how to set common header for all RequestMappings in a controller

In my controller i have the following line in each requestMapping method :
        response.setHeader(contentSecurityolicy.getHttpHeader(), contentSecurityPolicy.toString());

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There are 4 such methods... Is there any way i can avoid this so as to specify this header only once in controller and
it gets added to all the responses ?

Rohit BajajAsked:
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Rohit BajajAuthor Commented:
Also in some codebase i saw that they created a filter for adding content security policy header.
Whats the correct approach as per designing ?
Should i just add it like above in each request mapping.. or create a filter and so controller does not know about adding of this header ?
mccarlIT Business Systems Analyst / Software DeveloperCommented:
Ok, it is not so obvious but any method annotated with @ModelAttribute will get executed for any of the 4 methods in your controller, so you could add the following to your controller...

public void setContentSecurityPolicyHeader(HttpServletResponse response) {
        response.setHeader(contentSecurityolicy.getHttpHeader(), contentSecurityPolicy.toString());

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As for what is the best design, it depends on a few factors... If you are setting the same headers from *multiple* controllers than it might be best to use a filter. Also, only if the resources that need the headers can be distinguished from those that shouldn't have them based on the request path (as that generally decides what filters to run). Also, it may depend on whether any data available in the controller affects what gets set in the headers.

From the limited info that you provide above, it looks like the controller doesn't have much input as to what is set for those headers, so my feeling would be that it would be better set in a filter.

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