Disable ASYNCWEBSERVER_USE_CHUNK_INFLIGHT by default and updated doc

Author: mathieucarbou

.github/workflows/ci.yml

@@ -109,7 +109,7 @@ jobs:
           - env: ci-arduino-3-no-json
             board: esp32dev
 
-          - env: ci-arduino-3-no-chunk-inflight
+          - env: ci-arduino-3-chunk-inflight
             board: esp32dev
 
           - env: ci-esp8266

README.md

@@ -208,6 +208,8 @@ I personally use the following configuration in my projects:
   -D CONFIG_ASYNC_TCP_STACK_SIZE=4096     // reduce the stack size (default is 16K)
 ```
 
+If you need to server long / slow requests using chunk encoding (like fiel download from SD Card), you might need to set `-D ASYNCWEBSERVER_USE_CHUNK_INFLIGHT=1`.
+
 ## `AsyncWebSocketMessageBuffer` and `makeBuffer()`
 
 The fork from [yubox-node-org](https://github.com/yubox-node-org/ESPAsyncWebServer) introduces some breaking API changes compared to the original library, especially regarding the use of `std::shared_ptr<std::vector<uint8_t>>` for WebSocket.

platformio.ini

@@ -50,9 +50,9 @@ lib_deps =
 ; board = esp32-s3-devkitc-1
 ; board = esp32-c6-devkitc-1
 
-[env:arduino-3-no-chunk-inflight]
+[env:arduino-3-chunk-inflight]
 build_flags = ${env.build_flags}
-  -D ASYNCWEBSERVER_USE_CHUNK_INFLIGHT=0
+  -D ASYNCWEBSERVER_USE_CHUNK_INFLIGHT=1
 
 [env:perf-test-AsyncTCP]
 build_flags = ${env.build_flags}
@@ -98,10 +98,10 @@ board = ${sysenv.PIO_BOARD}
 lib_deps = 
   ESP32Async/AsyncTCP @ 3.3.2
 
-[env:ci-arduino-3-no-chunk-inflight]
+[env:ci-arduino-3-chunk-inflight]
 board = ${sysenv.PIO_BOARD}
 build_flags = ${env.build_flags}
-  -D ASYNCWEBSERVER_USE_CHUNK_INFLIGHT=0
+  -D ASYNCWEBSERVER_USE_CHUNK_INFLIGHT=1
 
 [env:ci-esp8266]
 platform = espressif8266

src/ESPAsyncWebServer.h

@@ -63,7 +63,7 @@
 // See https://github.com/ESP32Async/ESPAsyncWebServer/commit/3d3456e9e81502a477f6498c44d0691499dda8f9#diff-646b25b11691c11dce25529e3abce843f0ba4bd07ab75ec9eee7e72b06dbf13fR388-R392
 // This setting slowdown chunk serving but avoids crashing or deadlocks in the case where slow chunk responses are created, like file serving form SD Card
 #ifndef ASYNCWEBSERVER_USE_CHUNK_INFLIGHT
-  #define ASYNCWEBSERVER_USE_CHUNK_INFLIGHT 1
+  #define ASYNCWEBSERVER_USE_CHUNK_INFLIGHT 0
 #endif
 
 class AsyncWebServer;