this post was submitted on 14 Aug 2023
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Lemmy Support

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Initial Docker setup error: SyntaxError: JSON.parse unexpected end of data (lemmy.ca)
submitted 1 year ago by tootbrute@lemmy.ca to c/lemmy_support@lemmy.ml
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I have been struggling with getting a docker setup of lemmy running on amr64 server and I almost got it going.

docker compose up -d

  • Then i go to my domain.com/setup and try to make my first admin user.
  • When I click Sign Up, I get an error:

SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data

Server:

VPS, 2 cpu cores, 12 GB ram Ubuntu OS Caddy as reverse proxy, but I left nginx in the docker-compose file

Logs

docker-compose.yml https://pastebin.com/XHUbMKJL

docker compose logs https://pastebin.com/TzZyK1kN

Caddyfile https://pastebin.com/CjJWthSe

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[–] RoundSparrow@lemmy.ml 2 points 1 year ago* (last edited 1 year ago) (1 children)

SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data

This is an error you are getting in your web browser with lemmy-ui? Do you know how to use the console of Firefox or Chrome to look at what API call that error is coming from?

Caddy as reverse proxy, but I left nginx

Could be related to your problem... as lemmy-ui doesn't seem to be talking to the API to get JSON responses. I suggest looking at your proxy logs at the instant you press submit on the form.

[–] tootbrute@lemmy.ca 1 points 1 year ago* (last edited 1 year ago) (1 children)

OK thanks for the tip.

Firefox, F12, debugger

API error: SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data
e https://tw.arkadi.one/static/js/client.js:2
    p https://tw.arkadi.one/static/js/client.js:2
    C https://tw.arkadi.one/static/js/client.js:2
    w https://tw.arkadi.one/static/js/client.js:2
    y https://tw.arkadi.one/static/js/client.js:2
    s https://tw.arkadi.one/static/js/client.js:2

Caddy log

{"level":"error","ts":1692060935.893172,"logger":"http.log.access.log0","msg":"handled request","request":{"remote_ip":"49.159.84.13","remote_port":"41462","client_ip":"IP_REDACTED","proto":"HTTP/2.0","method":"POST","host":"tw.arkadi.one","uri":"/api/v3/user/register","headers":{"Referer":["https://tw.arkadi.one/setup"],"Cookie":[],"Content-Type":["application/json"],"Accept-Encoding":["gzip, deflate, br"],"Dnt":["1"],"Te":["trailers"],"User-Agent":["Mozilla/5.0 (Windows NT 10.0; rv:109.0) Gecko/20100101 Firefox/116.0"],"Origin":["https://tw.arkadi.one"],"Sec-Fetch-Dest":["empty"],"Content-Length":["112"],"Accept-Language":["en-CA,en-US;q=0.7,en;q=0.3"],"Sec-Fetch-Mode":["cors"],"Sec-Fetch-Site":["same-origin"],"Accept":["*/*"]},"tls":{"resumed":false,"version":772,"cipher_suite":4865,"proto":"h2","server_name":"tw.arkadi.one"}},"bytes_read":0,"user_id":"","duration":0.002207562,"size":0,"status":502,"resp_headers":{"Server":["Caddy"],"Alt-Svc":["h3=\":443\"; ma=2592000"]}}

I don't see anything wrong here though it says it is an error. Hmm.

EDIT: Ok one thing that could be wrong is it says the protcol is HTTP/2.0.

I noticed on the troubleshooting page of Lemmy it says

Make sure that websocket is working correctly, by checking the browser console for errors. In nginx, the following headers are important for this:

proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";

So, I am now searching if I can get Caddy to serve HTTP/1.1 for websockets?

[–] RoundSparrow@lemmy.ml 1 points 1 year ago* (last edited 1 year ago) (1 children)

These aren't really what you are looking for in the Firefox console. They tell you the line of code with the error, but not which page has the JSON missing itself.

I notice your server says Lemmy 0.18.0 - the current is 0.18.4 - any reason you are attempting an older version?

/api/v3/user/register

those are the kind of paths you are looking for that can't be reached and your proxy likely isn't forwarding correctly to the lemmy_server Rust app.

[–] tootbrute@lemmy.ca 2 points 1 year ago* (last edited 1 year ago) (1 children)

I am running this on an arm64 server and there isn't an official docker build for arm.

I figured out how to get past that screen.

I added this to my Caddyfile after reading this https://caddy.community/t/caddy-v2-how-to-proxy-websoket-v2ray-websocket-tls/7040/9

tw.arkadi.one {
        import caddy-common
        reverse_proxy   http://localhost:1234

        @websockets {
                header Connection Upgrade
                header Upgrade websocket
        }

        handle @lemmy {
                reverse_proxy @websockets   http://lemmy_lemmy_1:8536
}

I got my instance running. Thanks for the suggestions.

[–] RoundSparrow@lemmy.ml 1 points 1 year ago* (last edited 1 year ago) (1 children)

Lemmy 0.18.x doesn't use websockets that I know, so I'm not sure why this helped.

I mentioned you are trying to use arm on GitHub... https://github.com/LemmyNet/lemmy/issues/3102

[–] tootbrute@lemmy.ca 2 points 1 year ago

Thanks! I was going to post something on the documentation github about my hack. I'm not sure why it worked but adding that worked.

Maybe it is something to do with Caddy and Nginx not working well together?

We really need an ARM build of this though.