The 499 error code means Client Closed Request. It is not in the official HTTP list. One popular type of web server software created it to record a simple event: the browser or app gave up and closed the connection while the server was still working on the reply.
Because the visitor has already left, there is nobody to show a page to. That is why most people never see a 499 on screen. It lives in server logs and in monitoring dashboards, where site owners see it next to the standard codes. If you do notice a 499 in an app or a tool, it describes your side ending the call early, often because of a slow reply, a bad connection or a timeout set too short.
Common causes
1Visitor closed the tab or pressed stop
How to tellMatches page loads that took long and then vanished
What fixes itSpeed up the slow page; nothing wrong on the visitor's side
2Slow page or API reply
How to tell499s cluster on one heavy address or report
What fixes itOwner optimises the query, adds caching or moves work to the background
3Client timeout shorter than the server's work
How to tellAn app or script gives up after a few seconds every time
What fixes itRaise the client timeout or make the server answer sooner
4Unstable mobile or Wi-Fi connection
How to tellErrors spike for users on weak signal
What fixes itMove to a steadier network; owner can trim page size
5Load balancer or proxy gave up first
How to tellA proxy timeout is lower than the app's processing time
What fixes itOwner aligns timeouts across proxy, app and client
6Impatient double taps or refreshes
How to tellMany 499s paired with repeat requests for the same address
What fixes itShow a loading state so people wait instead of resending
How to fix it, step by step
Wait for the page to finish loading
Heavy pages on a slow connection can take longer than you expect. Give it a full half minute before you stop the load or press refresh. A cancelled request is exactly what produces a 499 in the server's records.
Move to a steadier network
Hop onto a different connection, such as your phone data plan in place of home Wi-Fi, or sit closer to the router. A dropped connection ends a request just like a closed tab does.
Reload once and leave it alone
Tap reload or press F5 a single time and let the page load. Repeated pressing cancels the previous try each time.
Check your app or script timeout
If you build or use a tool that calls a web address, see how long it waits for an answer. A very short limit will give up before slow replies arrive. Increase it, within reason, and test again.
Test the same page on another device
If it loads fine elsewhere, the cause is local: poor signal, an extension that cancels requests or a browser that is low on memory. Restart the browser and test again.
Owners: find the slow addresses
Filter the access log for status 499 and group by address. The pages at the top are the ones that make visitors give up, and they are the ones to speed up first.
Owners: line up the timeouts
The proxy, the application and the client each have a time limit. If the proxy limit is shorter than the app's work, users hang up and the log fills with 499s. Set them so the app finishes before any layer gives up.
What the 499 error code means in logs
Look at an access log line and you may see 499 where you would expect 200 or 404. The server never completed the reply. It could not, because the other end had disconnected. Only the server records the code; it never travels back to the visitor. So a 499 is a fact about the visitor's side leaving, not an order from the server.
A shop owner opens the access log and finds hundreds of lines for the checkout address ending in 499. Customers were tapping back after eight seconds of waiting. The fix was making the page faster, not changing anything about the customers.
Is a high number of 499s a problem?
A few are normal, since people close tabs all the time. A steady rise or a pile on one address suggests visitors are leaving because pages are slow. On an API, a high count can mean client programs time out before replies arrive, which may break features for users. Treat a sudden jump after a release as a sign to look for a new slow step.
A 499 itself does not hurt search ranking, because search crawlers do not see it. The slow pages that cause it can.
499 compared with 408, 504 and 500
| Code | Who ended the wait |
|---|---|
| 408 | The server, because the client was too slow to send its request |
| 499 | The client, which hung up first |
| 500 | Nobody waited: the server failed internally |
| 504 | A gateway, because the server behind it was too slow |
See the guides to 408 Request Timeout, 504 Gateway Timeout and 500 Internal Server Error. Every code is collected in the HTTP status codes hub.
Keeping 499 errors low
- Make slow pages faster with caching, smaller images and lighter queries.
- Show progress so visitors know something is loading.
- Run long jobs in the background and reply fast with a status address.
- Watch the trend in your monitoring so a jump gets noticed within a day.
Frequently asked questions
What is the 499 error code?
It is a non-standard code that some servers log when the client closes the connection before the server finishes replying.
What does the HTTP 499 error code mean for a visitor?
Usually nothing, since you will not see it. If a tool shows it, your side ended the request, often through a short timeout or a weak connection.
Can I fix a 499 on my website?
Yes, by making slow pages faster and aligning timeouts between proxy, app and client. Reducing wait time makes visitors stay.
Is error code 499 serious?
Not on its own. It matters when it appears in large numbers on an important page, because that shows people giving up.
Is 499 an official HTTP status code?
No. It is not in the standard registry. It is a convention from one web server and some tools that copy it.