Timeout

You might say

I clicked save and it spins forever, then says the request timed out. Is it the network or the server?

The maximum time to wait for a result before giving up and reporting failureWhen a save action spins and ends in 'Request timed out', the client has reached its wait limit and given up, which does not necessarily mean the request failed to arrive or the server crashed. Diagnosing failures requires distinguishing whether an operation timed out, was rejected by a rate limit, or failed immediately due to invalid inputs.

Know first

HTTP Rate Limit

Change one wait limit and watch this request succeed or fail

Save note

Move the weekly meeting to Thursday afternoon.

The page gave up after reaching the limit

Timeline for this requestThe response arrives at 12s

Limit 3sResponse 12s

The limit comes before the response: the page reports a timeout, but the request was sent and the server may still process and write it later.

A timeout happens only on the waiting side: too short a limit reports false failures, too long a limit keeps users spinning. Find the slow step before choosing a limit.

What happens when a timeout fires

The waiting side gives up: Once the page or tool reaches its wait limit, it stops waiting and reports failure. The request was already sent, and the server may still be processing it.

A timeout is not an error verdict: A slow response, a busy server, or large data can all exceed the limit. The failure signal only says no result arrived; the cause still needs timing and logs.

Different from rate limiting: Rate limiting rejects too many requests per period and returns 429 quickly. A timeout means waiting a long time with no response. They need different handling.

Quick checkChoose the best answer

A form shows request timed out, but server logs show the request was processed normally and the data was written tens of seconds later. What does this show?

The server crashed halfway, so the data could not have been writtenThe request was never sent because the network was downThe client's wait limit was too short; it gave up while the server kept working

You can say this to an AI Agent

The save API sometimes takes over 10 seconds, the page reports a timeout, but the data is actually written. Find which step is slow, set a reasonable wait limit and retry rule for this request, and prevent duplicate submissions while it is still processing.

Learn next

1Rate Limit→2Server Logs→3TTFT / TPS→

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