}
		if testCase.copySourceRange != "" {
			if testCase.copySourceRange == "empty" {
				req.Header.Set("X-Amz-Copy-Source-Range", "") // specifically test for S3 errors in this scenario.
			} else {
				req.Header.Set("X-Amz-Copy-Source-Range", testCase.copySourceRange)
			}
		}

		// Since `apiRouter` satisfies `http.Handler` it has a ServeHTTP to execute the logic of the handler.