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ESPAsyncWebserver handler example with String query argument

This example is based on our basic example and shows how to use an String query parameter, e.g. 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: Do something with param!

    // Respond with JSON {"status": "ok"}
    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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