Answers | Personal Concept
I did these series of graphics just for fun, but some might have find some answers around ;)
404 Not Found
The most common error code you run into is a 404 error. The 404 status code means the requested resource is no longer available or, more specifically, just not found. Was it ever available there? You don’t know. You do know it isn’t available there now.
What are some of the reasons for a 404 error? Typos are a common reason for getting a 404 error. A missing or extra letter in a typed-in url, or a wrong domain name can often result in a 404 error. Another reason for 404 errors isn’t typos; it is the aging of the web. When someone writes an article or blog, that person might link to a secondary source to provide additional information for the article. Now imagine revisiting said article six months or six years later. If what was linked to is no longer on the web, a 404 error will be generated when you click on the link in the browser.
403 Forbidden
Another common client-side response status code is 403. Getting a 403 status code back from an HTTP request means access to the resource is forbidden. This is not an authentication problem; those are 401 (unauthorized) errors. One common reason for 403 errors is the server maintaining a whitelist of machines that can access that system and the user’s machine not being on it. If the client’s certificate is no longer valid (or is just plain missing), that’s another reason for a 403 error response. There typically is no recovery from these, short of trying from a different machine. Finally, there’s also the possibility of wrong permissions associated to files. Often in Linux and sometimes in Windows, a webserver will not have access to website files because of faulty permissions. This will also result in a 403 error. The server owner will need to change the file permissions to fix this.
The 404 & 403 | Error Codes
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