Method _prepareRequest

lib/index.js:2885–2911

(method, requestUrl, headers)

        return this._getAgent(parsedUrl);
    }
    _prepareRequest(method, requestUrl, headers) {
        const info = {};
        info.parsedUrl = requestUrl;
        const usingSsl = info.parsedUrl.protocol === 'https:';
        info.httpModule = usingSsl ? https : http;
        const defaultPort = usingSsl ? 443 : 80;
        info.options = {};
        info.options.host = info.parsedUrl.hostname;
        info.options.port = info.parsedUrl.port
            ? parseInt(info.parsedUrl.port)
            : defaultPort;
        info.options.path =
            (info.parsedUrl.pathname || '') + (info.parsedUrl.search || '');
        info.options.method = method;
        info.options.headers = this._mergeHeaders(headers);
        if (this.userAgent != null) {
            info.options.headers['user-agent'] = this.userAgent;
        }
        info.options.agent = this._getAgent(info.parsedUrl);
        // gives handlers an opportunity to participate
        if (this.handlers) {
            for (const handler of this.handlers) {
                handler.prepareRequest(info.options);
            }
        }
        return info;
    }
    _mergeHeaders(headers) {
        if (this.requestOptions && this.requestOptions.headers) {
            return Object.assign({}, lowercaseKeys(this.requestOptions.headers), lowercaseKeys(headers || {}));