The RFC touches on that issue: > In order to protect the decoder from unreasonable memory requirements, a decoder is allowed to reject a compressed frame that

The RFC touches on that issue: > In order to protect the decoder from unreasonable memory requirements, a decoder is allowed to reject a compressed frame that requests a memory size beyond the decoder's authorized range. > For broader compatibility, decoders are recommended to support memory sizes of at least 8 MB. This is only a recommendation; each decoder is free to support higher or lower limits, depending on local limitations. As a corollary, and in the absence of an explicit negotiation process between client and server, servers should probably avoid using a window larger than 8 MB.