How to convert HeaderMap from actix-web to reqwest since v0.12.x

[yutian1224]

Previously, could just use the request.headers().into() to adapt.
Now when try to traversal and HeaderMap::new()a new reqwest headermap to convert, the following situation will occur. How to solve it?

let mut new_headers = HeaderMap::new()
for (header_name, header_value) in request.headers() {
  new_headers.insert(
    header_name.as_str(),
    ReqwestHeaderValue::from_bytes(header_value.as_bytes()).unwrap(),
  );
}

borrowed data escapes outside of function