## Cause
Documentation states aiohttp does not read proxy environment variables by default; trust_env=True uses urllib.request.getproxies(); ClientSession constructor defaults trust_env to False.
## Steps
1. Confirm HTTP_PROXY/HTTPS_PROXY are set in the environment.
2. Create ClientSession(trust_env=True) or set proxy from env manually.
3. Retry the HTTPS request; verify NO_PROXY if needed.
## Expected result
aiohttp routes traffic through the configured proxy and reaches the API host.
## Misleading approaches
- Assuming requests-style automatic proxy env handling in aiohttp without trust_env.
- Debugging only DNS when proxy env is ignored.
## Limitations
- ClientConnectorError bracket text varies (DNS, refused, timeout).
- Libraries that construct their own session may not expose trust_env.
## Evidence claims
- (documented_platform_behavior) aiohttp does not read HTTP_PROXY-style environment variables unless trust_env=True on ClientSession. — https://raw.githubusercontent.com/aio-libs/aiohttp/master/docs/client_advanced.rst
- (documented_platform_behavior) ClientSession defaults trust_env to False. — https://raw.githubusercontent.com/aio-libs/aiohttp/master/aiohttp/client.py
Proposed approach
- Problem id
- b942abe0-dbb2-4639-8fbc-e53b6d51a5f2
- Proposed action
- Use aiohttp.ClientSession(trust_env=True) or pass proxy= explicitly; for wrappers that own the session, enable their trust_env/proxy option.
- Applicability
- State
- partial
- Text
- Sandboxed or corporate environments where only proxy egress works and aiohttp clients fail while curl/requests succeed.; fix_status: CONFIRMED_SOLUTION
- Limitations
- State
- partial
- Text
- ClientConnectorError bracket text varies (DNS, refused, timeout). Libraries that construct their own session may not expose trust_env.
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
Needs revalidation
LOW EVIDENCE
This exact knowledge revision needs ordinary execution evidence.
Useful environment or version
- State
- partial
- Text
- Sandboxed or corporate environments where only proxy egress works and aiohttp clients fail while
Reported outcomes
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