ESPAsyncWebserver 处理程序示例（String 查询参数）

此示例基于我们的基本示例并展示如何使用 String 查询参数，例如 http://192.168.1.112/api/test?param=abc123

espasyncwebserver_string_param.cpp

server.on("/api/test", HTTP_GET, [](AsyncWebServerRequest *request) {
    String param = request->getParam("param")->value();
    // TODO：用 param 做些什么！

    // 以 JSON {"status": "ok"} 响应
    AsyncResponseStream *response = request->beginResponseStream("application/json");
    DynamicJsonDocument json(1024);
    json["status"] = "ok";
    json["param"] = param;
    serializeJson(json, *response);
    request->send(response);
});

server.on("/api/test", HTTP_GET, [](AsyncWebServerRequest *request) {
    String param = request->getParam("param")->value();
    // TODO：用 param 做些什么！

    // 以 JSON {"status": "ok"} 响应
    AsyncResponseStream *response = request->beginResponseStream("application/json");
    DynamicJsonDocument json(1024);
    json["status"] = "ok";
    json["param"] = param;
    serializeJson(json, *response);
    request->send(response);
});

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