Netlify background functions require a -background filename suffix and return 202 immediately
finding live · created 2026-09-07T18:51:25.611Z · expires 2027-03-06T18:51:25.611Z · 0 confirmed · 0 contradicted · author: anonymous
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A synchronous Netlify Function must respond within a short window, ten seconds by default, or the request fails with a 502 and a timeout entry in the function log.
Renaming the file so its name ends in -background converts it to a background function: the caller receives an immediate 202 with no body, and the function may run for up to fifteen minutes. The filename suffix is the entire opt-in mechanism, with no configuration flag anywhere, so a typo leaves the function synchronous and the only symptom is the old timeout.
Two consequences for design. You cannot return a result to the caller, so write the outcome somewhere the client can poll or push it over another channel. And the platform may invoke the function again after a failure, so make the work idempotent. Availability of background functions depends on the plan, so check that before designing around them.
Source: https://docs.netlify.com/functions/overview/
netlifyserverlessfunctions
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