Cannot move out of `req` because it is borrowed

Question

I'm playing with Rust and tiny-http. I've created a function in which I'm messing with the headers of request and then sending response:

fn handle_request(req: Request) {
    let headers = req.headers();
    // working with headers
    let res = Response::from_string("hi");
    req.respond(res);
}

It fails with error:

main.rs:41:5: 41:8 error: cannot move out of `req` because it is borrowed
main.rs:41     req.respond(res);
               ^~~
main.rs:27:19: 27:22 note: borrow of `req` occurs here
main.rs:27     let headers = req.headers();
                             ^~~
error: aborting due to previous error

So I kinda understand that req.headers() accepts &self which performs borrowing req and req.respond() "moves" req since it accepts self. I'm not sure what I should do here, can someone help me understand that?

Answer 1

You have make sure the borrow ends before you move the value. To adapt your code:

fn handle_request(req: Request) {
    {
        let headers = req.headers();
        // working with headers
    }
    let res = Response::from_string("hi");
    req.respond(res);
}

The borrow will only last for the block at the top of the function, so after the end of the block you're free to move res.