Server returns anything

(Sorry for my English, I’m french)

I have a problem with a httpClient function.
It managed to connect to the server. Then when it comes time to read the data, after a while, the client receives “NOT CONNECTED”, then nothing.
Do you have any idea why?

My code :

String * httpClient (const String txt) {
  IPAddress server(192,168,1,220);
  String retour[] = { "", "", ""};
  
  int iVar = 1;
  boolean startRead = false;
  int iterations = 0;

  Serial.println("Trying to connect");
  if (client.connect(server, 80)) {
    Serial.println("Connected");
    
    client.print("GET /RFID.php?code=");
    client.print(txt);
    client.print(" HTTP/1.1\r\n");
    client.print("HOST: 192.168.1.220");
    client.print("\r\nConnection: close\n\r\n");
    
    while(client.connected()) {
      Serial.print(".");
      
      if (client.available() > 0) {
        char c = client.read();
        Serial.print(c);
  
        if (c == '<' ) {
          startRead = true;
        }
        else if(startRead){
          if(c != '>'){
            retour[iVar - 1].concat(c);
          }
          else{
            Serial.print("Variable recue : "); Serial.println(retour[iVar - 1]);
            startRead = false;
            iVar += 1;
            if (iVar == 4) {
              Serial.println("disconnecting(0)");
              client.flush();
              client.stop();
              return retour;
            }
          }
        }
      }
  
      if (iVar == 2 && startRead == false) {
        iterations ++;
        if(iterations > 10) {
          client.flush();
          client.stop();
          return retour;
        }
      }
    }
  } 
  Serial.println("NOT CONNECTED..");
  client.flush();
  client.stop();
  Serial.println("DONE! FLUSH/STOP.");
}

Then this is what appears in the console:
Trying to connect
Connected
…HNOT CONNECTED…
DONE! FLUSH/STOP.

I use arduino Uno with a wifi shield, which firmware's version is 1.1.0

Are you certain this is not closing the connection prematurely?

      if (iVar == 2 && startRead == false) {
        iterations ++;
        if(iterations > 10) {
          client.flush();
          client.stop();
          return retour;
        }
      }