505 is a slang term that refers to an error message or status code that signifies “HTTP Version Not Supported.”
When a website or server encounters a 505 error, it means that the HTTP protocol version used by the client (usually a web browser) is not supported by the server. In simpler terms, it indicates a compatibility issue between the client and the server’s communication protocols.
Example 1: When trying to access an outdated website with an older version of a web browser, you may encounter a 505 error, indicating that the website does not support the HTTP version used by your browser.
Example 2: If you are using a cutting-edge web browser that supports a new HTTP version, but the server you are trying to connect with only supports older versions, you may receive a 505 error, preventing the successful communication between the client and server.
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