This is an information about the transfer(Download/Upload) speed that will be sent across tasks.
It is useful to get the transfer speed and displayed it according to
user’s application.
Collector::File(FileInfo) is used to be able to download and upload files.
Collector::Ram(Vec<u8>) is used to store response body into Memory.
Collector::RamWithHeaders(Vec<u8>, Vec<u8>) is used to store response body into Memory and with complete headers.
Collector::FileAndHeaders(FileInfo, Vec<u8>) is used to be able to download and upload files and with complete headers.