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Handling 405 Method Not Allowed Responses - HTTP Error Code 405

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


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What is a 405 Error?

When browsing the web, encountering errors is not uncommon. One such error is the 405 Method Not Allowed response. Essentially, this error indicates that the server understands the request method (GET, POST, PUT, DELETE, etc.) but refuses to process it. This could be due to various reasons, which we'll explore further in this article.

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What Are the Possible Causes for 405 Error?

Understanding the root causes of the 405 error is crucial for effective troubleshooting. Here are some common reasons why you might encounter this error:

1. Lack of Permission

The server may restrict certain HTTP methods for specific resources. If the client tries to use an unauthorized method, such as attempting to write to a read-only resource, the server responds with a 405 error.

2. Misconfigured Server

Incorrect server configurations can lead to 405 errors. For instance, the server might not recognize the request method due to misconfigured settings.

3. Cross-Origin Resource Sharing (CORS) Issues

CORS policies enforced by the server can sometimes result in 405 errors, especially when making cross-origin requests that are not permitted by the server.

4. Framework Restrictions

Certain web frameworks or libraries impose restrictions on allowed HTTP methods by default. Trying to use disallowed methods within these frameworks can trigger a 405 error.

5. Security Measures

Security protocols implemented on the server side may block certain HTTP methods for security reasons, leading to a 405 response.

How to Handle 405 in JS

Handling 405 errors in JavaScript involves implementing appropriate error-handling mechanisms. Below is a basic example demonstrating how to handle a 405 error using JavaScript:

fetch('<>', {
  method: 'POST',
  body: JSON.stringify(data),
  headers: {
    'Content-Type': 'application/json'
.then(response => {
  if (!response.ok) {
    if (response.status === 405) {
      throw new Error('Method Not Allowed');
    throw new Error('Network response was not ok');
  return response.json();
.catch(error => {
  console.error('Error:', error);

In this example, we use the Fetch API to make a POST request to a hypothetical API endpoint. If the server responds with a 405 status code, we handle the error accordingly.

Best Practices for Using 405 Status Code

To ensure smooth operation and better user experience, consider the following best practices when dealing with 405 status codes:

  • Proper Error Handling: Implement robust error-handling mechanisms in your client-side code to gracefully handle 405 errors and provide meaningful feedback to users.
  • Check Server Documentation: Refer to the server documentation to understand which HTTP methods are allowed for specific resources. Avoid using disallowed methods to prevent 405 errors.
  • Use Standard HTTP Methods: Stick to standard HTTP methods for CRUD operations (GET, POST, PUT, DELETE) to minimize the chances of encountering 405 errors.
  • Configure CORS Policies: If your application makes cross-origin requests, ensure that CORS policies are properly configured to avoid CORS-related 405 errors.
  • Regularly Test APIs: Periodically test your APIs using tools like Postman or browser developer tools to identify and address any 405 errors promptly.

How to Test 405 Status Code on Postman

Postman provides a convenient way to test API endpoints and their responses. Follow these steps to test for a 405 status code using Postman:

  1. Open Postman and create a new request.
  2. Enter the URL of the API endpoint you want to test.
  3. Select the appropriate HTTP method (e.g., POST) from the dropdown menu.
  4. Click on the "Send" button to make the request.
  5. Check the response status in the "Status" column. If it's 405, the server doesn't allow the requested method.

How to Test 405 Status Code in DevTools Browser in Chrome

Chrome's Developer Tools offer a built-in way to inspect and debug web applications. Here's how you can test for a 405 status code using Chrome DevTools:

  1. Open Chrome and navigate to the webpage containing the resource you want to test.
  2. Open DevTools by right-clicking anywhere on the page and selecting "Inspect" or pressing Ctrl + Shift + I.
  3. Go to the "Network" tab in DevTools.
  4. Perform the action (e.g., submitting a form) that triggers the request you want to test.
  5. Look for the request in the list of network requests. The status column will indicate if the request resulted in a 405 error.

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Frequently Asked Questions

Q: What should I do if I encounter a 405 error in my application?

A: First, verify that you're using the correct HTTP method for the resource you're trying to access. If the method is correct, check the server configurations and ensure that the method is allowed for that resource. Implement appropriate error handling in your client-side code to manage 405 errors gracefully.

Q: Can I customize the response message for a 405 error?

A: Yes, you can customize the response message for a 405 error by configuring your server to handle such errors. Consult your server documentation or web framework's documentation for instructions on how to customize error responses.

Q: Is it safe to ignore 405 errors and continue using the application?

A: Ignoring 405 errors is not recommended, as they indicate potential issues with the application's functionality or server configurations. It's essential to investigate the cause of the error and address it to ensure the application operates smoothly.

Q: How can I prevent 405 errors when making AJAX requests?

A: When making AJAX requests, ensure that the requested HTTP method is allowed for the resource you're accessing. Check CORS policies if making cross-origin requests, and handle errors gracefully in your client-side code to manage 405 responses appropriately.

Q: Are there any browser extensions or tools to help diagnose 405 errors?

A: While there are browser extensions and developer tools available for diagnosing various HTTP errors, such as Chrome's Developer Tools and Firefox's Network Monitor, there isn't a specific tool dedicated solely to 405 errors. However, these tools can help inspect network requests and responses, aiding in troubleshooting 405 errors.


Handling 405 Method Not Allowed responses is essential for maintaining the reliability and functionality of web applications. By understanding the causes of 405 errors and following best practices for error handling and testing, developers can ensure smoother user experiences and better application performance.

For comprehensive error monitoring and management, consider using Zipy's tool, which offers session replay capabilities to identify and resolve errors effectively. Visit Zipy for more information on how it can streamline error handling in your projects.

Read more resources on 4xx error status codes

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