Do we have equivalent to http.Header.Add?

[vishr]

I am not able to find a function equivalent to http.Header#Add(key, val string), do we have one?

[valyala]

There is ResponseHeader.Set. But it cannot add multiple headers with the same name.
There are plans for adding http.Header#Add() equivalent to fasthttp later.

[valyala]

Added ResponseHeader.Add and RequestHeader.Add for setting multiple headers under the same key.