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fix(canton): per-service HTTP protocol selection with h2 -> HTTP/1.1 auto-fallback - #490
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The Canton SDK pinned
httpVersion: 2for all Canton services, but only the hosted validator front-ends require HTTP/2 (their ELB rejects 1.1 with 464) β Canton's own JSON Ledger API is documented HTTP/1.1, and user-hosted EDS instances commonly serve 1.1 only.This adds
httpVersion: 1 | 2 | 'auto'to the Canton, EDS, transfer-instruction, and token-metadata clients.'auto'tries HTTP/2 first and retries the same request over HTTP/1.1 on a protocol-level failure (ERR_HTTP2_ERROR/ERR_HTTP2_STREAM_CANCEL), memoized per origin.Defaults preserve current behavior:
2for the Ledger API client,'auto'for EDS/transfer-instruction/token-metadata.