This one only manifests on Feather RP2040. It doesn't happen on PyPortal or FeatherS2. Some primitive behaves different? A timing quirk? Flash issue? Other??

This URL comes back as a chunked response, but loads fine:
https://anecdata.dev/ada/chunked2/?oc=8&ic=4&tr=28&ot=0&it=0

But this one hangs up on receiving:
https://anecdata.dev/ada/chunked2/?oc=7&ic=3&tr=17&ot=0&it=0

The parameters affect the data size. My only intuition is that round numbers seem to be fine, but less-round (odd?) numbers fail. The failures manifest as hanging on receive in line 122 of Requests:

Fetching text from https://anecdata.dev/ada/chunked2/?oc=7&ic=3&tr=17&ot=0&it=0
----------------------------------------
Traceback (most recent call last):
  File "code.py", line 34, in <module>
  File "adafruit_requests.py", line 326, in text
  File "adafruit_requests.py", line 315, in content
  File "adafruit_requests.py", line 369, in iter_content
  File "adafruit_requests.py", line 257, in close
  File "adafruit_requests.py", line 245, in _throw_away
  File "adafruit_requests.py", line 122, in _recv_into
  File "adafruit_esp32spi/adafruit_esp32spi_socket.py", line 132, in recv
  File "adafruit_esp32spi/adafruit_esp32spi_socket.py", line 172, in available
  File "adafruit_esp32spi/adafruit_esp32spi.py", line 731, in socket_available
  File "adafruit_esp32spi/adafruit_esp32spi.py", line 325, in _send_command_get_response
  File "adafruit_esp32spi/adafruit_esp32spi.py", line 281, in _wait_response_cmd
  File "adafruit_esp32spi/adafruit_esp32spi.py", line 188, in _wait_for_ready
KeyboardInterrupt: 

(^c after a minute of waiting)

or in reading the chunks, as in:

Traceback (most recent call last):
  File "code.py", line 32, in <module>
  File "adafruit_requests.py", line 326, in text
  File "adafruit_requests.py", line 315, in content
  File "adafruit_requests.py", line 361, in iter_content
  File "adafruit_requests.py", line 220, in _readinto
ValueError: invalid syntax for integer with base 16

In my 'prodution' code, it's always the latter situation. I haven't been able to run Feather RP2040 + Airlift from the beginning.

I doubt it's an Apache issue since it returns fine in the browser and with curl --http1.1. Old Requests was HTTP/1.0, chunked responses are a fact of life with HTTP/1.1.

I've tried this on various versions since the board became available, most recently with Adafruit CircuitPython 6.2.0-beta.4 on 2021-03-18; Adafruit Feather RP2040 with rp2040 and Adafruit CircuitPython 6.2.0-beta.3-142-ga5c675932 on 2021-03-12; Adafruit Feather RP2040 with rp2040 (the slower flash version from adafruit/circuitpython#4392 )

I've spend a lot of time print-debugging this and I'm baffled. By the way, this Feather (I only have one) still has the disappearing-on-reset issue, even with the slower flash version UF2. But large file copies that were a problem before are no longer a problem in the slower flash version or in beta.4. So this could be some weird flash issue, though I've seen no other issues since the slower flash commit.