如何确保响应中存在某些http标头

Question

I'm new to spring, so please excuse my ignorance.

I want to ensure that every response from my application contains the following headers:

Content-Type → application/json;charset=UTF-8
Date →Tue, 22 Nov 2016 16:30:21 GMT

is there a easy way of doing this, which I am missing? any advice or possible solutions would be great. Thanks all :)

Answer 1

I am not sure if that is going to work for you or not, because i cannot test it. the thing that I am sure of, is that you can do it, and the easiest way is :

create a spring interceptor and override postHandle methode.

try this out:

Interceptor class :

package com.mkyong.common.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class MyInterceptor extends HandlerInterceptorAdapter{


    public void postHandle(
        HttpServletRequest request, HttpServletResponse response,
        Object handler, ModelAndView modelAndView)
        throws Exception {

        response.setHeader("Content-Type","application/json;charset=UTF-8");
    }
}

here is the list of header fields you can set, and dont forget to declare this class as spring bean.

<interceptors>
        <interceptor>
            <mapping path="/**" />
            <beans:bean class="package.MyInterceptor"></beans:bean>
        </interceptor>
</interceptors>

Answer 2

so, I solved this by creating a custom filter like so :

@Component
public class ResponseHeaderFilter implements Filter {
  @Override
  public void init(FilterConfig filterConfig) throws ServletException {

  }

  @Override
  public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
      throws IOException, ServletException {

    HttpServletResponse response = (HttpServletResponse) resp;

    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss z");
    String dateString = simpleDateFormat.format(UnixTime.now() * 1000);

    response.setHeader("Date", dateString);
    response.setHeader("Content-Type", "application/json;charset=UTF-8");

    chain.doFilter(req, resp);

  }

  @Override
  public void destroy() {

  }
}

this then created another problem with another custom filter in the code base. so I solve this additional problem with the help of this blog post: http://mtyurt.net/2015/07/15/spring-how-to-insert-a-filter-before-springsecurityfilterchain/ . Hope this helps someone :)