Problem updating channel. HTTP error code -301

Question

#include "ThingSpeak.h"
#include <ESP8266WiFi.h>

char ssid[] = "F";   // your network SSID (name)
char pass[] = "qwerty";   // your network password
int keyIndex = 0;            // your network key Index number (needed only for WEP)
WiFiClient  client;

unsigned long myChannelNumber = 919998; //SECRET_CH_ID;
const char * myWriteAPIKey = "1D95P000GF21W88Z"; // SECRET_WRITE_APIKEY;


int value1 = 0, value2 = 0, value3 = 0, value4 = 0;

void setup()
{
  Serial.begin(9600);

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);  // Initialize ThingSpeak

  while (!Serial) {
    ;
  }
}

void loop()
{
  // Connect or reconnect to WiFi
  if (WiFi.status() != WL_CONNECTED)
  {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(SECRET_SSID);
    while (WiFi.status() != WL_CONNECTED)
    {
      WiFi.begin(ssid, pass);  
      Serial.print(".");
      delay(5000);
    }
    Serial.println("
Connected.");
  }

  while (!Serial.available());
  String incommingStr = Serial.readStringUntil('
');
  Serial.println(incommingStr);


  // splitting incomingStr
  int data1 = incommingStr.indexOf(',');  //finds location of first ,
  int value1 = incommingStr.substring(0, data1).toInt();   //captures first data String
  int data2 = incommingStr.indexOf(',', data1 + 1 ); //finds location of second ,
  int value2 = incommingStr.substring(data1 + 1, data2 + 1).toInt(); //captures second data String
  int data3 = incommingStr.indexOf(',', data2 + 1 );
  int value3 = incommingStr.substring(data2 + 1, data3 + 1).toInt();
  int data4 = incommingStr.indexOf(',', data3 + 1 );
  int value4 = incommingStr.substring(data3 + 1).toInt(); //captures remain part of data after last ,

  // set the fields with the values
  ThingSpeak.setField(1, value1);
  ThingSpeak.setField(2, value2);
  ThingSpeak.setField(3, value3);
  ThingSpeak.setField(4, value4);

  Serial.println(String(value1) + " " + String(value2) + " " + String(value3) + " " + String(value4));

  // set the status
  ThingSpeak.setStatus("4 fields added.");

  // write to the ThingSpeak channel
  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if (x == 200)
  {
    Serial.println("Channel update successful.");
  }
  else
  {
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }

  delay(20000);
}

Problem updating channel. HTTP error code -301

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Problem updating channel. HTTP error code -301

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