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Thanks, I didn't know Brotli! Indeed it seems to include a dictionary in its compression which seems to help significantly with small pages. I hope compression continues to improve in this way.

> To my understanding, that static table in HTTP2 is directly in context of recommending and discussing Brotli compression

It seems separate, that would be a header compression for HTTP2 header itself, while Brotli encodes content (usually html, css or js).

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The header compression in http2 has atypical requirements placed upon it: contents of different headers in a single request must not impact each other's compressed size[^], lest an attacker able to manipulate one of them can use that to guess the other. Thus, LZ77-style compression is out of the window, as well as using Huffman codes selected based on _all_ the header values. In essence, each header value (in a single request) has to be compressed independently. IIUC the dictionary you reference is used for header keys (as opposed to values).

[^] this statement is a bit of a lie for reasons of simplification

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