A chunked body of exactly MaxResponseSize bytes is refused with
ErrResponseTooLarge; this test fails until the fix. The upstream sends
the end of the chunked body only after the test has read that many
bytes, so the read that finds the limit used up comes first. A body
sent with a Content-Length, and a body one byte over the limit under
either framing, already behave as intended.
Model: opus-5-5
sneak
d0ad670628