string code_description(int code)
{
    switch (code) {
        case 100: return "Continue";
        case 101: return "Switching Protocols";
        case 102: return "Processing";
        case 105: return "Name Not Resolved";

        case 200: return "OK";
        case 201: return "Created";
        case 202: return "Accepted";
        case 203: return "Non-Authoritative Information";
        case 204: return "No Content";
        case 205: return "Reset Content";
        case 206: return "Partial Content";
        case 207: return "Multi-Status";
        case 226: return "IM Used";

        case 300: return "Multiple Choices";
        case 301: return "Moved Permanently";
        case 302: return "Moved Temporarily";
        case 303: return "See Other";
        case 304: return "Not Modified";
        case 305: return "Use Proxy";
        case 307: return "Temporary Redirect";

        case 400: return "Bad Request";
        case 401: return "Unauthorized";
        case 402: return "Payment Required";
        case 403: return "Forbidden";
        case 404: return "Not Found";
        case 405: return "Method Not Allowed";
        case 406: return "Not Acceptable";
        case 407: return "Proxy Authentication Required";
        case 408: return "Request Timeout";
        case 409: return "Conflict";
        case 410: return "Gone";
        case 411: return "Length Required";
        case 412: return "Precondition Failed";
        case 413: return "Request Entity Too Large";
        case 414: return "Request-URI Too Large";
        case 415: return "Unsupported Media Type";
        case 416: return "Requested Range Not Satisfiable";
        case 417: return "Expectation Failed";
        case 418: return "I'm a teapot";
        case 422: return "Unprocessable Entity";
        case 423: return "Locked";
        case 424: return "Failed Dependency";
        case 425: return "Unordered Collection";
        case 426: return "Upgrade Required";
        case 428: return "Precondition Required";
        case 429: return "Too Many Requests";
        case 431: return "Request Header Fields Too Large";
        case 434: return "Requested Host Unavailable";
        case 449: return "Retry With";
        case 451: return "Unavailable For Legal Reasons";
        case 456: return "Unrecoverable Error";

        case 500: return "Internal Server Error";
        case 501: return "Not Implemented";
        case 502: return "Bad Gateway";
        case 503: return "Service Unavailable";
        case 504: return "Gateway Timeout";
        case 505: return "HTTP Version Not Supported";
        case 506: return "Variant Also Negotiates";
        case 507: return "Insufficient Storage";
        case 508: return "Loop Detected";
        case 509: return "Bandwidth Limit Exceeded";
        case 510: return "Not Extended";
        case 511: return "Network Authentication Required";

        default: return "Unknown status code";
    }
}