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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright 2016-2025 Hristo Gochkov, Mathieu Carbou, Emil Muratov
//
// Make sure resumable downloads can be implemented (HEAD request / response and Range header)
//
#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);
void setup() {
Serial.begin(115200);
#ifndef CONFIG_IDF_TARGET_ESP32H2
WiFi.mode(WIFI_AP);
WiFi.softAP("esp-captive");
#endif
/*
❯ curl -I -X HEAD http://192.168.4.1/download
HTTP/1.1 200 OK
Content-Length: 1024
Content-Type: application/octet-stream
Connection: close
Accept-Ranges: bytes
*/
// Ref: https://github.com/mathieucarbou/ESPAsyncWebServer/pull/80
server.on("/download", HTTP_HEAD | HTTP_GET, [](AsyncWebServerRequest *request) {
if (request->method() == HTTP_HEAD) {
AsyncWebServerResponse *response = request->beginResponse(200, "application/octet-stream");
response->addHeader(asyncsrv::T_Accept_Ranges, "bytes");
response->addHeader(asyncsrv::T_Content_Length, 10);
response->setContentLength(1024); // make sure we can overrides previously set content length
response->addHeader(asyncsrv::T_Content_Type, "foo");
response->setContentType("application/octet-stream"); // make sure we can overrides previously set content type
// ...
request->send(response);
} else {
// ...
}
});
server.begin();
}
void loop() {
delay(100);
}
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