You can try using a Filter for getting the response output stream, doing the 
things with the API and putting the result in the request, then wrap the 
response with HttpServletResponseWrapper(response) before passing to 
chain.doFilter(request, wrapper). Maybe it's not the solution you expect... If 
not using a filter, i can't remember if first calling a servlet that does this 
and then forwarding to the jsp with the result would work too...
But for sure, you can't do it inside the JSP

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