Function buildHeaders

github-actions/saucelabs/set-saucelabs-env.js:9110–9119

(headers)

        }
        [kDestroy]() {
          return __async(this, null, function* () {
            yield this[kAgent].destroy();
            yield this[kClient].destroy();
          });
        }
      };
      _getUrl = new WeakSet();
      getUrl_fn = function(opts) {
        if (typeof opts === "string") {
          return new URL2(opts);
        } else if (opts instanceof URL2) {
          return opts;
        } else {