src/main/java/org/apache/sling/servlets/post/HtmlResponse.java [47:175]:
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    private static final String PN_CHANGE_LOG = "changeLog";

    /**
     * name of the html template
     */
    private static final String TEMPLATE_NAME = "HtmlResponse.html";

    /**
     * name of the html safe referer template
     */
    private static final String NO_GO_BACK_TEMPLATE_NAME = "HtmlNoGoBackResponse.html";

    /**
     * list of changes
     */
    private final StringBuilder changes = new StringBuilder();

    /**
     * Records a generic change of the given <code>type</code>.
     * <p>
     * The change is added to the internal list of changes with the syntax of a
     * method call, where the <code>type</code> is the method name and the
     * <code>arguments</code> are the string arguments to the method enclosed in
     * double quotes. For example, the the call
     *
     * <pre>
     * onChange(&quot;sameple&quot;, &quot;arg1&quot;, &quot;arg2&quot;);
     * </pre>
     *
     * is aded as
     *
     * <pre>
     * sample(&quot;arg1&quot;, &quot;arg2&quot;)
     * </pre>
     *
     * to the internal list of changes.
     *
     * @param type The type of the modification
     * @param arguments The arguments to the modifications
     */
    public void onChange(String type, String... arguments) {
        changes.append(type);
        String delim = "(";
        for (String a : arguments) {
            changes.append(delim);
            changes.append('\"');
            changes.append(a);
            changes.append('\"');
            delim = ", ";
        }
        changes.append(");<br/>");
    }

    // ---------- Response Generation ------------------------------------------

    /**
     * Writes the response to the given writer and replaces all ${var} patterns
     * by the value of the respective property. if the property is not defined
     * the pattern is not modified.
     *
     * @param response to send to
     * @throws IOException if an i/o exception occurs
     */
    @Override
    protected void doSend(HttpServletResponse response) throws IOException {

        response.setContentType("text/html");
        response.setCharacterEncoding("UTF-8");

        // get changelog
        changes.insert(0, "<pre>");
        changes.append("</pre>");
        if (getError() == null) {
            setProperty(PN_CHANGE_LOG, changes.toString());
        } else {
            setProperty(PN_CHANGE_LOG, "");
        }

        Writer out = response.getWriter();

        String templateName;
        if (isSafeReferer()) {
            templateName = TEMPLATE_NAME;
        } else {
            templateName = NO_GO_BACK_TEMPLATE_NAME;
        }

        InputStream template = getClass().getResourceAsStream(templateName);
        Reader in = new BufferedReader(new InputStreamReader(template));
        StringBuilder varBuffer = new StringBuilder();
        int state = 0;
        int read;
        while ((read = in.read()) >= 0) {
            char c = (char) read;
            switch (state) {
                    // initial
                case 0:
                    if (c == '$') {
                        state = 1;
                    } else {
                        out.write(c);
                    }
                    break;
                    // $ read
                case 1:
                    if (c == '{') {
                        state = 2;
                    } else {
                        state = 0;
                        out.write('$');
                        out.write(c);
                    }
                    break;
                    // { read
                case 2:
                    if (c == '}') {
                        state = 0;
                        Object prop = getProperty(varBuffer.toString());
                        if (prop != null) {
                            out.write(ResponseUtil.escapeXml(prop.toString()));
                        }
                        varBuffer.setLength(0);
                    } else {
                        varBuffer.append(c);
                    }
            }
        }
        in.close();
        out.flush();
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src/main/java/org/apache/sling/servlets/post/JakartaHtmlResponse.java [45:173]:
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    private static final String PN_CHANGE_LOG = "changeLog";

    /**
     * name of the html template
     */
    private static final String TEMPLATE_NAME = "HtmlResponse.html";

    /**
     * name of the html safe referer template
     */
    private static final String NO_GO_BACK_TEMPLATE_NAME = "HtmlNoGoBackResponse.html";

    /**
     * list of changes
     */
    private final StringBuilder changes = new StringBuilder();

    /**
     * Records a generic change of the given <code>type</code>.
     * <p>
     * The change is added to the internal list of changes with the syntax of a
     * method call, where the <code>type</code> is the method name and the
     * <code>arguments</code> are the string arguments to the method enclosed in
     * double quotes. For example, the the call
     *
     * <pre>
     * onChange(&quot;sameple&quot;, &quot;arg1&quot;, &quot;arg2&quot;);
     * </pre>
     *
     * is aded as
     *
     * <pre>
     * sample(&quot;arg1&quot;, &quot;arg2&quot;)
     * </pre>
     *
     * to the internal list of changes.
     *
     * @param type The type of the modification
     * @param arguments The arguments to the modifications
     */
    public void onChange(String type, String... arguments) {
        changes.append(type);
        String delim = "(";
        for (String a : arguments) {
            changes.append(delim);
            changes.append('\"');
            changes.append(a);
            changes.append('\"');
            delim = ", ";
        }
        changes.append(");<br/>");
    }

    // ---------- Response Generation ------------------------------------------

    /**
     * Writes the response to the given writer and replaces all ${var} patterns
     * by the value of the respective property. if the property is not defined
     * the pattern is not modified.
     *
     * @param response to send to
     * @throws IOException if an i/o exception occurs
     */
    @Override
    protected void doSend(HttpServletResponse response) throws IOException {

        response.setContentType("text/html");
        response.setCharacterEncoding("UTF-8");

        // get changelog
        changes.insert(0, "<pre>");
        changes.append("</pre>");
        if (getError() == null) {
            setProperty(PN_CHANGE_LOG, changes.toString());
        } else {
            setProperty(PN_CHANGE_LOG, "");
        }

        Writer out = response.getWriter();

        String templateName;
        if (isSafeReferer()) {
            templateName = TEMPLATE_NAME;
        } else {
            templateName = NO_GO_BACK_TEMPLATE_NAME;
        }

        InputStream template = getClass().getResourceAsStream(templateName);
        Reader in = new BufferedReader(new InputStreamReader(template));
        StringBuilder varBuffer = new StringBuilder();
        int state = 0;
        int read;
        while ((read = in.read()) >= 0) {
            char c = (char) read;
            switch (state) {
                    // initial
                case 0:
                    if (c == '$') {
                        state = 1;
                    } else {
                        out.write(c);
                    }
                    break;
                    // $ read
                case 1:
                    if (c == '{') {
                        state = 2;
                    } else {
                        state = 0;
                        out.write('$');
                        out.write(c);
                    }
                    break;
                    // { read
                case 2:
                    if (c == '}') {
                        state = 0;
                        Object prop = getProperty(varBuffer.toString());
                        if (prop != null) {
                            out.write(ResponseUtil.escapeXml(prop.toString()));
                        }
                        varBuffer.setLength(0);
                    } else {
                        varBuffer.append(c);
                    }
            }
        }
        in.close();
        out.flush();
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