in src/main/java/org/apache/sling/tooling/support/source/impl/SourceReferencesServlet.java [85:92]
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
response.setContentType("application/json");
writeBundleSourceJson(response.getWriter(), ctx.getBundles());
} catch (IOException e) {
throw new ServletException(e);
}
}