[英]ESP8266 WiFiClient simple HTTP GET
我正在研究使用 ESP8266 和ESP8266WiFi 庫閱讀網頁的簡單問題。
我在示例中只更改了幾行,不知道是什么問題。 那是我的代碼:
include <ESP8266WiFi.h>
const char* ssid = "WiwoNET";
const char* password = "xxxxxxx";
const char* host = "https://pure-caverns-1350.herokuapp.com";
void setup() {
Serial.begin(115200);
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
int value = 0;
void loop() {
delay(5000);
++value;
Serial.print("connecting to ");
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;
}
// We now create a URI for the request
String url = "/stan";
Serial.print("Requesting URL: ");
Serial.println(url);
// This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
delay(10);
// Read all the lines of the reply from server and print them to Serial
Serial.println("Respond:");
while(client.available()){
String line = client.readStringUntil('\r');
Serial.print(line);
}
Serial.println();
Serial.println("closing connection");
}
我在串行監視器中看到的是:
Connecting to WiwoNET
.......
WiFi connected
IP address:
192.168.0.111
connecting to https://pure-caverns-1350.herokuapp.com
Requesting URL: /stan
Informacja zwrotna:
HTTP/1.1 400 Bad Request
Connection: close
Server: Cowboy
Date: Thu, 03 Dec 2015 23:38:59 GMT
Content-Length: 0
closing connection
我正在查看heroku的日志,但那里沒有顯示任何內容。 在此先感謝您的任何幫助。
但是,您錯過了一個關鍵部分。 host
值不得以 URI 樣式的方案開頭,例如http://
或https://
。 再次查看示例並使用
const char* host = "pure-caverns-1350.herokuapp.com";
反而。
如果在您的控制台中運行curl -v http://pure-caverns-1350.herokuapp.com/stan
,您可以非常清楚地看到 HTTP 引擎蓋下發生的事情。
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