code: public MockResponse setChunkedBody(String body, int maxChunkSize) {
          try {
              return setChunkedBody(body.getBytes("UTF-8"), maxChunkSize);
          } catch (UnsupportedEncodingException e) {
              throw new AssertionError();
          }
      }
docs: Sets the response body to the UTF-8 encoded bytes of {@code body},
  chunked every {@code maxChunkSize} bytes.