req.Header.Set("authorization", req.Header.Get("authorization")+"a")
					// Setting an invalid Content-MD5 to force a Md5 Mismatch error.
					// Used in tesr case 7.
				case BadMD5:
					req.Header.Set("Content-MD5", "badmd5")
				}

				// invoke the PutObjectPart HTTP handler.
				apiRouter.ServeHTTP(rec, req)

				// validate the error response.
				want := getAPIError(test.expectedAPIError)