Adding an HTTP Header to the request in a servlet filter

by

Extend HttpServletRequestWrapper, override the header getters to return the parameters as well:

public class AddParamsToHeader extends HttpServletRequestWrapper {
    public AddParamsToHeader(HttpServletRequest request) {
        super(request);
    }

    public String getHeader(String name) {
        String header = super.getHeader(name);
        return (header != null) ? header : super.getParameter(name); // Note: you can't use getParameterValues() here.
    }

    public Enumeration getHeaderNames() {
        List<String> names = Collections.list(super.getHeaderNames());
        names.addAll(Collections.list(super.getParameterNames()));
        return Collections.enumeration(names);
    }
}

..and wrap the original request with it:

chain.doFilter(new AddParamsToHeader((HttpServletRequest) request), response);

That said, I personally find this a bad idea. Rather give it direct access to the parameters or pass the parameters to it.

More Related Contents:

  1. How to read request.getInputStream() multiple times
  2. Which compression (is GZIP the most popular) servlet filter would you suggest?
  3. How can I upload files to a server using JSP/Servlet?
  4. What is the difference between JSF, Servlet and JSP?
  5. How to use a servlet filter in Java to change an incoming servlet request url?
  6. How to read and copy the HTTP servlet response output stream content for logging
  7. Servlet for serving static content
  8. Can I exclude some concrete urls from inside ?
  9. Servlet vs Filter
  10. why business logic should be moved out of JSP?
  11. How to force browser to download file?
  12. How to redirect to Login page when Session is expired in Java web application?
  13. How can I get a Spring bean in a servlet filter?
  14. How are Servlet url mappings in web.xml used?
  15. How can I get the HTTP status code out of a ServletResponse in a ServletFilter?
  16. How are Threads allocated to handle Servlet request?
  17. Embedded tomcat 7 servlet 3.0 annotations not working
  18. The ultimate Java version table (J2EE, Java EE, Servlet, JSP, JSTL)
  19. How to properly logout of a Java EE 6 Web Application after logging in
  20. Call a servlet on click of hyperlink
  21. Maven dependency for Servlet 3.0 API?
  22. How to set session timeout dynamically in Java web applications?
  23. Is doFilter() executed before or after the Servlet’s work is done?
  24. Access Spring beans from a servlet in JBoss
  25. How to store a file on a server(web container) through a Java EE web application?
  26. Session TimeOut in web.xml
  27. Difference between include and forward mechanism for request dispatching concept?
  28. How can I manually load a Java session using a JSESSIONID?
  29. Differences between ServletResponse and HttpServletResponseWrapper?
  30. Why do we use web.xml? [closed]

Leave a Comment