408 Request Timeout
A 408 Request Timeout error means the server waited too long for the client to complete sending the request and closed the connection. This is different from a 504 Gateway Timeout, which involves a server-side delay. For end users, this typically means your internet connection was too slow or interrupted while the browser was sending data to the server.
Common causes
- Slow or unstable network connection causing the request to take too long to transmit
- Uploading a very large file that exceeds the server's patience for receiving data
- Client-side code is building the request body too slowly with delayed streaming
- Server has an aggressively short timeout configured for incoming requests
- Network middleware such as proxies or firewalls are throttling the connection
How to fix it
- Check your network connection stability and retry the request on a faster connection
- Break large file uploads into smaller chunks using multipart or resumable upload protocols
- Increase the server-side request timeout if the current value is too aggressive
- Implement retry logic with exponential backoff in your client to handle transient timeouts
- Review proxy and firewall timeout settings to ensure they allow enough time for the request
Detect 408 Request Timeout errors with Checkend
Checkend monitors your application and alerts you when 408 errors occur, with full request context:
- Full request details (URL, headers, params)
- Server-side stack trace and error context
- Automatic grouping of similar errors
- Instant notifications when error rates spike
Related HTTP errors
An HTTP 504 Gateway Timeout error means that a server acting as a gateway or proxy did not receive a...
An HTTP 503 Service Unavailable error indicates that the server is temporarily unable to handle the ...
A 429 Too Many Requests error means the user has sent too many requests in a given amount of time an...
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