Add retry logic for HTTP fetcher#952

Draft

roger2hk wants to merge 19 commits into

transparency-dev:mainfrom

roger2hk:fetcher-retry

Commits on May 12, 2026

Handle non-positive Retry-After values by defaulting to minimal duration
roger2hk
committed
Expand transient network error detection and handle read errors in fetcher
roger2hk
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Adjust retry loop to correctly perform maxRetries attempts plus the initial request
roger2hk
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Limit response body drainage to 4KB to prevent hangs on large inputs
roger2hk
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Update fetcher to support RFC 850 and ANSI C date formats for Retry-After header
roger2hk
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Cap retry delay at maxBackoff to prevent excessively long waits
roger2hk
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Treat io.EOF as a retryable error in fetcher
roger2hk
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Adjust retry logic to correctly propagate the final error and last result after exhausted attempts
roger2hk
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Exclude context cancellation and deadline errors from transient network error check
roger2hk
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Add jitter to backoff duration in fetcher retry logic
roger2hk
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Prevent panic in backoff jitter calculation when backoff is zero
roger2hk
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Adjust backoff calculation
roger2hk
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Return error when Retry-After duration exceeds maxBackoff instead of capping it
roger2hk
committed