HTTP Status Code Errors

IMPORTANT TOPIC FOR SEO PROFESSIONALS: HTTP Status Code Errors: 

HTTP status codes (the 4xx and 5xx varieties) appear when there is some kind of error loading a web page. HTTP status codes are standard types of errors so you could see them in any browser, like Internet Explorer, Firefox, Chrome, etc.

 400 (Bad Request)

The 400 Bad Request HTTP status code means that the request you sent to the website server (for example, a request to load a web page) was somehow malformed.

401 (Unauthorized)

The 401 Unauthorized HTTP status code means that the page you were trying to access can not be loaded until you first log on with a valid username and password.

403 (Forbidden)
The 403 Forbidden HTTP status code means that accessing the page or resource you were trying to reach is absolutely forbidden.

404 (Not Found)
The 404 Not Found HTTP status code means that the page you were trying to reach could not be found on the web site's server. This is the most popular HTTP status code that you will probably see.

408 (Request Timeout)
The 408 Request Timeout HTTP status code indicates that the request you sent to the website server (like a request to load a web page) timed out.

500 (Internal Server Error)
500 Internal Server Error is a very general HTTP status code meaning something went wrong on the web site's server but the server could not be more specific on what the exact problem was.

502 (Bad Gateway)
The 502 Bad Gateway HTTP status code means that one server received an invalid response from another server that it was accessing while attempting to load the web page or fill another request by the browser.

503 (Service Unavailable)
The 503 Service Unavailable HTTP status code means the web site's server is simply not available at the moment.

504 (Gateway Timeout)
The 504 Gateway Timeout HTTP status code means that one server did not receive a timely response from another server that it was accessing while attempting to load the web page or fill another request by the browser.

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