}
	}))

	backURL, err := url.Parse(backend.ts.URL)
	if err != nil {
		t.Fatal(err)
	}
	rp := httputil.NewSingleHostReverseProxy(backURL)
	rp.Transport = backend.tr
	proxy := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
		rp.ServeHTTP(w, r)
	}))

	bodyRes := make(chan any, 1) // error or hash.Hash
	pr, pw := io.Pipe()

000000e0  f0 48 cd 85 61 a3 d2 d1  eb ba 04 39 6b 5e 5f fc  |.H..a......9k^_.|
000000f0  e3 90 c1 cb 3f 40 30 00  5c 94 df bf 5b 89 6d ab  |....?@0.\...[.m.|
00000100  15 1e 72 50 ac 56 ee 16  7d 84 4c e6 0c 89 68 fa  |..rP.V..}.L...h.|
00000110  d5 8d 5f 09 85 25 5f 8c  70 df 0b b7 94 15 40 20  |.._..%_.p.....@ |
00000120  b1 ff 41 50 5d 9f c6 8a  9b 7f 40 6f dc bd 4f 54  |..AP]******@****.***|

			switch c := id[0]; c {
			case '$':
				codes := map[string]byte{
					"SP": '@',
					"BP": '*',
					"RF": '&',
					"LT": '<',
					"GT": '>',
					"LP": '(',
					"RP": ')',
				}

				valid := true
				if len(id) > 2 && id[1] == 'C' && id[2] == '$' {
					sb.WriteByte(',')
					id = id[3:]
				} else if len(id) > 4 && id[1] == 'u' && id[4] == '$' {