发出 POST 请求 returns "text is empty"

Question

我正在尝试在我的 ESP8266 上使用 WiFiClientSecure 发送 POST 请求。似乎连接本身有效，但是当我发送请求时，我收到以下消息：

{"message":"text is empty (possibly HTTP/0.9)","traceId":"576eb1f7-3a18-7759-eaa1-8d0675f14fea"}

这是发送请求的代码部分。知道我做错了什么吗（net 是我的 WiFiClientSecure 实例）？

  if(!net.connect("xxx-ats.iot.eu-central-1.amazonaws.com", 8443)){
    Serial.println("connection failed");
    char err_buf[1024];
    Serial.println(net.getLastSSLError(err_buf,1024));
    Serial.printf("ssl_error: %s\n", err_buf);
    return;
  }else{
    Serial.println("Yeah!");
  }
  net.print("POST /topics/gaswarner?qos=1 HTTP/1.1\n" \
               "Host: xxx-ats.iot.eu-central-1.amazonaws.com:8443\n" \
               "User-Agent: curl/7.74.0\n" \
               "Accept: */*\n" \
               "Content-Type: application/json\n" \
               "Content-Length: 19\n\n" \
               "{\"message\":\"hello\"}\n" \
               "Connection: close\n\n");
  Serial.println("Sent out..");

  while (net.connected()) {
    String line = net.readStringUntil('\n');
    if (line == "\r") {
      Serial.println("headers received");
      break;
    }
  }

  Serial.println("reply was:");
  Serial.println("==========");
  String line;
  while(net.available()){
    line = net.readStringUntil('\n');  //Read Line by Line
    Serial.println(line); //Print response
  }
  Serial.println("==========");
  Serial.println("closing connection");

使用 curl 发送该请求按预期工作：

curl.exe -v -H "Content-Type: application/json" --tlsv1.2 --cacert "pathtoCaCert" --cert "pathToCert" --key "pathToKey" --request POST --data "{ "message": "Hello, world" }" "https://xxx-ats.iot.eu-central-1.amazonaws.com:8443/topics/gaswarner?qos=1"

提前致谢

Answer 1

我测试了@hcheung 解决方案并且它有效！因此，为了参考，我将在此处提供代码。请记住，使用 ESP8266HTTPClient 会是一个更简洁的解决方案：

  net.print("POST /topics/gaswarner?qos=1 HTTP/1.1\n" \
               "Host: xxx-ats.iot.eu-central-1.amazonaws.com:8443\n" \
               "User-Agent: curl/7.74.0\n" \
               "Accept: */*\n" \
               "Content-Type: application/json\n" \
               "Content-Length: 19\n" \
               "Connection: close\n\n"\
               "{\"message\":\"hello\"}\n");

发出 POST 请求 returns "text is empty"

Sending out POST request returns with "text is empty"

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amazon-web-services

iot

esp8266