HTTP_100='Continue', HTTP_101='Switching Protocols', HTTP_103='Early Hints', HTTP_200='OK', HTTP_201='Created', HTTP_202='Accepted', HTTP_203='Non-Authorative Information', HTTP_204='No Content', HTTP_205='Reset Content', HTTP_206='Partial Content', HTTP_300='Multiple Choices', HTTP_301='Moved Permanently', HTTP_302='Found', HTTP_303='See Other', HTTP_304='Not Modified', HTTP_305='Use Proxy', HTTP_307='Temporary Redirect', HTTP_308='Permanent Redirect', HTTP_400='Bad Request', HTTP_401='Unauthorized', HTTP_402='Payment Required', HTTP_403='Forbidden', HTTP_404='Not Found', HTTP_405='Method Not Allowed', HTTP_406='Not Acceptable', HTTP_407='Proxy Authentication Required', HTTP_408='Request Timeout', HTTP_409='Conflict', HTTP_410='Gone', HTTP_411='Length Required', HTTP_412='Precondition Failed', HTTP_413='Request Entity Too Large', HTTP_414='Request-URI Too Long', HTTP_415='Unsupported Media Type', HTTP_416='Requested Range Not Satisfiable', HTTP_417='Expectation Failed', HTTP_421='Misdirected Request', HTTP_422='Unprocessable Entity', HTTP_423='Locked', HTTP_429='Too Many Requests', HTTP_451='Unavailable For Legal Reasons', HTTP_500='Internal Server Error', HTTP_501='Not Implemented', HTTP_502='Bad Gateway', HTTP_503='Service Unavailable', HTTP_504='Gateway Timeout', HTTP_505='HTTP Version Not Supported', HTTP_507='Insufficient Storage', HTTP_511='Network Authentication Required';