Can’t quite understand why the idempotency key isn’t working for PATCH requests to conversations/calls/{id}/participants/{id}.
I’ve built a wrapper that generates a unique UUID for every attribute update. The logic sends this UUID in the Idempotency-Key header. First call works fine. Second call with same key returns 200 but doesn’t update. Third call returns 409 Conflict.
headers = {
'Content-Type': 'application/json',
'Idempotency-Key': str(uuid.uuid4())
}
resp = session.patch(url, json=payload, headers=headers)
The payload is simple:
{
"attributes": {
"queue-name": "support-tier-2"
}
}
Environment:
- Python 3.11
- Genesys Cloud SDK wrapper (custom)
- API endpoint:
/api/v2/conversations/calls/{id}/participants/{id}
Docs say idempotency keys should be cached for 24 hours. I’m hitting the same endpoint within milliseconds. The 409 suggests the server thinks it’s a duplicate but the state isn’t changing. Is the key scoped to the specific participant ID or the conversation? Also, does the attributes object need to be immutable for the cache to work? I’m seeing weird behavior where adding a new attribute key breaks the cache entirely. No idea if it’s a client bug or API quirk. Checking the response headers now but nothing obvious.
Check your Idempotency-Key header handling in the mock server. The Genesys Cloud API usually treats these keys as short-lived (often 15-30 mins), but your local harness might be keeping them in memory indefinitely or caching the response incorrectly. if you’re using a simple in-store map for the mock, ensure the TTL is respected. also, verify that the payload hash matches exactly. even a whitespace difference in the JSON body can cause the 409 if the mock is comparing full request signatures instead of just the key.
here’s a quick node snippet for a mock express route that handles this correctly:
const idempotencyStore = new Map(); // key: uuid, value: { status, body, timestamp }
app.patch('/api/v2/conversations/calls/:id/participants/:pid', (req, res) => {
const key = req.headers['idempotency-key'];
if (key && idempotencyStore.has(key)) {
const cached = idempotencyStore.get(key);
// simple ttl check (15 mins)
if (Date.now() - cached.timestamp > 900000) {
idempotencyStore.delete(key);
} else {
return res.status(cached.status).json(cached.body);
}
}
// process request...
// store result
idempotencyStore.set(key, { status: 200, body: result, timestamp: Date.now() });
res.status(200).json(result);
});
also, make sure you aren’t sending the same key with different payloads. that’s a hard fail in GC.
The best way to fix this is to stop treating the Idempotency-Key as a simple cache key and start treating it like a distributed lock with strict TTLs. is spot on about the payload hash mismatch, but the real culprit in async python apps is usually how you’re managing the state between the httpx client and whatever store you’re using for the mock or proxy layer.
If you’re using Redis (which you should be for any serious proxy), make sure you’re setting an explicit expiration. Genesys Cloud’s idempotency window is roughly 24 hours for most endpoints, but mocks often default to shorter windows or infinite persistence depending on config. Here’s how i handle it in my FastAPI middleware using httpx and aioredis:
import httpx
import aioredis
import json
import hashlib
async def patch_with_idempotency(redis: aioredis.Redis, url: str, payload: dict, id_key: str):
# 1. Check if we've seen this key recently
cached_resp = await redis.get(f"idem:{id_key}")
if cached_resp:
return json.loads(cached_resp) # Return cached result immediately
# 2. Hash the payload to ensure exact match requirement
payload_hash = hashlib.sha256(json.dumps(payload, sort_keys=True).encode()).hexdigest()
async with httpx.AsyncClient() as client:
headers = {
"Content-Type": "application/json",
"Idempotency-Key": id_key,
"X-Payload-Hash": payload_hash # Custom header for your internal validation
}
response = await client.patch(url, json=payload, headers=headers)
# 3. Store result with 24h TTL (86400 seconds)
await redis.setex(f"idem:{id_key}", 86400, json.dumps(response.json()))
return response.json()
The 409 likely hits because your mock server is seeing the same key but a different payload hash (maybe floating point precision issues in the JSON serialization?). Also, check if you’re accidentally reusing the UUID across different endpoint paths. The key is unique to the specific resource URI.
see the docs here for more on idempotency constraints: https://developer.genesys.cloud/apidocs/conversations/calls/parts