http - 从 Arduino 发送适当的 Post 请求

Question

我正在尝试使用以太网屏蔽从我的 Arduino Mega 发送一个 Post 请求，我已经在互联网上尝试了很多代码，但我还没有完成

也已经从 NodeMCU-ESP8266 上完成了，但我不知道为什么 mega 变得如此棘手

从这段代码开始，一切顺利，除了我从未收到 POST 请求，我正在使用这个网站“requestcatcher”来测试 POST 请求

#include <Ethernet.h>
#include <SPI.h>

// Conf. mac 
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

// Server to Post
char server[] = "http://abc.requestcatcher.com/test";   

// Starting Ethernet client
EthernetClient client;

// =============== Connecting to internet =============== //

void setup() {
  // Open serial communications and wait for port to open:
  // wait for serial port to connect. Needed for native USB port only
  Serial.begin(9600);
  while (!Serial) {
    ; 
  }

  // Connecting to internet
  if (Ethernet.begin (mac) == 0) {
    Serial.println("Can’t connect via DHCP");
  }

  // Give the Ethernet shield a second to initialize
  delay(1000);
  // Printing the IP Adress
  Serial.print ("IP Address: ");
  Serial.println(Ethernet.localIP());

}

/////============= Sending Post request ============= ////

void loop() {

  Serial.println(" - Post request in process - ");

  if (client.connect(server, 80) { 
        Serial.print(" Sending Post request ");
        client.println("POST /test HTTP/1.1"); 
        client.println("Host: abc.requestcatcher.com/"); 
        client.println("Content-Type: application/x-www-form-urlencoded"); 
        client.println("Content-Length: "); 
        client.println(); 
  } 
  else {
    Serial.println("Can’t reach the server");
  }
  // Wait 10 secs
  delay(10000); 
}

Arduino 像这样通过串行打印

IP Adress: 192.168.100.40
- Post request in process -
Sending Post request
- Post request in process -
Sending Post request
- Post request in process -
Sending Post request

所以我认为这意味着 Arduino 成功连接到互联网并且“client.connect(server, 80)”变为真，因为它打印“发送帖子请求”，但我不知道为什么请求捕获器永远无法获取任何发布请求，我使用在线应用程序以及 NodeMCU 测试了“requestcatcher”，它从除 Arduino 之外的所有应用程序获取发布请求，所以我认为这里一定有问题:

   client.println("POST /test HTTP/1.1"); 
   client.println("Host: abc.requestcatcher.com/");        
   client.println("Content-Type: application/x-www-form-urlencoded"); 
   client.println("Content-Length: "); 
   client.println(); 

请帮忙，任何提示都会很有帮助

Answer 1

您必须删除这部分代码中的 ; 和右括号 if (client.connect(server, 80); { => if (client .connect(server, 80)) {...}