Nodemcu Esp8266发送HTTP请求失败了是为什么 ?

我尝试发送 HTTP 请求，但它失败了
HTTP 代码返回 -1
尽管 URL 在 Postman 上成功运行并且 Wifi 成功连接
我正在使用 WIFI 管理器并且它成功连接到网络
注意：mysite2020 是一个例子，但我的主机在 POSTMAN 上运行良好，并且在数据库中发布了数据
这是我的代码
代码：全选#include
#include
#include
#include
#include
#include

IPAddress staticIP750_100(192,168,1,16);
IPAddress gateway750_100(192,168,1,1);
IPAddress subnet750_100(255,255,255,0);

   HTTPClient http;



#define ONE_WIRE_BUS 2 // DS18B20 on NodeMCU pin D4

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);

float temp_0;
  const char* host = "http://mysite2020.info";
  

void setup()
{


  Serial.begin(115200);
   WiFiManager wifimanger ;

  DS18B20.begin();

Wire.begin(D2, D1)


  WiFi.mode(WIFI_STA);

  wifimanger.autoConnect("Inlet Device","12345");
  
  while ((!(WiFi.status() == WL_CONNECTED))){
    delay(300);
    Serial.println("...");

  }

  Serial.println("WiFi connected");  

  WiFi.config(staticIP750_100, gateway750_100, subnet750_100);
  WiFi.hostname("Inlet Device") ;
  
delay(3000);
Serial.println("Welcome To Device No : 1");

  Serial.println("IP address: ");
    Serial.println(WiFi.localIP());


    Serial.println("Your Gateway is : ");

    Serial.println((WiFi.gatewayIP().toString().c_str()));

  Serial.println("Your Hostname is : ");

  Serial.println((WiFi.hostname()));


delay(3000);

   Serial.println("Welcome to my  Project!");

delay(3000);


}
void loop() {
  
Serial.println(host); // Use WiFiClient class to create TCP connections
WiFiClient client;
const int httpPort = 80;
if (!client.connect(host, httpPort))
{
Serial.println("connection failed");
return;
}
Serial.print("Requesting URL: ");


sendtemp ();
}

void sendtemp ()
{

temp_0=23.26;
String  url = "http://mysite2020.info/Api/insert_mssqlserver.php?Reading=" + String(temp_0);

  Serial.println(url);
    http.begin(url);
http.addHeader("Content-Type", "application/x-www-form-urlencoded");
auto httpCode = http.GET();
Serial.println(httpCode); //Print HTTP return code
String payload = http.getString();
Serial.println(payload); //Print request response payload
http.end(); //Close connection Serial.println();
Serial.println("closing connection");

  delay(500);

}