HTTP 499 Client Closed Request (Nginx)

Overview

The HTTP 499 Client Closed Request status code is specific to Nginx and indicates that the client closed the connection before the server could respond. This status is often seen when a client terminates the request prematurely.

Purpose

The HTTP 499 response is used to inform that the client closed the connection, and the server did not have the opportunity to send a complete response.

Usage

Client Behavior:

1. Send Request: The client sends an HTTP request to the server.
2. Close Connection: The client closes the connection before receiving a complete response.

Server Behavior:

1. Processing Request: The server processes the request.
2. Connection Closed: The client closes the connection before the server completes the response.
3. Send Response: The server sends a 499 Client Closed Request response to indicate the premature connection closure.

Scenarios

• User Interruption: The user navigates away or interrupts the request before completion.
• Network Issues: Connection issues result in the client closing the request prematurely.

Sequence Diagram

Illustrating the process for an HTTP 499 response:

sequenceDiagram
    participant Client
    participant Server as Nginx

    Note over Client: Client initiates a request
    Client->>Server: GET /resource HTTP/1.1
    Note over Server: Server processes the request
    Server-->>Client: 499 Client Closed Request

Curl Request and Response Example

Sending a request with Curl and closing the connection:

curl -i http://example.com/resource
# Expected response: HTTP/1.1 499 Client Closed Request

PHP cURL Request and Response Example

PHP script using cURL to simulate a client closing the connection:

<?php
$ch = curl_init('http://example.com/resource');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_exec($ch);
// Simulate client closing the connection
curl_close($ch);
?>

Python Request and Response Example

Python script to send a request and simulate a client closing the connection:

import requests
response = requests.get('http://example.com/resource')
# Simulate client closing the connection
response.connection.close()

Apache Configuration for HTTP 499 Client Closed Request (Nginx)

Nginx typically handles the 499 status code automatically without additional configuration.

NGINX Configuration for HTTP 499 Client Closed Request

No specific configuration is required for NGINX to handle the 499 status code, as it is automatically generated when the client closes the request prematurely.

HTTP 451 Unavailable For Legal Reasons HTTP 500 Internal Server Error