I was trying to adapt one of the http clients (urequests/uaiohttp) to be able to use https

base on the basic example of ussl.warp_socket (and few other examples of people trying it out)
and I was hitting this failure when trying to use Stream.readline(), while it's working o.k. when using a non ssl wrapped socket

I've tested it on the unix micropython, both on 1.19 and 1.18

❯ docker run -it -w /home  -v `pwd`/lib:/root/.micropython/lib -v `pwd`:/home micropython/unix:v1.19 micropython-dev net_example.py
Address infos: [(2, 1, 6, None, bytearray(b'\x02\x00\x01\xbbh\xed\x89\xd3\x00\x00\x00\x00\x00\x00\x00\x00')), (2, 2, 17, None, bytearray(b'\x02\x00\x01\xbbh\xed\x89\xd3\x00\x00\x00\x00\x00\x00\x00\x00')), (2, 3, 0, None, bytearray(b'\x02\x00\x01\xbbh\xed\x89\xd3\x00\x00\x00\x00\x00\x00\x00\x00'))]
Connect address: bytearray(b'\x02\x00\x01\xbbh\xed\x89\xd3\x00\x00\x00\x00\x00\x00\x00\x00')
Traceback (most recent call last):
  File "net_example.py", line 53, in <module>
  File "uasyncio/core.py", line 1, in run_until_complete
  File "uasyncio/core.py", line 1, in run_until_complete
  File "uasyncio/core.py", line 1, in run_until_complete
  File "net_example.py", line 46, in main
  File "uasyncio/stream.py", line 1, in readline
TypeError: unsupported types for __iadd__: 'bytes', 'NoneType'

here's the example that reproduce it:

try:
    import usocket as _socket
except:
    import _socket
try:
    import ussl as ssl
except:
    import ssl

# https://github.com/micropython/micropython/blob/master/examples/network/http_client_ssl.py
# https://freewavesamples.com/files/Ensoniq-ZR-76-08-Dope-92.wav
# http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/Samples/AFsp/M1F1-Alaw-AFsp.wav

import uasyncio as asyncio

from uasyncio.stream import Stream
from uasyncio import core


async def main(https=True):
    s = _socket.socket()

    if https:
        ai = _socket.getaddrinfo("freewavesamples.com", 443)
    else:
        ai = _socket.getaddrinfo("www-mmsp.ece.mcgill.ca", 80)
    print("Address infos:", ai)
    addr = ai[2][-1]

    print("Connect address:", addr)
    s.connect(addr)

    if https:
        s = ssl.wrap_socket(s)
    s.setblocking(False)
    yield core._io_queue.queue_write(s)
    ss = Stream(s)

    if https:
        ss.write(b"GET /files/Ensoniq-ZR-76-08-Dope-92.wav HTTP/1.0\r\nHost: freewavesamples.com\r\n\r\n")
    else:
        ss.write(b"GET /Documents/AudioFormats/WAVE/Samples/AFsp/M1F1-Alaw-AFsp.wav HTTP/1.0\r\nHost: www-mmsp.ece.mcgill.ca\r\n\r\n")

    await ss.drain()
    # print(await ss.read(4096)) # this works both on http/https
    print(await ss.readline()) # readline works only on http
    print(await ss.readline())

    ss.close()


loop = asyncio.get_event_loop()
loop.run_until_complete(main())
loop.close()