slack_bolt builds a fresh AsyncWebClient for every inbound request and
copies proxy=app.client.proxy into its constructor, where slack_sdk reads
a None/blank proxy *argument* as "unspecified" and reloads HTTP(S)_PROXY
from the environment. aiohttp then treats that env value as an explicit
proxy and skips its own NO_PROXY check, so the adapter's resolved decision
to go direct - a NO_PROXY bypass, or a proxy scheme aiohttp cannot use -
holds on every client except the one authorization spends on auth.test.
The failure looks like a healthy bot: Socket Mode connects, outbound sends
keep working, and every inbound event is rejected with "Failed to authorize
with the given token" - forever, since a failed auth_test_result is not
cached and never retried differently.
Re-apply the resolved proxy through AsyncApp(before_authorize=...), which
bolt inserts before the authorization middleware: the request-scoped client
already exists there and has not been used yet. Assigning the attribute
post-construction is the only way to express "no proxy" to slack_sdk.
Co-authored-by: Junie <junie@jetbrains.com>
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