How to fix Findbugs HTTP parameter directly written to HTTP header output

Question

I have a class RequestFilter and @Override methods doFilterInternal. And when i add Header for response, findbugs show error HTTP parameter directly written to HTTP header o

Answer 1

Watch out if you wan't to set ETag header. ETag looks like W/"myetagvalue"

String etagHd = request.getHeader(HttpHeaders.ETAG);    
response.addHeader(HttpHeaders.ETAG,  URLEncoder.encode(etagHd,StandardCharsets.UTF_8.displayName()); 

Will be encoded W%2F%22myetagvalue%22 be carefull !