如何使用ESP32上的http客户端请求进行正确的POST（错误：“sitename的DNS失败”）

我正在尝试向我使用ESP32设置的站点发送一个POST请求，其中包含2条数据。我曾尝试使用网站“reqbin.com”发送包含相同数据的POST请求，因此我认为数据本身不是问题所在

下面是我的代码：

char ssid[] = "{{name}}";
char pass[] = "{{pass}}";
int port = 8080;
WiFiClient wifi;

void setup()
{
delay(1000);
    WiFi.mode(WIFI_OFF); //Prevents reconnection issue (taking too long to connect)
    delay(1000);
    WiFi.mode(WIFI_STA); //This line hides the viewing of ESP as wifi hotspot

    WiFi.begin(ssid, pass); //Connect to your WiFi router
    Serial.println("");

    Serial.print("Connecting");
    // Wait for connection
    while (WiFi.status() != WL_CONNECTED)
    {
        delay(500);
        Serial.print(".");
    }

    //If connection successful show IP address in serial monitor
    Serial.println("");
    Serial.print("Connected to ");
    Serial.println(ssid);
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
}

void loop()
{
String serverAddress = "sitename.com/data.php";
    String contentType = "text/plain"
    String postData = "t=26.1 h=25.6";
    HttpClient http = HttpClient(wifi, serverAddress, port);
    http.beginRequest(); //Specify request destination
    int httpCode = http.post("/", contentType, postData);
    Serial.println("httpCode = " + httpCode);
    if (httpCode > 0)
    {
        String response = http.responseBody();
        Serial.println("httpCode === " + httpCode);
        Serial.println(response);
    }
    else
    {
        Serial.println("Error on POST request");
        Serial.println(httpCode);
    }
    http.endRequest();
}

当使用reqbin时，我得到状态200，站点返回。但是，在ESP32上，它返回错误：

[E][WiFiGeneric.cpp:654] hostByName(): DNS Failed for sitename.com/data.php

socket error on fd 57, errno: 104, "Connection reset by peer"

我不确定我请求的语法是否不正确

---

更新：更改了我的循环并将服务器地址更改为：

String serverAddress = "sitename.com";
    String contentType = "text/plain";
    String postData = "t=26.1 h=25.6";
    HttpClient http = HttpClient(wifi, serverAddress, port);
    http.beginRequest(); //Specify request destination
    int httpCode = http.post("/data.php", contentType, postData);
    Serial.println("httpCode = " + httpCode);

现在获取错误：

[E][WiFiGeneric.cpp:654] hostByName(): DNS Failed for sitename.com/data.php

socket error on fd 57, errno: 104, "Connection reset by peer"

编辑代码断路器：

String serverAddress = "sitename.com";
HttpClient http = HttpClient(wifi, serverAddress, port);
String response;
int statusCode = 0;

Setup has stayed the same.

void loop()
{
String contentType = "application/x-www-form-urlencoded";
    // String postData = temp + " " + humid;
    String postData = "?t=26.1&h=25.6";
    http.post("/data.php", contentType, postData);
    // read the status code and body of the response
    statusCode = http.responseStatusCode();
    response = http.responseBody();

    Serial.print("Status code: ");
    Serial.println(statusCode);
    Serial.print("Response: ");
    Serial.println(response);
}

---

我猜服务器需要url编码的数据，而不是纯文本。所以试试看 在安装之前定义以下内容（）

在你的循环中，你构建帖子如下

String contentType = "application/x-www-form-urlencoded";
String postData = "?t=26.1&h=25.6";
http.post("/data.php", contentType, postData);

然后阅读回答

  // read the status code and body of the response
  statusCode = http.responseStatusCode();
  response = http.responseBody();

  Serial.print("Status code: ");
  Serial.println(statusCode);
  Serial.print("Response: ");
  Serial.println(response);

如果可以的话，用如下的字符数组替换字符串类

char serverAddress[] = "www.test.com";  // server address

---

我已经做了您建议的更改，但仍然有错误：[E][WiFiClient.cpp:258]connect（）：fd 54上的套接字错误，错误号：104，“由对等方重置连接”不确定原因，但不管我做了多少修改，它似乎都会发生。你能发布你的代码的最后版本吗？很难达到移动目标，而且它真的是http的8080端口吗？这通常是websocket，所以端口应该是8080，以便添加到主帖子中以获得更好的格式，1分钟将端口更改为80，注意如何使用？X=值&Y=值来连接post数据