First: A little cheat sheet to help you narrow down what the issue is as follows:

1xx codes: Informational statuses.

2xx codes: Statuses after a successful action.

3xx codes: Statuses showing a redirection.

4xx codes: Statuses showing a client-side error.

5xx codes: Statuses showing a client or server-side error – Send In Technical Support Ticket

 

The most common HTTP error codes and status codes

 

1 -“401 Unauthorized”

First on our list of HTTP error codes is 401. A 401 message means the server received an unauthenticated request.

In this error, a message announces that the page couldn’t load because of invalid credentials for whatever reason.

How to fix it?
It could be possible the login URL has changed, or the URL you entered is incorrect. However, if that’s not the case, try clearing the browser cache and cookies.

2 – “404 Not Found”

A 404 status code is a common HTTP error code on the internet. This HTTP response is generated when a page the user is looking for cannot be found on the server and the URL you have entered is incorrect, no longer live, or has been moved to a new location. (since it’s a client-side error).

How to fix it?
Double-check the link is typed out correctly. If so, please send in a trouble ticket with a video and screenshots of the error.

3 – “500 Internal Server Error”

A 500 Internal Server Error is a generic error that displays when something is wrong with your server. Because it’s a generic error message, there are a number of different causes including issues with WordPress plugins, PHP issues, database problems, and more.

How to fix it?
Fixing the 500 Internal Server Error is a bit onerous as more than one reason is to blame for its occurrence.

How to fix it?
Please send in a trouble ticket with a video and screenshots of the error.

4 – “502 Bad Gateway”

Unlike other HTTP error codes, 502 is different. A bad gateway occurs when one server on the internet receives an invalid response from another server. A 502 HTTP status code will be tacked on a screen when the server takes longer than expected to complete a request.

How to fix it?
Most of the time this can be fixed by simply refreshing the browser, or clearing the browser cache. If you have just migrated to the site, try waiting for 72 hours.

5 – “301 Moved Permanently”

An HTTP 301 is when a specific webpage is permanently moved to a different URL. This is not an error.

How to fix it?
Clear Browser Cache and Cookies

6 – “302 Found”

This HTTP status code is similar to the 301, but it is used for a temporary redirect. This response tells Google that the page is moved temporarily and will be back to the original URL at some point.

How to fix it?
Most of the time this can be fixed by simply refreshing the browser, or clearing the browser cache. If you have just migrated to the site, try waiting for 72 hours.

Conclusion

Now that you learned about the most common HTTP error codes and status codes, it’s time to fix them on your site and improve your site’s user experience and SEO.