Method onHeaderField

github-actions/browserstack/set-browserstack-env.js:6209–6217

(buf)

          if (client[kRunning] === 0) {
            util.destroy(socket, new SocketError("bad response", util.getSocketInfo(socket)));
            return -1;
          }
          const request = client[kQueue][client[kRunningIdx]];
          if (!request) {
            return -1;
          }
          request.onResponseStarted();
        }
        onHeaderField(buf) {
          const len = this.headers.length;
          if ((len & 1) === 0) {
            this.headers.push(buf);