Afaik XHR allows you to access received data in a streaming fashion, but the XHR type will always buffer the full received payload internally. So if you try to

Afaik XHR allows you to access received data in a streaming fashion, but the XHR type will always buffer the full received payload internally. So if you try to stream a large amount of data over it you will eventually run out of memory. If you want to consume a potentially endless stream with custom encoding you need the fetch API with streaming support for that (https://developer.mozilla.org/en-US/docs/Web/API/Streams_API/Using_readable_streams#Consuming_a_fetch_as_a_stream https://developer.mozilla.org/en-US/docs/Web/API/Streams_API...), as far as I understood. Or websockets. That is one reason that e.g. gRPC streaming support doesn't work trivially in browsers.