elixir-mint / mint / 71dd92574937e40985a85faaadf7fbe059773302

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Apply the acknowledged HTTP/2 header table size to the decoding table (#508)

* Apply the acknowledged HTTP/2 header table size to the decoding table

put_settings/2 accepted :header_table_size but the handler for the
server's SETTINGS ACK didn't know the setting and raised a RuntimeError
out of stream/2. The setting is now recorded and the HPACK decoding
table's permitted maximum follows it.

That maximum is a limit rather than the size of the table. The table's
own maximum belongs to the server's encoder, which declares it with a
dynamic table size update (RFC 7541 4.2), so HPAX.resize/2, which moves
both, would keep entries the server had evicted and decode an indexed
reference to one of them as a stale header.
HPAX.protocol_resize/2 moves only the limit and follows it down when it
drops below the size the encoder declared. After a reduction the server
has to declare its new size at the start of the next field block, which
RFC 9113 4.3.1 requires the client to enforce, so a block that doesn't
is a connection error with COMPRESSION_ERROR.

* Require hpax 1.1

HPAX.protocol_resize/2 was added in hpax 1.1.0, so older versions can't
be used anymore.

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