message: Replace unwrap with expect
diff: @@ -119,7 +119,7 @@ fn preview_request(
  for header in &parts.headers {
  let (name, value) = header;
  let forward_header = format!("{}{}", HEADER_PREFIX, name);
  - let header_name = HeaderName::from_bytes(forward_header.as_bytes()).unwrap();
  + let header_name = HeaderName::from_bytes(forward_header.as_bytes()).expect(&format!("Could not create header name for {}", name));
  headers.insert(header_name, value.clone());
  }
  parts.headers = headers;
  