}
			defer cleanup()

			mw := &mockTransferWriter{}
			tw := &transferWriter{
				Body:             body,
				ContentLength:    tc.contentLength,
				TransferEncoding: tc.transferEncoding,
			}

			if err := tw.writeBody(mw); err != nil {
				t.Fatal(err)
			}

			if tc.expectedReader != nil {
				if mw.CalledReader == nil {
					t.Fatal("did not call ReadFrom")
				}

				ProtoMajor:       1,
				ProtoMinor:       1,
				Request:          dummyReq11("GET"),
				Header:           Header{},
				Body:             io.NopCloser(strings.NewReader("abcdef")),
				ContentLength:    -1,
				TransferEncoding: []string{"chunked"},
				Close:            false,
			},
			"HTTP/1.1 200 OK\r\n" +
				"Transfer-Encoding: chunked\r\n\r\n" +
				"6\r\nabcdef\r\n0\r\n\r\n",
		},

			host = req.URL.Host
		}
		if host != "" {
			fmt.Fprintf(&b, "Host: %s\r\n", host)
		}
	}

	chunked := len(req.TransferEncoding) > 0 && req.TransferEncoding[0] == "chunked"
	if len(req.TransferEncoding) > 0 {
		fmt.Fprintf(&b, "Transfer-Encoding: %s\r\n", strings.Join(req.TransferEncoding, ","))
	}

	err = req.Header.WriteSubset(&b, reqWriteExcludeHeaderDump)
	if err != nil {
		return nil, err
	}

		}

		// Calculate input body size with headers
		reqHeaders := r.Header.Clone()
		reqHeaders.Set("Host", r.Host)
		if len(r.TransferEncoding) == 0 {
			reqHeaders.Set("Content-Length", strconv.Itoa(int(r.ContentLength)))
		} else {
			reqHeaders.Set("Transfer-Encoding", strings.Join(r.TransferEncoding, ","))
		}
		inputBytes := reqRecorder.Size()
		for k, v := range reqHeaders {
			inputBytes += len(k) + len(v)
		}

			extractedSignedHeaders.Set(header, r.Host)
		case "transfer-encoding":
			// Go http server removes "host" from Request.Header
			extractedSignedHeaders[http.CanonicalHeaderKey(header)] = r.TransferEncoding
		case "content-length":
			// Signature-V4 spec excludes Content-Length from signed headers list for signature calculation.
			// But some clients deviate from this rule. Hence we consider Content-Length for signature