beginChunkedResponse Lambda expression behaviour

[peterj43]

I am trying download files from our ESP32Dev unit using beginChunkedResponse() as the files we need to transfer are over 5k. The initial work i did used Lib_deps = ... me-no-dev/[email protected]... When I change to use later versions e.g. ESP32Async/[email protected] I find that the lambda expression referenced in beginChunkedResponse() does not execute, yet it does execute when version 1.2.4 is used.
Can anyone give me any guidence as where I may be going wrong.

Regards
Peter

Processing debug_soil_monitor (platform: espressif32; board: esp32devdln1v14; framework: arduino, espidf)

Library Manager: Installing me-no-dev/ESPAsyncWebServer @ 1.2.4
Unpacking 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Library Manager: ESP Async [email protected] has been installed!
Library Manager: Resolving dependencies...
Verbose mode can be enabled via -v, --verbose option
CONFIGURATION: https://docs.platformio.org/page/boards/espressif32/esp32devdln1v14.html
PLATFORM: Espressif 32 (6.10.0) > DLN Sensor2Sat Module
HARDWARE: ESP32 240MHz, 520KB RAM, 16MB Flash
DEBUG: Current (cmsis-dap) External (cmsis-dap, esp-bridge, esp-prog, iot-bus-jtag, jlink, minimodule, olimex-arm-usb-ocd, olimex-arm-usb-ocd-h, olimex-arm-usb-tiny-h, olimex-jtag-tiny, tumpa)
PACKAGES:

• framework-arduinoespressif32 @ 3.20017.241212+sha.dcc1105b
• framework-espidf @ 3.40407.240606 (4.4.7)
• tool-cmake @ 3.16.4
• tool-esptoolpy @ 1.40501.0 (4.5.1)
• tool-mkfatfs @ 2.0.1
• tool-mklittlefs @ 1.203.210628 (2.3)
• tool-mkspiffs @ 2.230.0 (2.30)
• tool-ninja @ 1.9.0
• toolchain-esp32ulp @ 1.23800.240113 (2.38.0)
• toolchain-xtensa-esp32 @ 8.4.0+2021r2-patch5
  Warning! Arduino framework as an ESP-IDF component doesn't handle the variant field! The default esp32 variant will be used.
  Reading CMake configuration...
  Library Manager: Installing me-no-dev/ESPAsyncWebServer @ 1.2.4
  Unpacking 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
  Library Manager: ESP Async [email protected] has been installed!
  Library Manager: Resolving dependencies...
  Library Manager: Installing Hash
  LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
  LDF Modes: Finder ~ chain, Compatibility ~ strict
  Library Manager: Installing me-no-dev/ESPAsyncWebServer @ 1.2.4
  Unpacking 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
  Library Manager: ESP Async [email protected] has been installed!
  Library Manager: Resolving dependencies...
  Library Manager: Installing Hash
  Found 44 compatible libraries
  Scanning dependencies...
  Dependency Graph
  |-- FDC1004 @ 0.0.0+20250321161441
  |-- SparkFun u-blox GNSS Arduino Library @ 2.2.22
  |-- ADS1X15 @ 0.3.10
  |-- Time @ 0.0.0+20250321161441
  |-- DLN - Accelerometer(BMA456) @ 1.0.0
  |-- ArduinoNvs @ 2.10.0
  |-- SHA-1 Hash @ 1.1.0
  |-- WiFiManager @ 2.0.17+sha.b67b782
  |-- src
  |-- WebServer @ 2.0.0
  |-- WiFi @ 2.0.0
  |-- Wire @ 2.0.0
  |-- FS @ 2.0.0
  |-- LittleFS @ 2.0.0
  |-- AsyncTCP @ 1.1.1
  |-- DNSServer @ 2.0.0
  |-- ESP Async WebServer @ 1.2.4
  |-- Update @ 2.0.0

[vortigont]

you should not use chunked response for files download, AWServers can handle files download quite effectively with static handler, from what we tested downloading >10MiB files from SDCARD works pretty well.

[mathieucarbou]

Hello,
Please have a look at the many examples in the project also ;-)