Dns overrides with a function

[niuhuan]

Can overrides dns with a function

reqwest::ClientBuilder::new()
    .resolve_fn(move |domain| {
        if Regex::new(r"(.+\.)?abc\.com")
            .unwrap()
            .is_match(domain.as_str())
        {
            Some("1.2.3.4:443".parse().unwrap())
        } else {
            None
        }
    })
    .build()
    .unwrap();

[niuhuan]

Implement #1125
Dear @seanmonstar , I finished it as the issue poster said, only adding some necessary code to keep it clean, is this OK?.

[timokoesters]

We're using these changes in conduit.rs without any problems.

[niuhuan]

We're using these changes in conduit.rs without any problems.

Maybe not merge. author has not discussed it. 😛

[ShadowJonathan]

Why was this closed?

Edit: ah, there's another PR

[niuhuan]

#1653

I think asynchronous parsing is more popular, I'm learning to use it.