the largest request body the channel can send in one message, or 0 when unknown or
unlimited: the server's maxMessageSize and maxChunkCount with every chunk's headers,
signature and padding already paid for. A client packing many items into one request
budgets against this rather than against maxMessageSize alone, which over-fills a
message by exactly those per-chunk bytes and is refused with BadTcpMessageTooLarge.
the largest request body the channel can send in one message, or 0 when unknown or unlimited: the server's maxMessageSize and maxChunkCount with every chunk's headers, signature and padding already paid for. A client packing many items into one request budgets against this rather than against maxMessageSize alone, which over-fills a message by exactly those per-chunk bytes and is refused with BadTcpMessageTooLarge.