why `copyHeaders` remove dst header key-values first?

[luweimy]

func copyHeaders(dst, src http.Header) {
    for k, _ := range dst {
        dst.Del(k)
    }
    for k, vs := range src {
        for _, v := range vs {
            dst.Add(k, v)
        }
    }
}

I write cookie to response in middleware, but goproxy will remove response headers. What should I do?.

[elazarl]

because one header could have multiple values.

Just calling Add would keep the previous value, and add another value to the header.

On Tue, Nov 21, 2017 at 6:23 AM, luwei notifications@github.com wrote:

func copyHeaders(dst, src http.Header) { for k, := range dst { dst.Del(k) } for k, vs := range src { for , v := range vs { dst.Add(k, v) } } }

I write cookie to response in middleware, but goproxy will remove response harders

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