Obtains the HTTP version enumerator value by identifier string.
Obtains the HTTP version enumerator value by identifier string. Does not throw an exception.
Obtains the HTTP identifier string by version enumerator value. ver must be a HttpVersion value different from HttpVersion.Undefined.
Checks whether id has a valid syntax for a HTTP version identifier string:
HTTP version identifier string constants
HTTP version identifier string constants and enumerator value association