assertTrue(e.getMessage().contains("http://example.com/error"));
            assertNotNull(e.getCause());
        }
    }

    public void test_createResponseBodyFile_binaryContent() throws Exception {
        // Test with binary content
        byte[] binaryData = new byte[] { 0x00, 0x01, 0x02, (byte) 0xFF, (byte) 0xFE, (byte) 0xFD };