrinfo ENOTFOUND canvas.docker canvas.docker:80 
rce-api_1   | App 40 output:     at new RequestError (/usr/src/app/node_modules/request-promise-core/lib/errors.js:14:15) 
rce-api_1   | App 40 output:     at Request.plumbing.callback (/usr/src/app/node_modules/request-promise-core/lib/plumbing.js:87:29) 
rce-api_1   | App 40 output:     at Request.RP$callback [as _callback] (/usr/src/app/node_modules/request-promise-core/lib/plumbing.js:46:31) 
rce-api_1   | App 40 output:     at self.callback (/usr/src/app/node_modules/request/request.js:185:22) 
rce-api_1   | App 40 output:     at Request.emit (events.js:198:13) 
rce-api_1   | App 40 output:     at Request.onRequestError (/usr/src/app/node_modules/request/request.js:881:8) 
rce-api_1   | App 40 output:     at ClientRequest.emit (events.js:198:13) 
rce-api_1   | App 40 output:     at Socket.socketErrorListener (_http_client.js:401:9) 
rce-api_1   | App 40 output:     at Socket.emit (events.js:198:13) 
rce-api_1   | App 40 output:     at emitErrorNT (internal/streams/destroy.js:91:8) 
rce-api_1   | App 40 output:     at emitErrorAndCloseNT (internal/streams/destroy.js:59:3) 
rce-api_1   | App 40 output:     at process._tickCallback (internal/process/next_tick.js:63:19) 
rce-api_1   | App 40 output: (node:40) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2) 

I have a workaround here: https://github.com/FreedomBen/dory/issues/36

I'd like to know what did you do to make it work? I don't see any documentation about this issue.

Start with the docker-dev-setup.sh guide and the reported Dory workaround at dory/issues/36. Reproduce the rce-api failure and inspect why the container cannot resolve canvas.docker while the host browser can; done means the Docker development setup works without the reported DNS error or documents the required configuration.