404在ngrok上找不到

问题描述

我对ngrok和arduino有问题，我发送一条消息，但是当我打开ngrok时，它说:404 not found

I have a problem with ngrok and arduino, i send a message but when i open ngrok it says: 404 Not found

我认为端口可能有问题，我使用4040，因为ngrok打开localhost:4040，但是我不知道这是不是真的. Java上的服务器端应用程序使用端口80

I think it could be problem with port, I use 4040 because ngrok open localhost:4040 but i don't know if it is true. The server-side app on java use port 80

#include <ESP8266HTTPClient.h>
#include <ESP8266WiFi.h>

/* wifi network name */
char* ssidName = "mywifi";
/* WPA2 PSK password */
char* pwd = "mypwd";
/* service IP address */
char* address = "http://cf3c013e.ngrok.io";

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssidName, pwd);
  Serial.print("Connecting...");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected: \n local IP: "+WiFi.localIP());
}

int sendData(String address, float value, String place){
   HTTPClient http;
   http.begin(address + "/api/data");
   http.addHeader("Content-Type", "application/json");
   String msg =
    String("{ \"value\": ") + String(value) +
    ", \"place\": \"" + place +"\" }";
   int retCode = http.POST(msg);
   http.end();

   String payload = http.getString();
   Serial.println(payload);
   return retCode;
}

void loop() {
 if (WiFi.status()== WL_CONNECTED){

   /* read sensor */
   float value = (float) analogRead(A0) / 1023.0;

   /* send data */
   Serial.print("sending "+String(value)+"...");
   int code = sendData(address, value, "home");

   /* log result */
   if (code == 200){
     Serial.println("ok");
   } else {
     Serial.println("error");
   }
 } else {
   Serial.println("Error in WiFi connection");
 }

 delay(5000);

}

推荐答案

从char* address = "http://cf3c013e.ngrok.io";

地址中的http声明加倍可能导致404.

The double-up of http declaration in the address is likely causing the 404.

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