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What is the main difference between the Chain of Responsibility pattern and the Middleware pattern?

No difference at all, they are the same, just different names.

Chain of Responsibility executes all handlers while Middleware may stop when a handler processes the request and does not call the next one.

The Chain of Responsibility pattern always processes requests in parallel, whereas Middleware processes requests sequentially.

Middleware executes all handlers while Chain of Responsibility may stop when a handler processes the request and does not call the next one.