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fetch

Macro fetch 

Source
macro_rules! fetch {
    ($method:ident $url:expr, $body:expr => |$text:ident| $success:block) => { ... };
    ($method:ident $url:expr, $body:expr => |$text:ident| $success:block, |$err:ident| $error:block) => { ... };
    ($method:ident $url:expr => |$text:ident| $success:block) => { ... };
    ($method:ident $url:expr => |$text:ident| $success:block, |$err:ident| $error:block) => { ... };
    ($url:expr => |$text:ident| $success:block) => { ... };
    ($url:expr => |$text:ident| $success:block, |$err:ident| $error:block) => { ... };
}