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Dealing with 423 Locked Resource Errors - HTTP Error Code 423

Karthik MSN
~ 8 min read | Published on Mar 28, 2024


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What is a 423 Error?

HTTP status codes are vital communication tools between a web server and a client, providing insight into the success or failure of a request. Among these, the 423 Locked error stands out, indicating that the requested resource is locked and cannot be accessed. Understanding its implications is crucial for web developers and IT professionals alike.

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What Are the Possible Causes for 423 Error?

Several scenarios can trigger a 423 Locked error:

1. Concurrent Access:

When multiple users attempt to access the same resource simultaneously, certain systems lock it to prevent conflicts. If a user tries to access a locked resource, the server responds with a 423 error.

2. Distributed Systems:

In distributed systems, where resources are shared across multiple servers or nodes, synchronization issues may arise. If one node locks a resource while another node tries to access it, a 423 error occurs.

3. Misconfigured Servers:

Improper server configurations, such as incorrect permissions or access control settings, can lead to unexpected resource locking and subsequent 423 errors.

How to Handle 423 in JavaScript

Dealing with a 423 error in JavaScript requires careful handling to ensure smooth user experience. Here's a basic example of how to handle it gracefully:

  .then(response => {
    if (response.status === 423) {
      // Handle the 423 error here
      console.error('Resource is locked. Please try again later.');
    } else {
      // Handle other responses
      return response.json();
  .then(data => {
    // Process data if request was successful
  .catch(error => {
    // Handle network errors or other issues
    console.error('Error:', error);

Best Practices for Using 423 Status Code

To make effective use of the 423 status code, consider the following best practices:

1. Provide Informative Error Messages:

When returning a 423 status code, include informative error messages to guide users on why the resource is locked and how they can proceed.

2. Implement Retry Mechanisms:

Encourage users to retry accessing the resource after a certain interval, rather than immediately giving up. Implement exponential backoff strategies to avoid overwhelming the server with retry attempts.

3. Utilize ETags for Concurrency Control:

Employ Entity Tags (ETags) to manage concurrency and avoid conflicting updates to the same resource. Compare ETags when attempting to modify a resource to prevent unintended modifications.

How to Test 423 Status Code on Postman

Testing the 423 status code on Postman is straightforward:

1. Set Up a Request:

Create a new request in Postman and specify the URL of the resource that you want to test.

2. Send the Request:

Send the request to the server. If the resource is locked and the server responds with a 423 status code, you'll see it in the response details.

3. Analyze the Response:

Inspect the response headers and body to verify that the server correctly returns the 423 status code and any accompanying error messages.

How to Test 423 Status Code in DevTools Browser in Chrome

Testing the 423 status code using Chrome DevTools is a useful way to debug and troubleshoot:

1. Open DevTools:

Launch Google Chrome and navigate to the page where the locked resource is located. Right-click anywhere on the page and select "Inspect" to open DevTools.

2. Network Tab:

Switch to the "Network" tab in DevTools. Perform the action that triggers the request to the locked resource.

3. Inspect Response:

Look for the request corresponding to the locked resource in the network activity list. Click on it to view detailed information, including the response headers and status code (hopefully, a 423).

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Frequently Asked Questions

Q: How can I prevent 423 errors in my web application?

A: Implement proper resource locking mechanisms, employ optimistic concurrency control strategies, and ensure robust error handling to minimize the occurrence of 423 errors.

Q: Can a client override a 423 status code?

A: In most cases, clients cannot override a 423 status code. However, certain circumstances may allow clients with sufficient permissions to unlock a resource through authentication and authorization mechanisms.

Q: Is there a difference between a 423 error and a 401 error?

A: Yes, a 423 error indicates that the resource is locked, while a 401 error signifies unauthorized access, typically due to missing or invalid credentials.

Q: How does the 423 status code differ from other client errors like 404 or 403?

A: While a 404 error indicates that the requested resource was not found, and a 403 error signifies forbidden access, a 423 error specifically denotes that the resource is locked and temporarily unavailable.

Q: Are there any security implications associated with 423 errors?

A: Yes, improper handling of 423 errors could potentially lead to security vulnerabilities, such as unauthorized access to locked resources or denial-of-service attacks.


In summary, understanding and effectively managing 423 Locked Resource Errors is crucial for maintaining the reliability and security of web applications. By following best practices, implementing proper error handling mechanisms, and utilizing tools like Zipy's error monitoring with session replay capabilities, developers can ensure smoother user experiences and mitigate potential issues proactively. Explore Zipy's tool for comprehensive error management and optimization:

Read more resources on 4xx error status codes

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