- name: n2
	    list:
	    - "vv1"
	    - vv2=foo

values and list entries can be added, modified or deleted.

# MODIFY

1. set v1 to v1new

	path: a.b.[name:n1].value
	value: v1new

2. set vv1 to vv3

	// Note the lack of quotes around vv1 (see NOTES below).
	path: a.b.[name:n2].list.[vv1]
	value: vv3

3. set vv2=foo to vv2=bar (using regex match)

	path: a.b.[name:n2].list.[vv2]

	}
	if f.File != nil {
		m := make(map[string][]*multipart.FileHeader)
		for k, vv := range f.File {
			vv2 := make([]*multipart.FileHeader, len(vv))
			for i, v := range vv {
				vv2[i] = cloneMultipartFileHeader(v)
			}
			m[k] = vv2
		}
		f2.File = m
	}
	return f2
}

// cloneMultipartFileHeader should be an internal detail,

					// Ignore since forbidden by RFC 7230, section 4.1.2.
					continue
				}
				vv, ok := rw.HeaderMap[k]
				if !ok {
					continue
				}
				vv2 := make([]string, len(vv))
				copy(vv2, vv)
				res.Trailer[k] = vv2
			}
		}
	}
	for k, vv := range rw.HeaderMap {
		if !strings.HasPrefix(k, http.TrailerPrefix) {
			continue
		}
		if res.Trailer == nil {

		rws.snapHeader = http2cloneHeader(rws.handlerHeader)
	}
}

func http2cloneHeader(h Header) Header {
	h2 := make(Header, len(h))
	for k, vv := range h {
		vv2 := make([]string, len(vv))
		copy(vv2, vv)
		h2[k] = vv2
	}
	return h2
}

// The Life Of A Write is like this:
//
// * Handler calls w.Write or w.WriteString ->
// * -> rws.bw (*bufio.Writer) ->