axum 0.8 and wildcard *

[frederikhors]

With axum before 0.8 I was using this:

Router::new().route(
    &format!("{}/*value", conf.API_PREFIX),
    get(something),
);

Now it says me:

Path segments must not start with `*`.
For wildcard capture, use `{*wildcard}`.
If you meant to literally match a segment starting with an asterisk, call `without_v07_checks` on the router.

What does it mean?

Where should I write {*wildcard}?

I opened an issue because I think we should update docs and errors.

[mladedav]

Instead of

Router::new().route(
    &format!("{}/*value", conf.API_PREFIX),
    get(something),
);

use

Router::new().route(
    &format!("{}/{{*value}}", conf.API_PREFIX), // Double `{{` and `}}` so that `format!` leaves literal `{` and `}` there
    get(something),
);

Router::route already has a section on wildcards and I'm not sure how to make it clearer.

I'm also not sure how to rephrase the error message. I guess we could write the full segments there, i.e. instead of "segment starting with *" we might write "segment *value" and instead of {*wildcard} we could write {*value} in your specific case. Do you think that would help or do you have something else in mind?