How to support Ipv6 wildcard by using with_host config.

[jackymao]

Hi,

First of all, thank you very much for making this great framework/platform. After reading the wonderful guide on trillium.rs and the examples code, it feels amazing that it is really concise and also powerful, and extendable with the State, Conn, Handler concept.

I have tried trillium for some days and am quite happy with its straightforward on things likes router, cookie/session, Askama template support, and the proxy is a great experience. I have also tried to work with OAuth2 and it works very well. Also to use with Casbin and get RBAC (Role-based access control) works fine. All these are so good that it just works.

As said if you like trillium then using it. I made a website and try to deploy it to fly.io. There is an example app from Fly.io using warp and I am trying to make it works with trillium. It is required to bind to all address by ([0,0,0,0,0,0,0,0], 8080) as ref: https://github.com/fly-apps/hello-rust. I meet problem here that I try as below:

trillium_smol::config()
    .with_port(8080)
    .with_host("0.0.0.0")  // no matter 4 zeros or 6 zeros or 8 zeros
    .run(handler)

this is ok on local dev but can't up on fly.io. I don't know if it is an issue about the IPv6 wildcard.

Would you please help check this and see what I can do on this. Many thanks.

[jbr]

Thanks for using trillium! I believe that 0,0,0,0,0,0 is the same as std::net::Ipv6Addr::UNSPECIFIED which is parsed as "::" — so if you set host to "::", I believe that it should correctly bind to 0,0,0,0,0,0

If that does work, please let me know and I'll add a note to the documentation, because it's not at all obvious

[jackymao]

Thanks for your prompt reply. It is a surprise when seeing the reply in less than 5 minutes after I post this discussion. Amazing.

I have tried with_host("::") and it works.

And finally I found the problem is on deploying process that is regarding health check, not coding problem. Actually both with_host("0.0.0.0") and with_host("::") are working, while one is for IPv4 and the other is for both IPv4 and IPv6 in my case at fly.io.

Thanks again for your help. And I will report here if any other discussion on trillium.

[jackymao]

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update (2021-08-03):
Sorry but have to report an exception that on my another local Win7 dev computer (can't visit IPv6 website):

• with_host("0.0.0.0"): I can visit the site locally with localhost:8080 and 127.0.0.1:8080
• with_host("::"): localhost:8080 is OK, but 127.0.0.1:8080 not working.

So maybe fly.io have some special setting on the IPv6 & IPv4 service.
Is there a way to have the with_host("0.0.0.0") and with_host("::") double setting?

[jbr]

Currently, the way to support that would be to use the HOST environment variable to customize the deployments. You should be able to use the default configuration (trillium_smol::run(…)) with HOST="::" or with no setting at all to bind to localhost in development. It looks like https://fly.io/docs/reference/configuration/#the-env-variables-section would be the way to provide HOST="::" for fly.io

[jackymao]

Appreciate that you spend time on this and even check the fly.io document.

Currently with_host("::") on fly.io works very well for both IPv4 and IPv6. And now with_host("0.0.0.0") can up and running also and is fairly good for me. On local development, with_host("0.0.0.0") is also satisfied my requirement.

Thank you so much for your kindly help!

Have a nice day.