Thingspeak connection code question

Projects Programming
1

I use Thingspeak without its library, with following code. The code is working for years but I recently found out there are a few things that need correction.

  1. is a delay needed after client.stop() ? How much ?
  2. is it advisable (or not) to use client.flush() before client.stop() ?
  3. is the use of \r and \n correct in my code ?
  4. should I use client.print(postStr.length()); or client.print(String(postStr.length())); ?

My code:

    if (client.connect(server, 80)) // "184.106.153.149" or api.thingspeak.com
    {
      String postStr = apiKey;
      postStr += "&field1=";
      postStr += String(valveState);
      postStr += "&field2=";
      postStr += String(hiLvlState);
      postStr += "&field3=";
      postStr += String(loLvlState);
      postStr += "&field4=";
      postStr += String(valveDelayedClosureExecution);
      postStr += "&field5=";
      postStr += String(alarmState);
      postStr += "&field6=";
      postStr += String(get3231Temp());
      postStr += "&field7=";
      postStr += String(valveOpenTime);
      postStr += "&field8=";
      postStr += String(waterUsage);
      postStr += "\r\n\r\n";

      client.print("POST /update HTTP/1.1\n");
      client.print("Host: api.thingspeak.com\n");
      client.print("Connection: close\n");
      client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
      client.print("Content-Type: application/x-www-form-urlencoded\n");
      client.print("Content-Length: ");
      // client.print(String(postStr.length()));
      client.print(postStr.length());
      client.print("\n\n");
      client.print(postStr);
      Serial.println(F("Thingspeak executed"));
      delay(4000);
    }
    client.flush();
    client.stop();
    delay(5):
2

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