How we can modify headers in request Object using Filter

Question

I need to create a Filter and modify header values set in request Object. How we can modify headers in request Object using Filter?, there is no setHeader method available in request Object.

Does this answer your question? [Adding an HTTP Header to the request in a servlet filter](https://stackoverflow.com/questions/2811769/adding-an-http-header-to-the-request-in-a-servlet-filter) — damndemon, Aug 11 '22 at 15:07

score 5 · Accepted Answer · edited May 23 '17 at 11:50

5

You can use javax.servlet.http.HttpServletRequestWrapper to wrap the HttpServletRequest object passed by the server.

In the wrapper class you need to override getHeader method and return modified value of header.

You can refer to similar post over here Modify request parameter with servlet filter

edited May 23 '17 at 11:50

Community

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answered Mar 08 '13 at 13:19

Rutesh Makhijani

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score -1 · Answer 2 · edited Jan 21 '19 at 11:48

You can import Collectors using

import java.util.stream.Collectors;

Add the method below into your class.

private Map<String, String> convertHeadersToLowerCase(Map<String, String> headers) {
    return headers
            .entrySet()
            .stream()
            .collect(Collectors.toMap(entry -> entry.getKey().toLowerCase(), entry -> entry.getValue()));
}

Then before returning headers in the response, you should ensure they are converted before returning by adding the following into the Controller of your Response method:

requestHeaders = convertRequestHeadersToLowerCase(requestHeaders);

OP asked about modifying headers in the *request*, not the *response*. — Max Leske, Feb 12 '21 at 10:47

How we can modify headers in request Object using Filter

2 Answers2