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I have a spring boot project which has some Rest APIs in it. I have two custom headers named request_date and tenant respectively.

I am trying to read the value of these headers in an interceptor, but it reads the value for only tenant and returns null for request_date.

Important

• I use a filter to wrap the request object because I want to read the request body later.


• There is a filter to add CORS headers.

When I run my project on localhost and debug the code, I am successfully able to read both the headers' values.

However, when I deploy my application in production and make the request using postman or some other client, the request_date header's value is always read as null.

I am not sure what seems to be the problem with this. I am using Spring boot v1.5.10.RELEASE and JDK 1.8

Note:

• I have tried to rename the header to something like input_date. However, it still reads null.

The following is the relevant code

TestInterceptor

public class TestInterceptor extends HandlerInterceptorAdapter {



    @Override

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {



        String requestDate = request.getHeader("request_date");

        String tenant = request.getHeader("Tenant");



        /*Perform some checks*/



        return super.preHandle(request, response, handler);

    }

}

CorsFilter

public class ApiCorsFilter extends OncePerRequestFilter {



    @Override

    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws ServletException, IOException {

        response.setHeader("Access-Control-Allow-Origin", "*");

        response.setHeader("Access-Control-Allow-Methods", "POST, GET, PATCH, OPTIONS, DELETE, PUT");

        response.setHeader("Access-Control-Max-Age", "3600");

        response.setHeader("Access-Control-Allow-Headers", "Content-Type, Access-Control-Allow-Headers," +

                " X-Requested-With, Origin, X-Auth-Token, Tenant, request_date");

        response.addHeader("Access-Control-Expose-Headers", "X-Auth-Token, Content-Disposition");

        chain.doFilter(request, response);

    }

}

RequestCacheFilter

public class RequestCacheFilter extends OncePerRequestFilter {



    @Override

    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,

                                    FilterChain filterChain) throws ServletException, IOException {



        HttpServletRequest req = new RequestWrapper(request);

        String body = ((RequestWrapper) req).getBody();



        /*Do some operation*/



        filterChain.doFilter(req, response);

    }

}

Some network tools can drop headers that contain underscore in it's name. As per this answer underscore is a legal character but it's uncommon and sometimes tools require additional configuration to support it.

Rename your header to requestDate or request-date and see if it helps. If it works without underscore than inspect network route between client and server e.g. maybe there is a proxy that drops them?

The issue was with the nginx configuration.

I set the underscores_in_headers on; for the server and now it doesn't drop the headers with underscore in their names.

The solution suggested by @Karol Dowbecki works as well. When I renamed my header to requestDate, I was able to read the value successfully.