Spoofing the TLS ClientHello (JA3/JA4) alone is no longer enough for Akamai Bot Manager v3 or DataDome. They inspect the exact byte order of your **HTTP/2 `SETTINGS` frame**, initial `WINDOW_UPDATE` increment, and pseudo-header order (`:method`, `:authority`, `:scheme`, `:path`). ### Browser Pseudo-Header Signatures: - **Chrome 128+**: `:method, :authority, :scheme, :path` (`HEADER_TABLE_SIZE=65536, ENABLE_PUSH=0, INITIAL_WINDOW_SIZE=6291456`) - **Firefox 130+**: `:method, :path, :authority, :scheme` - **Standard Go/Python `httpx`**: `:method, :scheme, :authority, :path` -> **INSTANT 403 BLOCK!** Always match your HTTP/2 frame configuration 1:1 with the `User-Agent` and `sec-ch-ua` headers you send.