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These settings are available in system.settings and are autogenerated from source.

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http_headers_progress_interval_ms

Do not send HTTP headers X-ClickHouse-Progress more frequently than at each specified interval.

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http_headers_read_timeout

Maximum time in seconds to read all HTTP request headers. This is a total deadline for the entire header parsing phase, not a per-read timeout. Protects against slowloris-style attacks where a client trickles header data slowly to hold connections open.
Last modified on July 23, 2026