Can't fetch data from server using arduino and esp8266

Question

I am trying to fetch some data from my website using esp8266 and Arduino, with the help of WiFiEsp library, I have got data from the website but don't know how to save that data in an array or variable and use it, now I can only see received data on the serial monitor.

 #include "WiFiEsp.h"


#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(6, 7); // RX, TX
#endif

char ssid[] = "moto g";            // your network SSID (name)
char pass[] = "hvats555";        // your network password
int status = WL_IDLE_STATUS;     // the Wifi radio's status

char server[] = "himalayavats.com";

unsigned long lastConnectionTime = 0;
const unsigned long postingInterval = 10000L;

WiFiEspClient client;

void setup()
{
  // initialize serial for debugging
  Serial.begin(115200);
  // initialize serial for ESP module
  Serial1.begin(9600);
  // initialize ESP module
  WiFi.init(&Serial1);

  // check for the presence of the shield
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue
    while (true);
  }

  // attempt to connect to WiFi network
  while ( status != WL_CONNECTED) {
    Serial.print("Attempting to connect to WPA SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network
    status = WiFi.begin(ssid, pass);
  }

  Serial.println("You're connected to the network");

  printWifiStatus();
}

void loop()
{
  // if there's incoming data from the net connection send it out the serial 
port
  // this is for debugging purposes only
  while (client.available()) {
    char c = client.read();
    Serial.print(c);
  }

  // if 10 seconds have passed since your last connection,
  // then connect again and send data
  if (millis() - lastConnectionTime > postingInterval) {
    httpRequest();
  }
}

// this method makes a HTTP connection to the server
void httpRequest()
{
  Serial.println();

  // close any connection before send a new request
  // this will free the socket on the WiFi shield
   client.stop();

  // if there's a successful connection
  if (client.connect(server, 80)) {
    Serial.println("Connecting...");

    // send the HTTP PUT request
    client.println(F("GET /to_fetch/system_info.json HTTP/1.1"));
    client.println(F("Host: himalayavats.com"));
    client.println("Connection: close");
    client.println();

    // note the time that the connection was made
    lastConnectionTime = millis();
  }
  else {
    // if you couldn't make a connection
    Serial.println("Connection failed");
  }
}


void printWifiStatus()
{
  // print the SSID of the network you're attached to
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

 // print the received signal strength
  long rssi = WiFi.RSSI();
  Serial.print("Signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

Response from arduino(in serial monitor):-

[WiFiEsp] Initializing ESP module
[WiFiEsp] Initilization successful - 1.3.0
Attempting to connect to WPA SSID: moto g
[WiFiEsp] Connected to moto g
You're connected to the network
SSID: moto g
IP Address: 192.168.43.61
Signal strength (RSSI):-372 dBm

[WiFiEsp] Connecting to himalayavats.com
Connecting...
HTTP/1.1 200 OK
Date: Fri, 05 Jan 2018 10:19:46 GMT
Server: Apache
ETag: "12c077d-12-55dc4cfa4fffd"
Accept-Ranges: bytes
Content-Length: 18
Vary: User-Agent
Connection: close
Content-Type: application/json

{"power" : "high"}      // <-- i wanna fetch this

NOTE:- Whenever I try to add anything in loop function for example:-

int i = 0;
while(client.avilable()){
    c = client.read();
    serverResponse[i] = c; // trying to save output in an array
    i++;
}

The module doesn't even fetch data from the server it keeps restarting itself. Output from arduino after adding above code in loop funtion:-

[WiFiEsp] Initializing ESP module
[WiFiEsp] Initilization successful - 1.3.0
Attempting to connect to WPA SSID: moto g
[WiFiEsp] Connected to moto g
You're connected to the network

[WiFiEsp] Initializing ESP module
[WiFiEsp] Initilization successful - 1.3.0
Attempting to connect to WPA SSID: moto g
[WiFiEsp] Connected to moto g
You're connected to the network

[WiFiEsp] Initializing ESP module
[WiFiEsp] Initilization successful - 1.3.0
Attempting to connect to WPA SSID: moto g
[WiFiEsp] Connected to moto g
You're connected to the network

This repeating again and again

Answer 1

When Arduinos unexpectedly restarts it is usually because you have drawn too much power or have caused a segmentation error or BSOD in Windows terms. You aren't drawing to much power, so I suspect you are accessing elements of the array outside those that you should be. Check that i never exceeds the maximum size of serverResponse, because:

char serverResonse[10]
for int i - 0; i < 50; i++)
  serverResponse[i] = 42;  // This will crash on the 11th loop.

I can't say if the above code will cause a restart, but that's dependent on what was using the 11th byte of the array before it got stomped on.