fix: add fetch timeout and TCP keepalive to HTTP client#694
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kallebysantos
approved these changes
Apr 21, 2026
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What kind of change does this PR introduce?
Bug fix
What is the current behavior?
The HTTP client does not have a timeout for fetch requests or TCP keepalive settings.
What is the new behavior?
SO_KEEPALIVE). The OS will send keepalive probes after an idle period, detecting and closing dead connections before they cause indefinite hangs. Default idle time is 30s, configurable viaDENO_TCP_KEEPALIVE_SECS.DENO_FETCH_TIMEOUT_SECS(disabled by default).Description
Without TCP keepalive, if a load balancer (e.g. AWS ALB with a 60s idle timeout) silently drops a pooled connection, the client has no way to detect the dead socket and
send().awaitblocks indefinitely. This was observed causing 1h+ hangs in thebundlesubcommand and silent failures when invoking functions from within Edge Functions (ref #678).Context: https://supabase.slack.com/archives/C02KMRX22NR/p1776767117730769?thread_ts=1776681851.847949&cid=C02KMRX22NR