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Urljoinhttpexa is a type of exception that occurs in Python when the urljoin function is called with a base URL and a relative URL that exceeds the length of the base URL. The urljoin function is used to join a base URL with a relative URL or path to create an absolute URL.

When a relative URL is longer than the base URL, the urljoin function cannot properly append the relative URL to the base URL, resulting in a ValueError being raised. This exception is raised because the urljoin function is expecting the relative URL to be shorter than the base URL, and is unable to handle cases where the relative URL is longer.

The urljoinhttpexa exception is typically raised when a relative URL is passed to the urljoin function that is not properly normalized or sanitized, resulting in a URL that is longer than the base URL. This can be caused by a variety of factors, including, but not limited to, poorly formatted URLs, incomplete URLs, and unexpected characters in the relative URL.

To prevent the urljoinhttpexa exception, it is recommended to properly normalize and sanitize relative URLs before passing them to the urljoin function. This can be accomplished by using built-in functions such as urllib.parse.urlparse to break down the relative URL into its constituent parts, and then reassemble it using the urljoin function.

By taking steps to normalize and sanitize relative URLs, developers can avoid the urljoinhttpexa exception and ensure that their applications can properly handle relative URLs of varying lengths.