// SPDX-License-Identifier: LGPL-3.0-or-later // Copyright 2016-2025 Hristo Gochkov, Mathieu Carbou, Emil Muratov // // How to use CORS middleware // #include #ifdef ESP32 #include #include #elif defined(ESP8266) #include #include #elif defined(TARGET_RP2040) || defined(TARGET_RP2350) || defined(PICO_RP2040) || defined(PICO_RP2350) #include #include #endif #include static AsyncWebServer server(80); static AsyncCorsMiddleware cors; void setup() { Serial.begin(115200); #ifndef CONFIG_IDF_TARGET_ESP32H2 WiFi.mode(WIFI_AP); WiFi.softAP("esp-captive"); #endif cors.setOrigin("http://192.168.4.1"); cors.setMethods("POST, GET, OPTIONS, DELETE"); cors.setHeaders("X-Custom-Header"); cors.setAllowCredentials(false); cors.setMaxAge(600); server.addMiddleware(&cors); // Test CORS preflight request // curl -v -X OPTIONS -H "origin: http://192.168.4.1" http://192.168.4.1/cors // // Test CORS request // curl -v -H "origin: http://192.168.4.1" http://192.168.4.1/cors // // Test non-CORS request // curl -v http://192.168.4.1/cors // server.on("/cors", HTTP_GET, [](AsyncWebServerRequest *request) { request->send(200, "text/plain", "Hello, world!"); }); server.begin(); } // not needed void loop() { delay(100); }