Exception raised for an invalid protocol in the URL for a HTTP request.

EIdUnknownProtocol = class(EIdException)

EIdUnknownProtocol is an EIdException decendant that represents an exception raised when an unknown error occurs during preparation of an HTTP request. EIdUnknownProtocol is normally raised when TIdHTTP is used to prepare a request having a protocol specifier other than 'http:' or 'https:' in the URL for the request.