为什么http处理程序的参数似乎将其指针向后移动？ [重复]

Question

This question already has an answer here:

• In Go HTTP handlers, why is the ResponseWriter a value but the Request a pointer? 5 answers

I am new to go and still trying to figure out a few things.

func handler(w http.ResponseWriter, r *http.Request) {
}

Why is w not a pointer and on the other hand r is, since the handler function will end up writing into w and only read from r?

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Answer 1

This question has already been answered in this post, but to keep it short.

w http.ResponseWriter is actually an interface that's backed by a non-exported pointer.

Whereas r *http.Request is an actual exposed struct.

I'd recommend following the above link to learn more why this is.