The HTTP/2 protocol is a replacement for HTTP which is focused on improving performance. The target of the improvements was mainly end-user perceived latency and network and server resource usage.
The Web Area running the embedded web rendering engine in 64 Bit 4D supports the HTTP/2 protocol.
Below is a site to test for HTTP/2 support:
Opening the URL in 64 Bit 4D running the embedded web rendering engine:
Opening the URL when the web client does not support HTTP/2:
Thus it can be beneficial in terms of consistency and performance to use the Blink based embedded web rendering engine.