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Also known as: XFEATURE COMPRESS GZIP, compressed headers
Compressing overview data before sending it, through non-standard extensions such as XZVER or XFEATURE COMPRESS GZIP. Because overview lines are repetitive text, compression ratios of three to five to one are ordinary, cutting the time to build a local header index for a busy binary group from hours to minutes. Only useful to clients that download headers in bulk.
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