Fix: broken websocket test and proxy-producer error handling - #99
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Nice work, I just have a minor naming suggestion
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What about using PayloadEncodingError?
My thinking is that the payload itself should never be invalid, since we don't care about it.
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sure.. addressed it.
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as doc doesn't have any failure response example: added failure response
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Ok, but keep it in a separate code block, to make it easier to see that they are 2 different json responses.
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**Fixes:** apache#166 apache#153 apache#99 **Issue:** KoP uses [Kafka-2.0.0](https://github.com/streamnative/kop/blob/78d9ba3487d4d7c85a5d667d45d9b38aaa7c824f/pom.xml#L46) which supports [API_VERSION's](https://kafka.apache.org/protocol.html#The_Messages_ApiVersions) **0** --> **2** When **_Kafka-Clients-2.4.x+_**(using `API_VERSION: 3`) connects to KoP, it panics and following error stack is observed: `10:22:23.281 [pulsar-io-22-4] ERROR io.streamnative.pulsar.handlers.kop.KafkaCommandDecoder - error to get Response ByteBuf: java.lang.IllegalArgumentException: Invalid version for API key API_VERSIONS: 3 at org.apache.kafka.common.protocol.ApiKeys.schemaFor(ApiKeys.java:312) ~[?:?] at org.apache.kafka.common.protocol.ApiKeys.responseSchema(ApiKeys.java:286) ~[?:?] at org.apache.kafka.common.requests.ApiVersionsResponse.toStruct(ApiVersionsResponse.java:129) ~[?:?] at org.apache.kafka.common.requests.ResponseUtils.serializeResponse(ResponseUtils.java:40) ~[?:?]` **Resolved By:** Returning an `UNSUPPORTED_VERSION` [error-code: 35](https://kafka.apache.org/protocol.html#protocol_error_codes), which would notify the **_kafka-client_** to lower it's `API_VERSION`. As no list of `ApiKeys & versions` were available for the **kafka-clients** to refer, it safely falls-back to using `API_VERSION: 0` and KoP continues processing the kafka-messages using `API_VERSION: 0`. **Tested producing/consuming with Kafka-Clients:** > 2.0.0 2.2.2 2.3.1 2.4.0 2.4.1 2.5.0 2.5.1 2.6.0 **More...** KoP could have returned the list of supported `ApiKeys & versions` while sending the `UNSUPPORTED_VERSION` error-code, which would have made the **_kafka-client_** select the **_latest_** supported `API_VERSION` and use `API_VERSION: 2` instead of falling all the way back and using `API_VERSION: 0` Notes on how **_Kafka-Brokers_** is supposed to handle this scenario: > 2. On receiving ApiVersionsRequest, a broker returns its full list of supported ApiKeys and versions regardless of current authentication state (e.g., before SASL authentication on an SASL listener, do note that no Kafka protocol requests may take place on an SSL listener before the SSL handshake is finished). If this is considered to leak information about the broker version a workaround is to use SSL with client authentication which is performed at an earlier stage of the connection where the ApiVersionRequest is not available. Also, note that broker versions older than 0.10.0.0 do not support this API and will either ignore the request or close connection in response to the request. > > 3. If multiple versions of an API are supported by broker and client, clients are recommended to use the latest version supported by the broker and itself. _Reference: [Kafka-Protocol Guide](https://kafka.apache.org/protocol.html#api_versions)_ We analyzed how various **_Kafka-Brokers_** respond to a similar situation where the **_kafka-client's_** `API_VERSION` is higher than what is supported by the **_Kafka-Broker_**.  _Reference: Wireshark packet captures - [Kafka-Protocol-Study.zip](https://github.com/streamnative/kop/files/5127018/Kafka-Protocol-Study.zip)_ From the study we can infer that, in a similar `API_VERSION` mismatch scenario the **_Kafka-Brokers_** doesn't return the list of supported `ApiKeys & versions` when notifying the **_kafka-client_** with the `UNSUPPORTED_VERSION` [error-code: 35](https://kafka.apache.org/protocol.html#protocol_error_codes). Thus, forcing the **_kafka-clients_** to fall-back to using `API_VERSION: 0`. To keep KoP working in sync with the **_Kafka-Broker_** working, we decided not to return the list of supported `ApiKeys & versions`.
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