Since WhatsApp sends binaries (images, documents like PDFs, probably Zip files as well), I wonder if this proxy also encodes the data as binaries. It recompress

Since WhatsApp sends binaries (images, documents like PDFs, probably Zip files as well), I wonder if this proxy also encodes the data as binaries. It recompresses JPEGs though, although there is an option to turn that off, and in any case the recompression probably happens client (sender) side.