Awesome, thank you so much!!

Curious: with Redis in separate console, but without graphviz (I forgot about it initially), I got "Internal server error" and:

$ go run -v ./gddo-server/
WARN[01-19|21:30:12] failed to load configuration file        error="Config File \"gddo\" Not Found in \"[/home/akavel/prog/gddo /etc]\""
DBUG[01-19|21:30:12] config values loaded                     values="map[assets:/home/akavel/prog/gddo/gddo-server/assets config: crawl_interval:0s db-idle-timeout:4m10s db-log:false db-server:redis://127.0.0.1:6379 default_goos: dial_timeout:5s first_get_timeout:5s get_timeout:8s github_interval:0s http::8080 max_age:24h0m0s memcache_addr: pg-server: request_timeout:20s robot:100 sidebar:false trace_fraction:0.1 trace_max_qps:5 trust_proxy_headers:false]"
2021/01/19 21:30:34 web   fetch: 2190 put: 8-88516fde4023aafa335f8da0a12a95bab0f8033a github.com/akavel/up
2021/01/19 21:30:37 Error serving /github.com/akavel/up?import-graph: exec: "dot": executable file not found in $PATH

on the console, but once I installed graphviz (edit: and started the server again), I can see the graph rendered successfully.

Do you have any hints or working notes as to how to set up the environment? E.g. I know basically nothing about Redis.

Hm; given that ImportGraph seems to also use Redis, and the "Internal error" message I got is rather spartan, it's not currently clear to me how I could further help debugging this without access to the infrastructure. Still, as a quick check that could still hopefully tell us a bit more, is there a chance you could be able to find some corresponding message in the server logs, matching the URL I listed in the OP of the issue?

Interesting!

It shells out to dot. My initial guess would be that maybe you don't have graphviz installed in the container/jail/machine/...? If you don't want to do that (I didn't yet explore what are the limits on throttling on this feature), I would think offloading this to JS/WASM could be acceptable.

edit: FWIW, as I suspected, there seem to be some JS/WASM ports of graphviz available in case you'd prefer that approach.

https://godocs.io/github.com/akavel/up?import-graph shows Internal server error. Is there a chance you might enable this feature in some form? That's a feature I'm personally painfully missing on pkg.go.dev, and was really hoping to see resurrected on godocs.io

IIUC, u2f/WebAuthn probably requires some basic JS to work (at the moments the token needs to be accessed). Would that be OK for the site, given its no JS architecture?