chore(examples): Call Routes::prepare

[tottoto]

Calls Routes::prepare in examples.

[djc]

Why? What does it do/why is it valuable? If it works without it, it looks like pure noise.

[tottoto]

No, it is not noise. This is recommended because it uses axum's router internally. Examples should show how it should be used.

[djc]

You haven't answered my question. I mean "noise" not in a disparaging but in a technical sense, as in, code that is unnecessary (since it apparently compiles just fine without it). So why is it better to call prepare() on these?

[tottoto]

I think I have already answered all of your question. According to your comment it appears that you believe that examples should be judged solely on whether they compile, but I do not agree. Even if the code can be compiled without a certain step being done, when that step is recommended it should be showed in the example. My opinion is that one of the role of examples is to show recommended usage of the APIs, not just to make them compile.

So why is it better to call prepare() on these?

As I have already answered, this is because tonic uses axum internally as library and this processing is recommended by axum in the use case of tonic doing. Therefore, tonic's router inherits axum's recommendation and also recommends users to run this process. It is not necessary but recommended.

[djc]

Okay, can you link that recommendation here? Essentially I'm asking why Axum recommends this.

[tottoto]

https://docs.rs/axum/0.7.5/axum/routing/struct.Router.html#a-note-about-performance