Get Sensor from DB

float getActiveSensorTemperature(String serverName)
{
    WiFiClient wclient;
    HTTPClient http;
    String json, timestamp, uname = "";
    float temp = -1;
    char result[64];
    DynamicJsonDocument document(1024);
    http.begin(wclient, serverName);
    http.addHeader("Content-Type", "application/text");
    int httpResponseCode = http.GET();
    if (httpResponseCode > 0) {
        json = http.getString();
        deserializeJson(document, json);
        JsonArray array = document.as<JsonArray>();
        temp = document[0]["temperature"].as<float>();
        timestamp = document[0]["timestamp"].as<String>();
        uname = document[0]["uname"].as<String>();
        Serial.print(getTimestamp() + " : Room temperature (from database): "); Serial.print(temp); Serial.println(" °C - (" + uname + " - " + timestamp + ")");
    } else
        Serial.println(getTimestamp() + " : No response " + httpResponseCode);
    http.end();
    return temp;
}