Problem with Ublox NEO-6M GPS

#include
#include <ESP8266HTTPClient.h>
#include <SoftwareSerial.h>
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
WiFiClient client;
static const int RXPin = 4, TXPin = 3;// Here we make pin 4 as RX of arduino & pin 3 as TX of arduino
static const uint32_t GPSBaud = 9600;

SoftwareSerial ss(RXPin, TXPin);
TinyGPSPlus gps;
const char* ssid = "0000";
const char* password = "000000";

const char* serverName = "http://0000000.com/pro5/post-data.php";

String apiKeyValue = "00000000";

String sensorName = "Distance sensor";
String sensorLocation = "office";

long duration;

void setup()
{
pinMode(PulseSensorPurplePin, OUTPUT);
Serial.begin(9600);
ss.begin(GPSBaud);
WiFi.begin(ssid, password);

}

void loop()
{

if(WiFi.status()== WL_CONNECTED){
HTTPClient http;

http.begin(client,serverName);

http.addHeader("Content-Type", "application/x-www-form-urlencoded");


String httpRequestData = "api_key=" + apiKeyValue + "&SensorData=" + sensorName
                      + "&LocationData=" + sensorLocation + "&value1=" + duration
                      + "&value2=" +duration + "&value3=" + "NULL" + "";


Serial.println(duration);


int httpResponseCode = http.POST(httpRequestData);

http.end();
}
delay(1000);
if (ss.available() > 0)
if (gps.encode(ss.read()))
displayInfo();

if (millis() > 5000 && gps.charsProcessed() < 10)
{
Serial.println(F("No GPS detected: check wiring."));
while(true);
}
}

void displayInfo()
{
Serial.print(F("Location: "));
if (gps.location.isValid())
{
Serial.print(gps.location.lat(), 6);
Serial.print(F(","));
Serial.print(gps.location.lng(), 6);
}
else
{
Serial.print(F("INVALID"));
}

Serial.println();
}