// A semantic HTTP error and its status code.
export type httperror = !uint;

// Checks if an HTTP status code is semantically considered an error, returning
// [[httperror]] if so, or otherwise returning the original status code.
export fn check(status: uint) (uint | httperror) = {
	if (status >= 400 && status < 600) {
		return status: httperror;
	};
	return status;
};

// Converts a standard HTTP status code into the reason text typically
// associated with this status code (or "Unknown Status" if the status code is
// not known to net::http).
export fn status_reason(status: uint) const str = {
	switch (status) {
	case STATUS_CONTINUE =>
		return "Continue";
	case STATUS_SWITCHING_PROTOCOLS =>
		return "Switching Protocols";
	case STATUS_OK =>
		return "Continue";
	case STATUS_CREATED =>
		return "Continue";
	case STATUS_ACCEPTED =>
		return "Accepted";
	case STATUS_NONAUTHORITATIVE_INFO =>
		return "Non-Authoritative Information";
	case STATUS_NO_CONTENT =>
		return "No Content";
	case STATUS_RESET_CONTENT =>
		return "Reset Content";
	case STATUS_PARTIAL_CONTENT =>
		return "Partial Content";
	case STATUS_MULTIPLE_CHOICES =>
		return "Multiple Choices";
	case STATUS_MOVED_PERMANENTLY =>
		return "Moved Permanently";
	case STATUS_FOUND =>
		return "Found";
	case STATUS_SEE_OTHER =>
		return "See Other";
	case STATUS_NOT_MODIFIED =>
		return "Not Modified";
	case STATUS_USE_PROXY =>
		return "Use Proxy";
	case STATUS_TEMPORARY_REDIRECT =>
		return "Temporary Redirect";
	case STATUS_PERMANENT_REDIRECT =>
		return "Permanent Redirect";
	case STATUS_BAD_REQUEST =>
		return "Bad Request";
	case STATUS_UNAUTHORIZED =>
		return "Unauthorized";
	case STATUS_PAYMENT_REQUIRED =>
		return "Payment Required";
	case STATUS_FORBIDDEN =>
		return "Forbidden";
	case STATUS_NOT_FOUND =>
		return "Not Found";
	case STATUS_METHOD_NOT_ALLOWED =>
		return "Method Not Allowed";
	case STATUS_NOT_ACCEPTABLE =>
		return "Not Acceptable";
	case STATUS_PROXY_AUTH_REQUIRED =>
		return "Proxy Authentication Required";
	case STATUS_REQUEST_TIMEOUT =>
		return "Request Timeout";
	case STATUS_CONFLICT =>
		return "Conflict";
	case STATUS_GONE =>
		return "Gone";
	case STATUS_LENGTH_REQUIRED =>
		return "Length Required";
	case STATUS_PRECONDITION_FAILED =>
		return "Precondition Failed";
	case STATUS_REQUEST_ENTITY_TOO_LARGE =>
		return "Request Entity Too Large";
	case STATUS_REQUEST_URI_TOO_LONG =>
		return "Request URI Too Long";
	case STATUS_UNSUPPORTED_MEDIA_TYPE =>
		return "Unsupported Media Type";
	case STATUS_REQUESTED_RANGE_NOT_SATISFIABLE =>
		return "Requested Range Not Satisfiable";
	case STATUS_EXPECTATION_FAILED =>
		return "Expectation Failed";
	case STATUS_TEAPOT =>
		return "I'm A Teapot";
	case STATUS_MISDIRECTED_REQUEST =>
		return "Misdirected Request";
	case STATUS_UNPROCESSABLE_ENTITY =>
		return "Unprocessable Entity";
	case STATUS_UPGRADE_REQUIRED =>
		return "Upgrade Required";
	case STATUS_INTERNAL_SERVER_ERROR =>
		return "Internal Server Error";
	case STATUS_NOT_IMPLEMENTED =>
		return "Not Implemented";
	case STATUS_BAD_GATEWAY =>
		return "Bad Gateway";
	case STATUS_SERVICE_UNAVAILABLE =>
		return "Service Unavailable";
	case STATUS_GATEWAY_TIMEOUT =>
		return "Gateway Timeout";
	case STATUS_HTTP_VERSION_NOT_SUPPORTED =>
		return "HTTP Version Not Supported";
	case =>
		return "Unknown status";
	};
};