400 Bad Request Error

400 is the “Bad Request” error message delivered to your browser by a web server when the request could not be understood by the server. This is most commonly caused by a problem within the web script you are using.…
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401 Unauthorized Error

401 is the “Unauthorized” error message delivered to your browser by a web server when you do not have the required privileges to access a file. This is most commonly caused by an invalid username and/or password.…
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403 Forbidden Error

403 is the “Forbidden” error message delivered to your browser by a web server when you reach a page that you do not have permission to access.…
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404 Page Not Found Error

404 is the “Page Not Found” error message delivered to your browser by a web server when the file you are attempting to reach does not exist. This if often caused by a misspelling or typo of the URL, or because the original file has been renamed or removed from …
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500 Internal Server Error

500 is the “Internal Server” error message delivered to your browser by a web server when the server encountered an unexpected problem preventing it from serving the URL you requested. This is often caused by a script that contains errors within the code.…
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501 Method Not Implemented Error

501 is the “Method Not Implemented” error message delivered to your browser by a web server when the server does not support the resource being requested.…
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503 Service Unavailable Error

503 is the “Service Unavailable” error message delivered to your browser by a web server when the server takes too long to respond and the request times out. Among other possible reasons, this is often caused by the server being temporarily overloaded.…
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