setContentLength в doFilter игнорируется

Question

У меня есть собственный фильтр, который манипулирует ответом. Каркас фильтра выглядит следующим образом.

Оболочка ответа,

public class CustomResponseWrapper extends HttpServletResponseWrapper {

    private final ByteArrayOutputStream capture;
    private ServletOutputStream output;
    private PrintWriter writer;

    public CustomResponseWrapper(HttpServletResponse response) {
        super(response);
        capture = new ByteArrayOutputStream(response.getBufferSize());
    }

    @Override
    public ServletOutputStream getOutputStream() {
        if (writer != null) {
            throw new IllegalStateException("getWriter() has already been called on this response");
        }

        if (output == null) {
            // To manipulate the response
            output = new ServletOutputStream() {
                @Override
                public void write(int b) throws IOException {
                    capture.write(b);
                }

                @Override
                public void flush() throws IOException {
                    capture.flush();
                }

                @Override
                public void close() throws IOException {
                    capture.close();
                }

                @Override
                public boolean isReady() {
                    return false;
                }

                @Override
                public void setWriteListener(WriteListener arg0) {
                }
            };
        }

        return output;
    }

    @Override
    public PrintWriter getWriter() throws IOException {
        if (output != null) {
            throw new IllegalStateException("getOutputStream() has already been called on this response.");
        }

        if (writer == null) {
            writer = new PrintWriter(new OutputStreamWriter(capture,
                                                            getCharacterEncoding()));
        }

        return writer;
    }

    @Override
    public void flushBuffer() throws IOException {
        super.flushBuffer();

        if (writer != null) {
            writer.flush();
        } else if (output != null) {
            output.flush();
        }
    }

    @Override
    public void setCharacterEncoding(String charset) {
        super.setCharacterEncoding(charset);
    }

    public byte[] getCaptureAsBytes() throws IOException {
        if (writer != null) {
            writer.close();
        } else if (output != null) {
            output.close();
        }

        return capture.toByteArray();
    }

    public String getCaptureAsString() throws IOException {
        return new String(getCaptureAsBytes(), getCharacterEncoding());
    }
}

Фильтр,

public class CustomInjectFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        PrintWriter originalOut = servletResponse.getWriter();
        CustomResponseWrapper responseWrapper = new CustomResponseWrapper((HttpServletResponse) servletResponse);
        filterChain.doFilter(servletRequest, responseWrapper);

        String originalContent = responseWrapper.getCaptureAsString();
        // Do the changes i need to do here
        String jsonData = "....";
        servletResponse.setCharacterEncoding("...");
        servletResponse.setContentType("...");
        servletResponse.setContentLength(jsonData.lenth());
        originalOut.write(jsonData);
        originalOut.flush();
        originalOut.close();
    }
}

setContentLength здесь не имеет никакого эффекта, а вместо этого длина ответапоказывает исходную длину каждый раз.

Есть ли причина, по которой setContentLength и методы set на ответ не влияют в этом случае?