How to fix Findbugs HTTP parameter directly written to HTTP header output

Question

I have a class RequestFilter and @Override methods doFilterInternal. And when i add Header for response, findbugs show error HTTP parameter directly written to HTTP header o

Answer 1

I think this is HRS_REQUEST_PARAMETER_TO_HTTP_HEADER error, and you can fix it like that:

String rqHd = request.getHeader("Access-Control-Request-Headers"); 
if(rqHd != null){
    String rqHeader = URLEncoder.encode(rqHd,StandardCharsets.UTF_8.displayName());   
    response.addHeader("Access-Control-Allow-Headers", rqHeader);
}