cbornet opened a new pull request #3058: Add pull-mode on Websockets URL: https://github.com/apache/pulsar/pull/3058 Fix #3052 ### Motivation Pull-mode gives more control on WebSocket for back-pressure than basing on consumer acks. ### Modifications Added a query param `pullMode` that if set to true will listen to `permit` type consumer commands that indicate a `permitMessages` number of messages to be sent by the proxy. The change is backward compatible with the current API: * `pullMode` is false by default * if no `type` is sent in the `ConsumerCommand`, it assumes the message is a consumer ack. ### Result ``` wscat -c "http://localhost:8080/ws/v2/consumer/persistent/public/default/my-topic/my-subscription?receiverQueueSize=0&pullMode=true"; connected (press CTRL+C to quit) > {"type": "permit", "permitMessages": 1} < {"messageId":"CMgTEAA=","payload":"SGVsbG8tMA==","properties":{},"publishTime":"2018-11-26T14:22:59.817+01:00"} > {"type": "permit", "permitMessages": 2} < {"messageId":"CMgTEAE=","payload":"SGVsbG8tMQ==","properties":{},"publishTime":"2018-11-26T14:22:59.84+01:00"} < {"messageId":"CMgTEAI=","payload":"SGVsbG8tMg==","properties":{},"publishTime":"2018-11-26T14:22:59.844+01:00"} ```
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