func net/http.cloneOrMakeHeader

3 uses

	net/http (current package)
		client.go#L255: 		req.Header = cloneOrMakeHeader(ireq.Header)
		client.go#L764: 		ireqhdr  = cloneOrMakeHeader(ireq.Header)
		clone.go#L115: func cloneOrMakeHeader(hdr Header) Header {