Method clone

http/src/http.rs:207–212

(&self)

    B: Clone,
{
    fn clone(&self) -> Self {
        Self {
            body: self.body.clone(),
            ext: Extension(Box::new(_Extension::clone(&*self.ext.0))),
        }
    }
}

// a separate extension type contain information can not be carried by http::Request. the goal is