how to call fallback when .nest_service does not match

[cppcoffee]

Summary

Version

% cargo tree | grep axum
├── axum v0.6.20
│   ├── axum-core v0.3.4
├── axum-core v0.3.4 (*)
├── axum-extra v0.7.7
│   ├── axum v0.6.20 (*)
│   ├── axum-core v0.3.4 (*)

Crates

axum = { version = "0.6", default-features = false, features = [ "http1", "json", "query", "headers", "ws", "multipart" ] }
axum-extra = { version = "0.7" }
axum-core = "0.3.4"
tower-http = { version = "0.4.0", features = ["fs", "trace"] }

Description

To have axum call a fallback when there is no matching path, simply call the fallback function. However, when .nest_service does not match, it responds with a 404 and does not call the fallback. How can this issue be resolved?

let app = Router::new().nest_service("/", ServeDir::new("/www")).fallback(fallback)

I thought of using axum middleware to handle this, but I don't know how to read the body?

Is there any other way?

axum version

v0.6.20

[mladedav]

You can use something like this:

    let serve_dir = ServeDir::new("assets").not_found_service(ServeFile::new("assets/index.html"));

It's one of the examples in examples/static-file-server.

The issue is that the router matches the nested service (which itself acts as a Router) and it is then responsible for setting fallbacks and such.

[cppcoffee]

I used this method to solve it:

let app = Router::new().nest_service("/", ServeDir::new("/www").call_fallback_on_method_not_allowed(true).fallback(fallback.into_service())).fallback(fallback)