The webhook adapter enforced max_body_bytes only via the Content-Length
header; a Transfer-Encoding: chunked request (content_length=None) or a
spoofed small Content-Length bypassed the cap entirely and read the full
body (bounded only by aiohttp's implicit 1 MiB default, above any
operator-configured smaller limit).
- web.Application(client_max_size=max_body_bytes): aiohttp enforces the
cap on every read path, chunked included
- catch HTTPRequestEntityTooLarge -> 413 (was swallowed into generic 400)
- post-read length re-check as defense in depth
- chunked-upload regression test
Manual port of PR #3955 by @Gutslabs onto current main (handler had
been restructured since); authorship preserved.
Gutslabs
ec29590a0f