very strange POST requests

[kino]

when I run mta sa, the client sends encrypted data to the server, what is it? neither in sources nor in a config found nothing similar to these addresses. below in spoiler are request headers

 

Spoiler

				
			POST /sa/db/up52b/ HTTP/1.1
		Host: updatesa.multitheftauto.com
		User-Agent: MTA:SA
		Accept: */*
		Accept-Encoding: deflate, gzip
		Content-type: application/octet-stream
		Content-Length: 459
		 				
			POST /sa/db/up30b/ HTTP/1.1
		Host: updatesa.multitheftauto.com
		User-Agent: MTA:SA
		Accept: */*
		Accept-Encoding: deflate, gzip
		Content-type: application/octet-stream
		Content-Length: 402
		 				
			

 

[Jusonex]

It's not encrypted, it's just compressed and checks if there are any updates available for the auto-updater.