HTTP 424 Failed Dependency (WebDAV)

Overview

The HTTP 424 Failed Dependency status code indicates that the method could not be performed on the resource because the requested action depends on another action that has failed. This response is often associated with WebDAV (Web Distributed Authoring and Versioning) scenarios.

Purpose

The HTTP 424 response is used to inform the client that the requested action could not be completed due to a failed dependency.

Usage

Client Behavior:

1. Send Request: The client sends an HTTP request that depends on another action.
2. Receive Response: The client receives the HTTP 424 status code, indicating a failed dependency.
3. Handle Dependency: The client may need to address the failed dependency before retrying the request.

Server Behavior:

1. Evaluate Dependency: The server identifies a dependency that has failed for the requested action.
2. Send Response: The server responds with a 424 Failed Dependency status.

Scenarios

• WebDAV Operations: Commonly used in WebDAV scenarios when a requested action depends on another action that has failed.

Sequence Diagram

Illustrating the process for an HTTP 424 response:

sequenceDiagram
    participant Client
    participant Server as Web Server

    Note over Client: Client sends a request with a failed dependency
    Client->>Server: POST /resource HTTP/1.1
    Note over Server: Server identifies a failed dependency
    Server->>Client: HTTP/1.1 424 Failed Dependency

Curl Request and Response Example

Sending a request with a failed dependency using Curl:

curl -i -X POST http://example.com/resource
# Expected response: HTTP/1.1 424 Failed Dependency

PHP cURL Request and Response Example

PHP script using cURL to handle a 424 Failed Dependency response:

<?php
$ch = curl_init('http://example.com/resource');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
if (curl_getinfo($ch, CURLINFO_HTTP_CODE) == 424) {
    echo "Failed Dependency. Additional details may be provided.";
}
curl_close($ch);
?>

Python Request and Response Example

Python script to handle a 424 Failed Dependency response:

import requests
response = requests.post('http://example.com/resource')
if response.status_code == 424:
    print("Failed Dependency. Additional details may be provided.")

Apache Configuration for HTTP 424 Failed Dependency

Configuring Apache to handle scenarios where a requested action depends on another action that has failed:

<VirtualHost *:80>
    ServerName example.com
    <Location "/resource">
        # Additional configuration to identify and handle dependencies
        # ...
        # Return 424 Failed Dependency on dependency failure
        ErrorDocument 424 "HTTP/1.1 424 Failed Dependency"
    </Location>
</VirtualHost>

NGINX Configuration for HTTP 424 Failed Dependency

Setting up NGINX to handle scenarios where a requested action depends on another action that has failed:

server {
    listen 80;
    server_name example.com;
    location /resource {
        # Additional configuration to identify and handle dependencies
        # ...
        # Return 424 Failed Dependency on dependency failure
        return 424 "HTTP/1.1 424 Failed Dependency";
    }
}

HTTP 423 Locked (WebDAV) HTTP 425 Reserved for WebDAV