为什么我无法发送get请求。它总是响应400。URL还可以，没有问题。实际上我需要使用get请求发送数据。我已经尽了最大努力找到解决方案，但我对此一无所知。请任何人都能帮助我使用代码
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>//this header is used to send get request and see response
#include <WiFiClient.h>
const char* ssid = "myssid";
const char* password = "mypswd";
String host_url="https://api-test.technofield.net";
String url1="/api/data?token=TEST_TOKEN_123&data=";
int httpPort=80;
void setup() {
Serial.begin(9600);
WiFi.begin(ssid, password); //Connect to my WiFi router
Serial.println("");
Serial.print("Connecting"); //initiall step just displaying connecting
// Wait for connection
while (WiFi.status() != WL_CONNECTED) { //the llop wiil execute till wifi is not connected
delay(500);
Serial.print(".");
}
//If connection successful show IP address in serial monitor
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);// connected to given ssid
Serial.print("IP address: ");
Serial.println(WiFi.localIP()); //IP address assigned to your ESP
}
void loop(){
if(WiFi.status()==WL_CONNECTED){ //we will perform action if wifi is connected
HTTPClient http; //intialize object of HTTPclient which is importent
String data="Sunil Kumar Yadav";
//String token="TEST_TOKEN_123";
url1=url1+data;
//full APi url is created you can manipulate those above data and token vaiable.
http.begin(host_url,httpPort,url1);//specify the request,begin the request
int httpCode=http.GET(); //Send the request
// if (httpCode>0){ //lets see the response from server
// String payload = http.getString();//store response on payload variable
// Serial.print("==============");//just for seperating the wifi connection status and server response
// Serial.println(payload);//print the response payload
// }
Serial.print(httpCode);
http.end();//if there is begin there will be end ,it will Close the connection
}
delay(500); //send the request in every 2sec, you can change it according to your need
//you can also specify the time so that it will be easy to identify on which time data is send
}
以下是输出：
301
==============<html>
<head><title>301 Moved Permanently</title></head>
<body>
<center><h1>301 Moved Permanently</h1></center>
<hr><center>nginx</center>
</body>
</html>
我不知道怎么解决这个问题。
这里有一个(几个(如何使用HTTPs的示例：https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266HTTPClient/examples/BasicHttpsClient/BasicHttpsClient.ino
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClientSecure.h>
const char* ssid = "myssid";
const char* password = "mypswd";
String url = "https://api-test.technofield.net/api/data?token=TEST_TOKEN_123&data=";
void setup() {
Serial.begin(115200);
WiFi.begin(ssid, password);
Serial.println("");
Serial.print("Connecting");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
}
void loop() {
if (WiFi.status() == WL_CONNECTED) {
WiFiClientSecure client;
client.setInsecure();
HTTPClient https;
String data = "Sunil%20Kumar%20Yadav";
String fullUrl = url + data;
Serial.println("Requesting " + fullUrl);
if (https.begin(client, fullUrl)) {
int httpCode = https.GET();
Serial.println("============== Response code: " + String(httpCode));
if (httpCode > 0) {
Serial.println(https.getString());
}
https.end();
} else {
Serial.printf("[HTTPS] Unable to connectn");
}
}
delay(5000);
}
- 导入
WiFiClientSecure.h - 请注意，我是如何设置
client.setInsecure();的，您不应该在实际代码中设置它，而应该为我们设置端点的根证书，如下所示https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266WiFi/examples/HTTPSRequest/HTTPSRequest.ino#L29 - 您应该像
String data = "Sunil%20Kumar%20Yadav"那样对数据参数进行URL编码