Forms that contain structures affected by encoding (such as SocketAddrV4) fail to parse

[lewisclark]

Bug Report

Version 0.4.5
OS: Debian 10 (Linux 4.19.0-10-cloud-amd64 #1 SMP Debian 4.19.132-1 (2020-07-24) x86_64 GNU/Linux)

A Form containing a SocketAddrV4 field is failing to parse input such as 127.0.0.1:80. I'm under the impression that this is because FromFormValue::from_form_value() and subsequently SocketAddrV4::from_str() is being called with the encoded address as a parameter (e.g. 127.0.0.1%3A80) instead of 127.0.0.1:80.

#[derive(FromForm)]
struct Input {
    ip: SocketAddrV4,
}

#[post("/test", data = "<input>")]
fn test(input: Form<Input>) {}

The above code will not parse input such as 127.0.0.1:80 because the colon ':' is encoded. This results in 127.0.0.1%3A80 being passed into FromFormValue::from_form_value() which will fail.