The most 5 Common HTTP Errors According to Google :

Sometimes when you try to visit web page, you’re met with an HTTP error message. It’s a message came from the web server that something went wrong. In some cases it could be a mistake you made, but often it’s the site’s fault.

Each type of error has an HTTP error code dedicated to it. For example, if you try to access a non-existing page on a website, you will be met by the familiar 404 error.

Top 5 Errors According to Google :

1. HTTP ERROR 401 (UNAUTHORIZED) :

This error happens when a website visitor tries to access a restricted web page but isn’t authorized to do so, usually because of a failed login attempt.

Access is denied due to invalid credentials. This behavior occurs if the following conditions are true: The Web site that you try to view uses Integrated Windows authentication. The application pool for the Web site recycles during the authentication process.

2. HTTP ERROR 400 (BAD REQUEST) :

This is basically an error message from the web server telling you that the application you are using (e.g. your web browser) accessed it incorrectly or that the request was somehow corrupted on the way.

The 400 Bad Request error is an HTTP status code that means that the request you sent to the website server, often something simple like a request to load a web page, was somehow incorrect or corrupted and the server couldn’t understand it.

3. HTTP ERROR 403 (FORBIDDEN) :

This error is similar to the 401 error, but note the difference between unauthorized and forbidden. In this case no login opportunity was available. This can for example happen if you try to access a (forbidden) directory on a website.

The 403 Forbidden error is an HTTP status code which means that accessing the page or resource you were trying to reach is absolutely forbidden for some reason. This article contains basic troubleshooting instructions for 403 Forbidden errors.

4. HTTP ERROR 404 (NOT FOUND) :

Most people are bound to recognize this one. A 404 error happens when you try to access a resource on a web server (usually a web page) that doesn’t exist. Some reasons for this happening can for example be a broken link, a mistyped URL, or that the webmaster has moved the requested page somewhere else (or deleted it). To counter the ill effect of broken links, some websites set up custom pages for them.

The HTTP 404 Not Found Error means that the webpage you were trying to reach could not be found on the server. It is a Client-side Error which means that either the page has been removed or moved and the URL was not changed accordingly, or that you typed in the URL incorrectly.

5. HTTP ERROR 500 (INTERNAL SERVER ERROR) :

The description of this error pretty much says it all. It’s a general-purpose error message for when a web server encounters some form of internal error. For example, the web server could be overloaded and therefore unable to handle requests properly.

The 500 Internal Server Error is a very general HTTP status code that means something has gone wrong on the web site’s server but the server could not be more specific on what the exact problem is. Most of the time, “gone wrong” means an issue with the page or site’s programming, nothing you have anything to do with.

Some Additional Comments on Website Errors :

We would like to point out that all the error messages above are errors reported by the web server back to the visitor (that is the nature of HTTP errors, they come from the web server you are accessing).

Needless to say, if you can’t access a website at all, for example if its network (or yours) is down, you won’t get an HTTP error back. Your connection attempt will simply time out.