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diamond (she/they) @beehaw.org

Missing CORS prevents third-party web clients

Hey Beehaw mods!

I'm currently working on a Lemmy web client, but the lack of proper CORS headers is preventing anything from working :(

I just wanted to ask if the appropriate CORS headers could be added to the front-facing proxy layer. If you're using Caddy, I believe something like this should do the trick:

 
    
reverse_proxy ... {
  header_down Access-Control-Allow-Origin *
  header_down Access-Control-Allow-Methods *
  header_down Access-Control-Allow-Headers *
}

Relevant issue: https://github.com/LemmyNet/lemmy/issues/3109

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10 comments

    • Websocket handshakes are done over HTTP. The endpoint for Beehaw's WS API would be wss://beehaw.org/, so it's still going to use the same CORS policies as accessing the / (root) path.

        • Huh, interesting. It seems that a WS connection to wss://beehaw.org/api/v3/ws works, but not wss://beehaw.org. I remember reading somewhere that the WS API will eventually be removed, though.

          I'll continue development w/ the REST API until I feel like it's in a mostly-working state, and then I'll probably subject myself to the WS API after. Working with the REST API does feel a lot easier.

            • The websocket needs the right URL or it won’t work, you can’t always assume the websocket endpoint is at the root of the domain.

              Right. I was reading a code snippet from somewhere else where they called into the root path, but the library that they were using probably did the appending in the background which I didn't know.

              That’s annoying, though, because setting up the right CORS headers to allow arbitrary online clients is a pain and I suspect many instance admins won’t do it.

              There is an issue upstream tracking this. For now, I only mostly use Beehaw, so that's fine.

              As a side note, are you implementing the API from scratch? Because there’s a Javascript (Typescript) API that gets auto generated from the Lemmy sources that’s ready to use (supports both REST and WS).

              Nope, I'm using lemmy-js-client. The WS part of it doesn't do much, so I didn't bother using it. The LemmyWebsocket type wasn't also in the main import for some reason, but that wasn't much of an issue.

10 comments