However the dynamic table is shifted along with each new header - that is, the next new header is added with index 62, and the old header in spot 62 now becomes 63. It's a lot quicker to say "See header 62, that I sent you previously", than it is to say "user-agent: Mozilla/5.0 (Macintosh Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/.81 Safari/537.36" again, and again, and again So new headers seen for the first time are added to from index 62. The dynamic table is an extension of the static table but is built up over the connection. It's quicker to say "Use static entry 8", rather than :status: 200. The HPACK static table has 61 commonly used headers and values. This uses a number of techniques to compress the headers, including referencing to a predefined static table, using a dynamic table, and also using Huffman encoding instead of plain ASCII. HTTP/2 header's are compressed with HPACK.
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