A Quick Guide on How to Fix HTTP Error 505 Version Not Supported

Sanjana Kumari

HTTP Error 505, also known as “Version not Supported,” is an error code that occurs when a web server receives a request from a client using an unsupported HTTP protocol version. This error indicates that the web server does not support the version of HTTP specified in the client’s request. In this article, we will discuss the causes of HTTP Error 505 and provide a short guide on how to fix it.Are you experiencing an HTTP Error 505 “Version Not Supported” while browsing the internet? This error can be frustrating, but worry not! In this guide, we’ll walk you through the steps to fix this error and provide some useful tips to prevent it from occurring in the future.


When browsing the web, you may occasionally encounter various HTTP error codes. One such error is the HTTP Error 505, which occurs when the version of HTTP protocol used by your browser is not supported by the website you’re trying to access. In the following sections, we’ll delve into the details of this error, its common causes, and most importantly, how to fix it.

What is HTTP Error 505?


HTTP Error 505, also known as “HTTP Version Not Supported,” is a server-side error that indicates the web server doesn’t support the HTTP protocol version used by the client (your browser). This error occurs when a website’s server encounters a request with an unsupported HTTP version and fails to respond properly.

Common Causes

There are several reasons why you might encounter an HTTP Error 505. Some of the common causes include:

  • Outdated browser version
  • Incompatibility between the browser and the website’s server
  • Server-side misconfiguration
  • Website using an outdated or unsupported HTTP protocol version

Understanding the causes can help you narrow down the troubleshooting steps needed to resolve the issue.

How to Identify HTTP Error 505?

When you encounter an HTTP Error 505, your browser will display an error message indicating the issue. Additionally, there are other ways to identify this error.

Error Message

The error message for HTTP Error 505 typically states “HTTP Version Not Supported” or something similar. It may also provide additional details about the server and the supported HTTP versions.

Browser Response

Besides the error message, you might notice that the website fails to load correctly or that certain elements are missing. The browser may display a blank page or show an error page instead.

Steps to Fix HTTP Error 505

Now that you understand what HTTP Error 505 is and how to identify it, let’s explore the steps to fix it.

Check Browser Version

Start by ensuring that you’re using the latest version of your browser. Outdated browsers can often cause compatibility issues with websites. Check the browser’s official website for updates or enable automatic updates for a hassle-free experience.

Clear Browser Cache

A cluttered cache can sometimes interfere with the proper functioning of websites. Clearing your browser cache can help resolve HTTP Error 505 and other similar issues. Access your browser’s settings and locate the option to clear cache or browsing data. Follow the instructions to complete the process.

Disable Proxy Settings

If you are using a proxy server, try disabling it temporarily to see if it resolves the HTTP Error 505. Proxy servers can sometimes interfere with the communication between the client and the web server, causing compatibility issues. By disabling the proxy settings, you can establish a direct connection with the web server and bypass any potential obstacles.

Update or Switch Browsers

If clearing the cache doesn’t fix the issue, consider updating your browser to the latest version available. Updating your browser can ensure compatibility with the websites you visit. Alternatively, you can try switching to a different browser altogether to see if the error persists.

Update Server Software

If the error persists even after updating your browser, it’s possible that the website’s server is using an outdated or unsupported version of the HTTP protocol. In this case, the responsibility lies with the website’s administrator to update the server software to a compatible version. Unfortunately, as a user, you have limited control over this aspect. However, you can try reaching out to the website’s support team to notify them of the issue.

If you encounter HTTP Error 505 on a specific website consistently, it is possible that the web server hosting that site is not updated to support the HTTP protocol version used by your browser. In such cases, there is not much you can do on your end except contacting the website administrator and notifying them about the issue. It is their responsibility to ensure that the web server software is up to date and compatible with the latest HTTP standards.

Contact Website Support

If none of the previous steps resolve the HTTP Error 505, it’s advisable to contact the support team of the website you’re trying to access. Provide them with details about the error you’re experiencing, including the specific error message and any other relevant information. The website’s support team should be able to assist you further in resolving the issue or provide alternative solutions.

If you continue to experience HTTP Error 505 on a particular website and none of the previous steps have resolved the issue, it is advisable to reach out to the website administrator. They have the technical knowledge and access to the server settings, allowing them to investigate the problem further. Informing the website administrator about the error can help them identify and fix any compatibility issues on their end.

Tips to Prevent HTTP Error 505

Prevention is always better than finding a fix. Here are some tips to help you prevent encountering HTTP Error 505 in the future:

  1. Keep your browser up to date: Regularly update your browser to ensure compatibility with the latest HTTP protocol versions.
  2. Enable automatic updates: Enable automatic updates for your browser to stay on top of the latest security patches and bug fixes.
  3. Clear cache regularly: Clear your browser’s cache periodically to prevent any conflicts with cached data.
  4. Use a reputable browser: Stick to well-established browsers with good compatibility records to minimize the chances of encountering HTTP errors.
  5. Stay informed: Keep yourself informed about the latest web technologies and protocols to understand any potential compatibility issues.


Encountering an HTTP Error 505 “Version Not Supported” can be frustrating, but with the right knowledge, you can troubleshoot and resolve the issue effectively. In this guide, we discussed the definition and common causes of HTTP Error 505, as well as provided step-by-step solutions to fix the error. Remember to keep your browser updated, clear your cache regularly, and reach out to website support if needed. By following these tips, you can prevent HTTP Error 505 and enjoy a smooth browsing experience.


Q1: What does HTTP Error 505 “Version Not Supported” mean?

HTTP Error 505 indicates that the web server does not support the HTTP protocol version used by your browser.

Q2: How can I identify HTTP Error 505?

You can identify HTTP Error 505 by the error message displayed on your browser and the website’s failure to load properly.

Q3: What should I do if I encounter HTTP Error 505?

Try updating your browser, clearing your cache, or switching to a different browser. If the error persists, contact the website’s support team for assistance.

Q4: Can an outdated browser cause HTTP Error 505?

Yes, using an outdated browser version can lead to compatibility issues, including HTTP Error 505.

Q5: How can I prevent HTTP Error 505 in the future?

Keep your browser updated, clear cache regularly, and use reputable browsers to minimize the chances of encountering HTTP Error 505.

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