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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright 2016-2025 Hristo Gochkov, Mathieu Carbou, Emil Muratov
//
// Show how to sue Middleware
//
#include <Arduino.h>
#ifdef ESP32
#include <AsyncTCP.h>
#include <WiFi.h>
#elif defined(ESP8266)
#include <ESP8266WiFi.h>
#include <ESPAsyncTCP.h>
#elif defined(TARGET_RP2040) || defined(TARGET_RP2350) || defined(PICO_RP2040) || defined(PICO_RP2350)
#include <RPAsyncTCP.h>
#include <WiFi.h>
#endif
#include <ESPAsyncWebServer.h>
static AsyncWebServer server(80);
// New middleware classes can be created!
class MyMiddleware : public AsyncMiddleware {
public:
void run(AsyncWebServerRequest *request, ArMiddlewareNext next) override {
Serial.printf("Before handler: %s %s\n", request->methodToString(), request->url().c_str());
next(); // continue middleware chain
Serial.printf("After handler: response code=%d\n", request->getResponse()->code());
}
};
void setup() {
Serial.begin(115200);
#ifndef CONFIG_IDF_TARGET_ESP32H2
WiFi.mode(WIFI_AP);
WiFi.softAP("esp-captive");
#endif
// add a global middleware to the server
server.addMiddleware(new MyMiddleware());
// Test with:
//
// - curl -v http://192.168.4.1/ => 200 OK
// - curl -v http://192.168.4.1/?user=anon => 403 Forbidden
// - curl -v http://192.168.4.1/?user=foo => 200 OK
// - curl -v http://192.168.4.1/?user=error => 400 ERROR
//
AsyncCallbackWebHandler &handler = server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
Serial.printf("In Handler: %s %s\n", request->methodToString(), request->url().c_str());
request->send(200, "text/plain", "Hello, world!");
});
// add a middleware to this handler only to send 403 if the user is anon
handler.addMiddleware([](AsyncWebServerRequest *request, ArMiddlewareNext next) {
Serial.println("Checking user=anon");
if (request->hasParam("user") && request->getParam("user")->value() == "anon") {
request->send(403, "text/plain", "Forbidden");
} else {
next();
}
});
// add a middleware to this handler that will replace the previously created response by another one
handler.addMiddleware([](AsyncWebServerRequest *request, ArMiddlewareNext next) {
next();
Serial.println("Checking user=error");
if (request->hasParam("user") && request->getParam("user")->value() == "error") {
request->send(400, "text/plain", "ERROR");
}
});
server.begin();
}
// not needed
void loop() {
delay(100);
}
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