v3.9.3

What's Changed

• Fix compiler warning on Arduino Core 2 by @mathieucarbou in #357
• fix: strlen is not constexpr by @proxict in #354
• Deal with safari fragmented pong data by @DeqingSun in #353

New Contributors

• @proxict made their first contribution in #354
• @DeqingSun made their first contribution in #353

Full Changelog: v3.9.2...v3.9.3

v3.9.2

What's Changed

• Several fixes around Chunk processing (Json) of a large Json document and available length passed to fill send buffer by @mathieucarbou in #349

Full Changelog: v3.9.1...v3.9.2

v3.9.1

⚠️ This release works on ESP8266

What's Changed

• Introduce cpplint check by @mathieucarbou in #334
• Correctly support ESP8266 for examples and default filters by @mathieucarbou in #344
• Support ESP8266 TCP stack config by @willmmiles in #345

Full Changelog: v3.9.0...v3.9.1

v3.9.0

⚠️ This release is broken on ESP8266

• Update November , 25th 2025: Subscribe to this issue to get notified: #343

🏃 Performance improvement

• Huge performance improvement in terms of request served: about 6x faster!
  @vortigont refactored the part sending bytes over the wire. In our benchmark test, we can now serve with 16 concurrent clients about ~ 70 req / second. Before, we were capped at ~12-13 req / second.

• ESP32Async/AsyncTCP @ 3.4.9 by @mathieucarbou in #302 (Switch from rand() to an XOR Shift to favor speed over random quality in ESP32Async/AsyncTCP#89)

💡 New Feature

URIMatcher was added to handler declaration in order to have more flexibility when defining routes, with or without regex support (-D ASYNCWEBSERVER_REGEX=1). This also applies to Json and MessagePack handlers. See the example and doc at https://github.com/ESP32Async/ESPAsyncWebServer/tree/main/examples/URIMatcher

• Introduce AsyncURIMatcher class to encapsulate the URI matching logic with and without regex support (-D ASYNCWEBSERVER_REGEX=1) by @mathieucarbou in #304

• Added URIMatcherTest to test possible route matching by @mathieucarbou in #311

• Completing support for Bearer tokens which were initially half-supported by @mathieucarbou in #309

🐛 Fixes

• Fix #292: Upload handler was not called when an empty file was uploaded. by @mathieucarbou in #293
• Fix CORS behavior when credentials flag is set to true. by @mathieucarbou in #295
• Fix ETag handling for dynamic template responses by @JosePineiro and @willmmiles in #271
• Fix compiler warning by @mathieucarbou in #303
• CONFIG_ESP32_WIFI_ENABLED was missing for Arduino 2 by @mathieucarbou in #314
• Fix multipart file upload handling and improve error responses by @mathieucarbou in #329
• fix: AsyncAbstractResponse might loose part of send buffer by @vortigont and @mathieucarbou in #316

⚙️ Under the hood

• Backward-compatible refactoring of the Json and MessagePack integration . by @mathieucarbou in #301
• Code and CI cleanup in relation to regex support by @mathieucarbou in #310
• Added LargeResponse example by @mathieucarbou in #317
• Update GH Actions to use faster uv and pioarduino core instead pio core by @Jason2866 in #320
• Cleanup close(bool) calls by @mathieucarbou in #321

New Contributors

• @Jason2866 made their first contribution in #320
• @vortigont made their first contribution in #316

Full Changelog: v3.8.1...v3.9.0

v3.8.1

What's Changed

• Refactor _getEtag to get etag from gzip instead of buffer by @JosePineiro in #270
• Improve JS MIME type detection by @JosePineiro in #273
• Fix: Refactor AsyncFileResponse (File overload) by @JosePineiro in #272
• Correctly support form POST with text/plain content type by @mathieucarbou in #280
• Logging refactoring to supports macros redefinition and -D USE_ESP_IDF_LOG by @mathieucarbou in #281
• ESP32Async/AsyncTCP @ 3.4.8 by @mathieucarbou in #285

Full Changelog: v3.8.0...v3.8.1

v3.8.0

What's Changed

• Fix bug. Sometimes the content type isn't sent. by @JosePineiro in #228
• Add HTTP content-type for WebP and AVIF by @JosePineiro in #229
• Standardize HTTP headers to Title Case by @JosePineiro in #233
• Add Content-Type for MP4 files by @JosePineiro in #234
• ESP32Async/AsyncTCP @ 3.4.6 by @mathieucarbou in #250
• Updated pioarduino CI to Arduino Release v3.3.0 based on ESP-IDF v5.5.0 by @mathieucarbou in #251
• ESP32Async/AsyncTCP @ 3.4.7 by @mathieucarbou in #255
• Use const return value with strchr by @kyberias in #257
• Remove unnecessary implementation of memchr by @kyberias in #258
• Refactor AsyncFileResponse: remove String _path by @JosePineiro in #235
• refactor: optimize AsyncFileResponse handling by @JosePineiro in #240
• feature: refactor content type and MIME list by @JosePineiro in #241
• Update sample to add content served from gz file by @mathieucarbou in #263
• Move definition of AsyncWebSocketControl to header file by @kyberias in #264

New Contributors

• @kyberias made their first contribution in #257

Full Changelog: v3.7.10...v3.8.0

v3.7.10

What's Changed

• Fix compile on libretiny due to round macro conflict by @bdraco in #214
• Fixed Header parsing by @mathieucarbou in #215
• Arduino Core 3.2.1 by @mathieucarbou in #217
• ESP32Async/AsyncTCP @ 3.4.5 by @mathieucarbou in #218
• ETag and caching for serving pre‐compressed files by @JosePineiro in #216
• set default value for '_onDisconnectfn' by @lumapu in #221
• Support for pre-compressed and ETag in download by @JosePineiro in #222
• Optimize content type detection using C-strings by @JosePineiro in #225

New Contributors

• @bdraco made their first contribution in #214
• @JosePineiro made their first contribution in #216
• @lumapu made their first contribution in #221

Full Changelog: v3.7.9...v3.7.10

v3.7.9

What's Changed

• bblanchon/ArduinoJson @ 7.4.2 by @mathieucarbou in #206
• Fix CRLF Injection in AsyncWebHeader.cpp (GHSA-87j8-6f7g-h8wh) by @mathieucarbou in #211

Full Changelog: v3.7.8...v3.7.9

v3.7.8

What's Changed

• Fix esp-idf dependencies (closes #161) by @mathieucarbou in #162
• AsyncTCP v3.4.1 by @mathieucarbou in #174
• Tunnel by @mathieucarbou in #171
• ESP32Async/AsyncTCP @ 3.4.2 by @mathieucarbou in #181
• Fix memory cleanup in example by @mathieucarbou in #189
• ESP32Async/AsyncTCP @ 3.4.3 by @mathieucarbou in #196
• fix Invalid JSON desearilaztion beyond buffer end by @ayavilevich in #184
• ESP32Async/AsyncTCP @ 3.4.4 by @mathieucarbou in #197
• Add P4 to build by @mathieucarbou in #201
• Only activate WiFi related code when WiFi is available by @mathieucarbou in #202
• Add LibreTiny support by @kuba2k2 in #187

New Contributors

• @ayavilevich made their first contribution in #184
• @kuba2k2 made their first contribution in #187

Full Changelog: v3.7.7...v3.7.8

v3.7.7

What's Changed

• bblanchon/ArduinoJson @ 7.4.0 by @mathieucarbou in #154
• Fix WebSocket by @TienHuyIoT in #153
• bblanchon/ArduinoJson @ 7.4.1 by @mathieucarbou in #155
• Fix SSE by @TienHuyIoT in #156
• ESP32Async/AsyncTCP @ 3.4.0 by @mathieucarbou in #159

New Contributors

• @TienHuyIoT made their first contribution in #153

Full Changelog: v3.7.6...v3.7.7