@staticmethod<EOL><INDENT>def _normalize_method_name(method):<DEDENT>
if not method or not isinstance(method, string_types):<EOL><INDENT>return method<EOL><DEDENT>method = method.lower()<EOL>if method == '<STR_LIT>':<EOL><INDENT>return SwaggerEditor._X_ANY_METHOD<EOL><DEDENT>else:<EOL><INDENT>return method<EOL><DEDENT>
Returns a lower case, normalized version of HTTP Method. It also know how to handle API Gateway specific methods
like "ANY"

NOTE: Always normalize before using the `method` value passed in as input

:param string method: Name of the HTTP Method
:return string: Normalized method name