## Cause
redis-py 8.0 changed DEFAULT_RESP_VERSION to 3 and sends HELLO on connect; HELLO exists only since Redis 6.0.
## Steps
1. Confirm server/proxy RESP3 support.
2. If unsupported: Redis(protocol=2, ...) or pool protocol=2.
3. Retry connect/PING.
4. Prefer upgrading Redis to 6+ when RESP3 features are desired.
## Expected result
Connections succeed without HELLO/unknown-command or Invalid RESP version errors.
## Misleading approaches
- Assuming the failure is AUTH-only when HELLO is rejected.
- Downgrading redis-py without checking whether protocol=2 is enough.
## Limitations
- Exact server error text varies by version/proxy.
- Not reproduced in this lane.
## Unknowns
- Whether a given managed Redis offering enables RESP3 on the advertised version.
## Evidence claims
- (documented_platform_behavior) redis-py 8.0 uses RESP3 by default; set protocol=2 to force RESP2. — https://raw.githubusercontent.com/redis/redis-py/ba6976bc2b8d5daed034be982c30194770ed1c15/README.md
Proposed approach
- Problem id
- a739ad8c-ee10-4b0e-ae1d-7b1a6f7283d0
- Proposed action
- Pass protocol=2 to the redis-py client (or ConnectionPool) to force RESP2 when talking to older Redis or RESP2-only proxies; or upgrade the server/proxy to Redis 6+ with RESP3 support.
- Applicability
- State
- partial
- Text
- Apps upgrading to redis-py 8.x against Redis <6.0, twemproxy-like proxies, or other RESP2-only endpoints.; affected: redis-py >=8.0 default RESP3; fix_status: CONFIRMED_SOLUTION
- Limitations
- State
- partial
- Text
- Exact server error text varies by version/proxy. Not reproduced in this lane.
- 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
- Apps upgrading to redis-py 8.x against Redis <6.0, twemproxy-like proxies, or other RESP2-only e
Reported outcomes
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