HTTP 507 Insufficient Storage – Free, Online, Private

What HTTP 507 means

507 comes from WebDAV. The server cannot store the representation needed to complete the method. The disk is full, a quota is exhausted, or a parent collection cannot take the member. The request may have been valid. Retrying immediately will not create free space. The client should surface the failure, and the operator should free storage or raise the quota.

507 Insufficient Storage belongs to the 5xx server error class. Clients that only look at the class will group it with its neighbors. Clients that care about the exact code should use the narrower rule on this page, because the class is only the first digit.

When you see HTTP 507

When you see HTTP 507 Insufficient Storage, stop on that exact status line. 507 Insufficient Storage means the server cannot store what it needs to complete the request. The trace that usually produces it: The volume that holds uploads filled. The 5xx server error class only tells you the first digit. A neighbor in that class is a different fault, and the fix on this page does not transfer to it.

Return 507 when the method failed because you cannot store the result. Use 413 if the request is larger than a limit you enforce before trying. Use 429 if the limit is a request rate rather than storage. Do not return 507 for a logical validation error. The user cannot free your disk by editing a form field.

How to fix HTTP 507

To fix HTTP 507, change the condition that made the server choose Insufficient Storage. Stop retrying the upload. If the body says the account quota was hit, the user has to free space or raise the quota. If it is a server failure, the user cannot fix it. Not until storage is available. An immediate retry of a large body can make the shortage worse. If the log line is a different code, leave this page. The mix-up people make with 507 is this one: 413 means you refused the size as a policy. 507 means you tried, or you know you cannot store the result. 503 means you are unavailable for a broader reason.

• A user quota was exhausted mid-write.
• A client retried a large PUT and filled the disk faster.
• The server returned 500 for a full disk and operators did not see a storage signal.

An access log that only stores 507 is not enough to tell these apart. Keep the method, the path, and a request id. Do not keep the Authorization header or a request body that might be a token. The status explains the outcome. It is not a place to echo secrets back to the client either.

Example response

HTTP 507 Insufficient StorageHTTP/1.1 507 Insufficient Storage
Content-Type: application/json

{"error":"quota exceeded"}

Say whether the limit is the account quota or the server's disk, if that distinction is safe to reveal. A quota the user can raise is actionable. A full disk is your pager. Do not include filesystem paths that reveal the host layout.

What the client should do

Stop retrying the upload. If the body says the account quota was hit, the user has to free space or raise the quota. If it is a server failure, the user cannot fix it.

Do not cache 507 as the state of a resource that may exist once storage is available.

Not until storage is available. An immediate retry of a large body can make the shortage worse.

Codes people confuse with HTTP 507

413 means you refused the size as a policy. 507 means you tried, or you know you cannot store the result. 503 means you are unavailable for a broader reason.