HTML

http code 206

206 Partial Content

206 status code

206 - The server in question has completed a partial HTTP Get request
and sent the requested part of the file to the user 
or has fulfilled a range request in the case of multiple files.

//https://www.belugacdn.com/blog/cdn/206-partial-content-error/
//https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/206