File: serverTiming.sjs

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var responseServerTiming = [
  { metric: "metric1", duration: "123.4", description: "description1" },
  { metric: "metric2", duration: "456.78", description: "description2" },
];
var trailerServerTiming = [
  { metric: "metric3", duration: "789.11", description: "description3" },
  { metric: "metric4", duration: "1112.13", description: "description4" },
];

function createServerTimingHeader(headerData) {
  var header = "";
  for (var i = 0; i < headerData.length; i++) {
    header +=
      "Server-Timing:" +
      headerData[i].metric +
      ";" +
      "dur=" +
      headerData[i].duration +
      ";" +
      "desc=" +
      headerData[i].description +
      "\r\n";
  }
  return header;
}

function handleRequest(request, response) {
  var body = "c\r\ndata reached\r\n3\r\nhej\r\n0\r\n";

  response.seizePower();
  response.write("HTTP/1.1 200 OK\r\n");
  response.write("Content-Type: text/plain\r\n");
  response.write(createServerTimingHeader(responseServerTiming));

  response.write("Transfer-Encoding: chunked\r\n");
  response.write("\r\n");
  response.write(body);
  response.write(createServerTimingHeader(trailerServerTiming));
  response.write("\r\n");
  response.finish();
}