Unable to access VSCode behind inverse proxy

[gogasca]

• Web Browser: Chrome 87 or Firefox
• Local OS: MacOS
• Remote OS: Ubuntu 1804
• Remote Architecture: Google Cloud
• code-server --version: 3.8.0 c4610f7

Problem description:

When I try to access VSCode behind an inverse Proxy, I get a blank page. If I select "View source" in the blank page, I do see HTML. Not sure if its related to websockets or any other configuration.

[2021-01-19T09:27:24.443Z] info  Using user-data-dir /var/lib/code-server
[2021-01-19T09:27:24.464Z] info  Using config file ~/.config/code-server/config.yaml
[2021-01-19T09:27:24.464Z] info  HTTP server listening on http://0.0.0.0:8081 
[2021-01-19T09:27:24.464Z] info    - Authentication is disabled 
[2021-01-19T09:27:24.464Z] info    - Not serving HTTPS 
[2021-01-19T09:27:48.587Z] debug forking vs code...
[2021-01-19T09:27:49.041Z] debug setting up vs code...
[2021-01-19T09:27:49.043Z] debug vscode got message from code-server {"type":"init"}
[2021-01-19T09:28:17.487Z] debug setting up vs code...
[2021-01-19T09:28:17.489Z] debug vscode got message from code-server {"type":"init"}
[2021-01-19T09:28:18.448Z] debug vscode got message from code-server {"type":"socket"}
[2021-01-19T09:28:18.548Z] debug vscode New connection {"token":"8fc9eda5-401e-4bda-b67b-90c649b132b6"}
[2021-01-19T09:28:18.676Z] warn  vscode Cannot read property '0' of undefined
[2021-01-19T09:28:18.680Z] warn  vscode Cannot read property '0' of undefined

Topology:

My URL is something like this: https://dc49045da149f3f-x.y.z.com

HTTPS -> HTTP
Browser <---> HTTPS Proxy <---> [ Proxy Agent Docker <---> VM with Vscode 3.8 ]

Tested:
Without Proxy: Browser <---> [ VM with Vscode 3.8 ] Works
Without Proxy Agent: Browser <---> Proxy <---> [ VM with Vscode 3.8 ] Fails

Proxy:
https://github.com/google/inverting-proxy

In Browser:

INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] starting reconnecting loop. You can get more information with the trace log level.
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] waiting for 5 seconds before reconnecting...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] resolving connection...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] connecting to dc49045da149f3f-x.y.z.com:80...
log.ts:185  INFO [remote-connection][Management   ][8fc9e…][reconnect] reconnected!

Should I configure an extra setting in VSCode with my external URL ?
Any pointers are appreciated.

In View Source:

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  <script>
    require(["vs/code/browser/workbench/workbench"], function () {})
  </script>
</html>

[code-asher]

If you can I'd recommend using `code-server --link`. That uses our own "inverting proxy" and handles everything for you. As for the issue here, it does look like it's having trouble with websockets. Are you using App Engine? The proxy readme says there are extra steps to get websockets working there: https://github.com/google/inverting-proxy#limitations

[gogasca]

Thanks for replying, I'm using a Google internal version of the inverting Proxy. This version provides a shim.

I was curious if the Code Server is expecting some specific headers or require additional configuration if its behind a Proxy:
For example remoteAuthority and authority fields.

<!-- Workbench Configuration -->
    <meta id="vscode-workbench-web-configuration" data-settings='{"remoteAuthority":"dc49045da149f3f-x.y.z.com","logLevel":1,"workspaceProvider":{"payload":[["userDataPath","/var/lib/code-server"],["enableProposedApi","[]"]]},"homeIndicator":{"href":"https://github.com/cdr/code-server","icon":"code","title":"Home"}}' />

or

<meta id="vscode-remote-user-data-uri" data-settings='{"$mid":1,"path":"/var/lib/code-server","scheme":"vscode-remote","authority":"dc49045da149f3f-x.y.z.com"}' />