WebCamServer example will cause "Header fields are too long for server to interpret".

[Hieromon]

WebCamServer example build on espressif32 4.2.0 platform for PlatformIO will causes "Header fields are too long for server to interpret" with Chrome browser.

This is because the value of CONFIG_HTTPD_MAX_REQ_HDR_LEN in the sdkconfig adopted by the arduino-esp32 package imported by PlatformIO is 512. It has already been fixed in idf-release/v4.4 and has changed to 1024. On the other hand, platformio-espressif32 4.2.0 (based on arduino-esp32 2.0.2) has not reflected the fix yet.

And even if you changed the sdkconfig directly to the CONFIG_HTTPD_MAX_REQ_HDR_LEN value to 1024, that would cause a new and different problem. sdkconfig is for esp-idf, and it contains the configuration that the arduino-esp32 core assumes. The platformio-espressif32 arduino framework is still arduino-esp32 2.0.2, so changing CONFIG_HTTPD_MAX_REQ_HDR_LEN=1024 alone cannot be a workaround. In addition, the following workaround applying arduino-esp32 2.0.3 release with platformio.ini may not be sufficient. (Its master is further ahead.)

platform = espressif32 @ 4.2.0
framework = arduino
platform_packages = framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32/releases/download/2.0.3/esp32-2.0.3.zip

I expect that this fix will propably be reflected in the next update turn of platformio-espressif32. Until the fix, if you are building a sketch with PlatformIO that relies on the HTTP Server component of ESP-IDF to handle the camera driver, I would still recommended adopting esp-idf 3.3.5 as your platform.

Related issue: espressif/arduino-esp32#5969