/// If CEF_SCHEME_OPTION_STANDARD is set the scheme will be treated as a
/// standard scheme. Standard schemes are subject to URL canonicalization and
/// parsing rules as defined in the Common Internet Scheme Syntax RFC 1738
/// Section 3.1 available at http://www.ietf.org/rfc/rfc1738.txt
///
/// In particular, the syntax for standard scheme URLs must be of the form:
///
/// [scheme]://[username]:[password]@[host]:[port]/[url-path]
///
Standard scheme URLs must have a host component that is a fully
/// qualified domain name as defined in Section 3.5 of RFC 1034 [13] and
/// Section 2.1 of RFC 1123. These URLs will be canonicalized to
/// "scheme://host/path" in the simplest case and
/// "scheme://username:password@host:port/path" in the most explicit case. For
/// example, "scheme:host/path" and "scheme:///host/path" will both be
/// canonicalized to "scheme://host/path". The origin of a standard scheme URL
/// is the combination of scheme, host and port (i.e., "scheme://host:port" in
/// the most explicit case).
///
/// For non-standard scheme URLs only the "scheme:" component is parsed and
/// canonicalized. The remainder of the URL will be passed to the handler as-
/// is. For example, "scheme:///some%20text" will remain the same.
/// Non-standard scheme URLs cannot be used as a target for form submission.
///
///