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* fix(storage): omit unsigned headers from SigV4 to support GCS S3 XML API Google Cloud Storage through its S3-compatible XML API mutates the Accept-Encoding request header in transit (identity -> identity,gzip(gfe)). Because aws-sdk-go-v2 signs Accept-Encoding into SignedHeaders by default, this mutation causes HTTP 403 SignatureDoesNotMatch on storage calls. This commit: - Automatically excludes accept-encoding from SigV4 signing when AWS_ENDPOINT_URL points to Google Cloud Storage (storage.googleapis.com). - Adds S3_UNSIGNED_HEADERS to configure additional unsigned headers, preserving accept-encoding when targeting GCS. - Strips unsigned headers prior to SigV4 signing while restoring captured headers (including Accept-Encoding: identity) on the wire via an HTTP client wrapper. - Documents S3_UNSIGNED_HEADERS across all 5 documentation translations (en, zh, ja, ko, fr) with an integrity protection note. - Adds regression tests for SigV4 omission, wire transmission, and presigned X-Amz-SignedHeaders. Closes #9509 * fix(storage): scope GCS signing workaround to Accept-Encoding (MUL-8232) Co-authored-by: multica-agent <[email protected]> --------- Co-authored-by: Sol-Boy <[email protected]> Co-authored-by: multica-agent <[email protected]>