507
Server Error
507 Insufficient Storage: When the Server Runs Out of Space
✦ The Golden Answer: The 507 Insufficient Storage status code is a WebDAV-specific error that indicates the server is unable to store the representation needed to complete the request. This typically happens when the server's disk space is full, or when a user's storage quota has been exceeded. To resolve it, you need to free up disk space by deleting unnecessary files, clearing logs, or expanding the storage volume. If you're using a quota system, increase the user's quota or ask the user to remove old files.
Common Causes of 507 Errors
| Cause | Example | How to Fix |
|---|---|---|
| Disk space full | Server's hard drive has 0% free space. | Delete old logs, temporary files, or unused backups. Expand the disk volume. |
| User quota exceeded | A WebDAV user tries to upload a file but has reached their storage limit. | Increase the user's quota or ask them to delete old files. |
| Inode exhaustion | Too many small files consume all available inodes even if disk space is available. | Delete unnecessary small files or increase the number of inodes. |
| Temporary directory full | Server's temp directory has no space for uploads. | Clear the temp directory or move it to a larger partition. |
| File system read-only | File system is mounted read-only due to errors. | Check file system integrity and remount as read-write if safe. |
Example: 507 Response
HTTP/1.1 507 Insufficient Storage
Content-Type: text/html
<html>
<body>
<h1>507 Insufficient Storage</h1>
<p>The server is unable to store the representation. Disk space is full.</p>
</body>
</html>
How to Fix 507 Errors
- Free up disk space: Remove old logs (
/var/log/*), delete temporary files, clear cache directories, and remove unused backups. Usedf -hto check disk usage. - Increase disk capacity: If possible, expand the disk volume or add additional storage.
- Check quotas: If you're using WebDAV with quotas, increase the quota for the affected user or group.
- Clear temp directories: Many servers use
/tmpor/var/tmpfor uploads. Clear these directories periodically. - Monitor disk space: Set up alerts to notify you when disk usage exceeds a threshold (e.g., 80%).
Preventing 507 Errors
- Regular maintenance: Schedule cron jobs to clean old logs, temporary files, and cache.
- Implement quotas: Enforce user quotas to prevent any single user from filling up the disk.
- Use cloud storage: Offload static files to external storage (e.g., S3) to reduce disk usage.
- Monitor and alert: Use monitoring tools like Nagios, Zabbix, or cloud‑native monitoring to track disk usage in real time.
Frequently Asked Questions
Is 507 a client error or a server error?
It's a server error (5xx) because the server is unable to store the data. The client's request is valid, but the server lacks the resources to complete it.
Can 507 be returned outside of WebDAV?
While 507 is defined in the WebDAV specification (RFC 4918), it can be used in any context where the server runs out of storage. However, it's rarely used outside WebDAV.
What is the difference between 507 and 413?
413 Payload Too Large means the request body exceeds a configured limit (e.g., 10 MB). 507 Insufficient Storage means the server has no space to store the resource at all, regardless of the request size.