Function onerror

out/cli.cjs:26120–26124

(err)

          reject(new Error("Proxy connection ended before receiving CONNECT response"));
        }
        function onerror(err) {
          cleanup();
          debug5("onerror %o", err);
          reject(err);
        }
        function ondata(b7) {
          buffers.push(b7);
          buffersLength += b7.length;