From 85ea4e995a75abe061f6fc375ea0481084dddd43 Mon Sep 17 00:00:00 2001 From: schererleander Date: Tue, 20 Jan 2026 08:34:54 +0100 Subject: initial commit --- .../examples/ChunkResponse/ChunkResponse.ino | 140 +++++++++++++++++++++ 1 file changed, 140 insertions(+) create mode 100644 libraries/ESP_Async_WebServer/examples/ChunkResponse/ChunkResponse.ino (limited to 'libraries/ESP_Async_WebServer/examples/ChunkResponse') diff --git a/libraries/ESP_Async_WebServer/examples/ChunkResponse/ChunkResponse.ino b/libraries/ESP_Async_WebServer/examples/ChunkResponse/ChunkResponse.ino new file mode 100644 index 0000000..e7d4838 --- /dev/null +++ b/libraries/ESP_Async_WebServer/examples/ChunkResponse/ChunkResponse.ino @@ -0,0 +1,140 @@ +// SPDX-License-Identifier: LGPL-3.0-or-later +// Copyright 2016-2025 Hristo Gochkov, Mathieu Carbou, Emil Muratov + +// +// Chunk response with caching example +// + +#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 const char *htmlContent PROGMEM = R"( + + + + Sample HTML + + +

Hello, World!

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin euismod, purus a euismod + rhoncus, urna ipsum cursus massa, eu dictum tellus justo ac justo. Quisque ullamcorper + arcu nec tortor ullamcorper, vel fermentum justo fermentum. Vivamus sed velit ut elit + accumsan congue ut ut enim. Ut eu justo eu lacus varius gravida ut a tellus. Nulla facilisi. + Integer auctor consectetur ultricies. Fusce feugiat, mi sit amet bibendum viverra, orci leo + dapibus elit, id varius sem dui id lacus.

+ + +)"; + +static const size_t htmlContentLength = strlen_P(htmlContent); + +void setup() { + Serial.begin(115200); + +#ifndef CONFIG_IDF_TARGET_ESP32H2 + WiFi.mode(WIFI_AP); + WiFi.softAP("esp-captive"); +#endif + + // first time: serves the file and cache headers + // curl -N -v http://192.168.4.1/ --output - + // + // secodn time: serves 304 + // curl -N -v -H "if-none-match: 4272" http://192.168.4.1/ --output - + // + server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) { + String etag = String(htmlContentLength); + + if (request->header(asyncsrv::T_INM) == etag) { + request->send(304); + return; + } + + AsyncWebServerResponse *response = request->beginChunkedResponse("text/html", [](uint8_t *buffer, size_t maxLen, size_t index) -> size_t { + Serial.printf("%u / %u\n", index, htmlContentLength); + + // finished ? + if (htmlContentLength <= index) { + Serial.println("finished"); + return 0; + } + + // serve a maximum of 256 or maxLen bytes of the remaining content + // this small number is specifically chosen to demonstrate the chunking + // DO NOT USE SUCH SMALL NUMBER IN PRODUCTION + // Reducing the chunk size will increase the response time, thus reducing the server's capacity in processing concurrent requests + const int chunkSize = min((size_t)256, min(maxLen, htmlContentLength - index)); + Serial.printf("sending: %u\n", chunkSize); + + memcpy(buffer, htmlContent + index, chunkSize); + + return chunkSize; + }); + + response->addHeader(asyncsrv::T_Cache_Control, "public,max-age=60"); + response->addHeader(asyncsrv::T_ETag, etag); + + request->send(response); + }); + + server.begin(); +} + +void loop() { + delay(100); +} -- cgit v1.3.1