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Dealing with 504 Gateway Timeout Errors - HTTP Error Code 504

Vishalini Paliwal
~ 6 min read | Published on Mar 28, 2024


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What is a 504 Error?

When browsing the web, encountering a 504 Gateway Timeout error can be frustrating. This error occurs when a server acting as a gateway or proxy does not receive a timely response from an upstream server it needs to access to fulfill the request. Essentially, the server couldn't get a response from the other server in time.

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What Are the Possible Causes for 504 Error?

Understanding the root causes of a 504 error is crucial for effective troubleshooting. Several factors could lead to this issue, including:

  1. Slow Server Response: If the server handling the request is overloaded or experiencing high traffic, it may fail to respond within the expected time frame.
  2. Timeout Settings: Configuration issues related to timeout settings on the server or intermediary proxies can result in 504 errors if requests take longer to process than the defined timeout period.
  3. Network Problems: Network congestion, DNS issues, or connectivity problems between the client and server can cause delays in request processing, leading to timeout errors.
  4. Faulty Third-party Services: Dependencies on external services, such as APIs or databases, that experience downtime or performance issues can also trigger 504 errors.

How to Handle 504 in JavaScript

When developing web applications, handling 504 errors gracefully is essential to ensure a smooth user experience. Here's how you can deal with 504 errors in JavaScript:

  .then(response => {
    if (!response.ok) {
      throw new Error('Network response was not ok');
    return response.json();
  .then(data => {
    // Handle successful response
  .catch(error => {
    console.error('Error fetching data:', error);
    // Handle 504 error appropriately

In this example, we use the Fetch API to make a request to an API endpoint. If the response status indicates an error, we catch it and handle it accordingly.

Best Practices for Using 504 Status Code

When implementing the 504 status code, adhere to these best practices:

  1. Set Realistic Timeout Values: Configure timeout settings based on your application's expected response times and the nature of the requests being made.
  2. Implement Retry Mechanisms: Consider implementing retry logic for failed requests to give the server another chance to respond before timing out.
  3. Monitor Server Health: Regularly monitor server performance and address any issues that could lead to timeouts promptly.
  4. Provide User Feedback: Inform users about the timeout error gracefully, providing guidance or alternative actions they can take.

How to Test 504 Status Code on Postman

In Postman, you can simulate a 504 error by setting up a mock server with a delay exceeding the request timeout. Here's how:

  1. Create a new mock server in Postman.
  2. Configure the mock server to respond with a delay longer than the timeout threshold.
  3. Send a request to the mock server endpoint, and observe the response with the 504 status code.

How to Test 504 Status Code in DevTools Browser in Chrome

Using Chrome DevTools, you can simulate a 504 error by throttling the network to induce delays. Follow these steps:

  1. Open Chrome DevTools by pressing F12 or right-clicking on the page and selecting "Inspect."
  2. Go to the "Network" tab.
  3. Choose a network profile (e.g., Slow 3G) from the dropdown menu.
  4. Reload the page or trigger the request you want to test.
  5. Check the network request in DevTools, and you should see the 504 status code if the request times out.

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Frequently Asked Questions

Q: How do I troubleshoot a 504 error?

A: Start by checking server logs for any indications of underlying issues. Verify network connectivity and investigate potential bottlenecks in request processing.

Q: Can a 504 error be caused by client-side issues?

A: While 504 errors typically originate from server-side problems, client-side issues like network connectivity or browser misconfigurations can indirectly contribute to such errors.

Q: Is it advisable to retry failed requests upon encountering a 504 error?

A: Implementing retry mechanisms with exponential backoff can help mitigate transient 504 errors caused by temporary server overloads or network issues.

Q: How can CDNs (Content Delivery Networks) impact 504 errors?

A: CDNs can sometimes introduce additional points of failure, leading to 504 errors if they experience issues communicating with origin servers or serving cached content.

Q: Are there any tools available for monitoring and handling 504 errors?

A: Yes, tools like Zipy offer comprehensive error monitoring solutions with session replay capabilities, allowing you to identify and address 504 errors effectively.


Dealing with 504 Gateway Timeout errors requires a systematic approach and understanding of the underlying causes. By implementing best practices, testing methodologies, and leveraging tools like Zipy for error monitoring, developers can ensure robust and reliable web applications. Take advantage of Zipy's capabilities for monitoring and handling errors effectively. Zipy provides invaluable insights and solutions to enhance your web development workflow.

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