Phân biệt các loại exchange trong rabbitMQ

direct: Là loại exchange mà khi bạn đẩy 1 event kèm 1 routing-key thì event này sẽ được khớp chính xác với routing-key tương ứng queue

fanout: Là loại exchange mà nó sẽ đẩy event vào bất kì cái queue nào đang nhận routing từ exchange đó

topic: Là loại exchange mà nó sẽ đẩy event vào bất kì cái queue nào mà có routing key matched theo các quy ước ký tự (*, #) 

header:  exchanges are similar to Topic exchanges, except instead of pattern matching on the routing key, they use the message header attributes for matching

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