How I Can I Get Header from Httpservletresponse? [Closed]

There is a method in that getHeader()

Note:Available only for servelt 3.0,If not you can't use this.

and

This method considers only response headers set or added via setHeader(java.lang.String, java.lang.String), addHeader(java.lang.String, java.lang.String), setDateHeader(java.lang.String, long), addDateHeader(java.lang.String, long), setIntHeader(java.lang.String, int), or addIntHeader(java.lang.String, int), respectively.

HttpServletResponse.getHeader("key") returns first value

HttpServletResponse.getHeaders("key) return all values belonging to this key.

The HttpServletResponse.getHeaders method is almost certainly what you want to use.

HttpServletResponse#getHeaders(java.lang.String) returns you a list of all headers for that string value