go-http-handlerfunc

http.HandlerFunc in Go

tags: learning go programming

content

Go’s http.HandlerFunc type:

go-function-type-method#go-handler-func-type

• to use HandlerFunc, we could have:

MyFunc := func(w http.ResponseWriter, r *http.Request) {
	// do something here
}

• now MyFunc is just a normal ass function, it doesn’t have a specific type
• because MyFunc satisfies func(ResponseWrite, *Request), we can literally convert it to type HandlerFunc

MyHandlerFunc := http.HandlerFunc(MyFunc)

• this is NOT complicated, it’s just like any other type conversion!
  • literally we have:

type MyInt int
normalInt := 1
myInt := MyInt(normalInt)

Note

what http.HandlerFunc is actually doing:

• in essence, it’s a type, whose underlying value is a function, with specific signature.
• we can do type conversion via newFunc := http.HandlerFunc(oldFunc).
• by doing this type conversion, newFunc now has http.Handler interface
• newFunc can now be used as a handler for http server

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• go-http-handler
• go-function-type-method

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