adambagniewski commented on issue #26185:
URL: https://github.com/apache/pulsar/issues/26185#issuecomment-4959805202
A few additional findings from our investigation that help narrow this down
and confirm the root cause is broker-side (not the NAR):
**1. Excluding Jackson from the interceptor NAR does NOT help.**
We rebuilt our interceptor NAR with `jackson-databind`, `jackson-core` and
`jackson-annotations` excluded from the bundle (so the interceptor uses the
broker-provided Jackson only). The 400 still reproduces identically. This rules
out the "NAR ships a conflicting Jackson" hypothesis and points squarely at the
broker-side `PreInterceptFilter` / `RequestWrapper` body handling.
**2. Deterministic isolation on a live broker (interceptor on vs off).**
Same broker, same request, single variable flipped:
- `brokerInterceptors=[pulsar-interceptor]` → admin POST/PUT returns **HTTP
400** `FAIL_ON_TRAILING_TOKENS`
- `brokerInterceptors=[]` (broker recreated) → same request returns **204**
So the filter chain installed when *any* interceptor is present is both
necessary and sufficient to trigger it — consistent with `PreInterceptFilter`
being registered unconditionally on `getBrokerInterceptor() != null` in
`WebService`.
**3. Not specific to one endpoint — every admin POST/PUT with a JSON body
fails.**
Reproduced on multiple endpoints, all with the same
`FAIL_ON_TRAILING_TOKENS` error, only differing by the bound type:
- `POST .../namespaces/{tenant}/{ns}/retention` → `RetentionPolicies`
- `PUT .../namespaces/{tenant}/{ns}` → `Policies`
- `POST .../bookies/racks-info/{bookie}?group=...` → `BookieInfo`
GET requests (no body) are unaffected. This confirms it's the buffered
request-body replay in `RequestWrapper`, independent of the specific resource.
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