Request.user_agent will crash when send lot of request

[alex8224]

normally, It works well.

http_request_handler!(ngx_http_hello_world_handler, |request: &mut Request| {

    // Ignore client request body if any
    if !request.discard_request_body().is_ok() {
        return HTTP_INTERNAL_SERVER_ERROR.into();
    }

    // Create body
    let user_agent = request.user_agent(); //will crash 
    let uri = request.uri(); 

but if I send too many requests ,It will crash, error.log will output lot error logs as below

2022/05/28 23:03:39 [alert] 18733#0: worker process 20181 exited on signal 11
2022/05/28 23:03:39 [alert] 18733#0: worker process 20182 exited on signal 11
2022/05/28 23:03:39 [alert] 18733#0: worker process 20183 exited on signal 11
2022/05/28 23:03:39 [alert] 18733#0: worker process 20184 exited on signal 11