What is 424 failed dependency?

The HTTP 424 status code is a client error response that occurs when a requested operation cannot be completed because it depends on another action that has failed. This status code is primarily used in WebDAV (Web Distributed Authoring and Versioning) protocols and appears as part of a 207 Multi-Status response. 

When you encounter a 424 Failed Dependency error, it indicates that while the server received your request, it could not process it due to a failure in a dependent operation. 

What Causes the 424 Failed Dependency?

Several factors can trigger an HTTP 424 response. The most common cause is when multiple operations are bundled together, and one operation’s failure prevents others from executing successfully. 

For instance, in WebDAV operations like PROPPATCH, where multiple properties are modified simultaneously if one property update fails, the entire request might result in a 424 Failed Dependency error. 

Other causes include authentication failures, timing issues between dependent requests, server-side errors, or network connectivity problems. 

When multiple operations are interconnected, the failure of one critical operation can trigger this error for all dependent operations.

Example

Request:

PROPPATCH /user/profile HTTP/1.1

Host: example.com

Content-Type: application/xml

Content-Length: 200

<propertyupdate>

  <set>

    <prop>

      <username>johndoe</username>

      <email>john@example.com</email>

    </prop>

  </set>

</propertyupdate>

Response:

HTTP/1.1 207 Multi-Status

Content-Type: application/xml

<multistatus>

  <response>

    <href>http://example.com/user/profile</href>

    <propstat>

      <prop><username/></prop>

      <status>HTTP/1.1 424 Failed Dependency</status>

    </propstat>

    <propstat>

      <prop><email/></prop>

      <status>HTTP/1.1 403 Forbidden</status>

    </propstat>

  </response>

</multistatus>

In this example, the username update fails with a 424 Failed Dependency because it depends on the email update, which was forbidden. This demonstrates how a failure in one operation can cascade to dependent operations.

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