HandlerFilter

HandlerFilter is analogous to the Servlet filter. This executes before the request gets processed by HandlerFunction. There could be chain filters that get executed before the request gets served. If a filter sends back a ServerResponse, then the request is terminated as follows:

helloRoute.filter((request, next) -> {    if (request.headers().acceptCharset().contains(Charset.forName("UTF-8"))) {        return next.handle(request);    }    else {        return ServerResponse.status(HttpStatus.BAD_REQUEST).build();    }});

The preceding code is doing the following:

  1. Adding a filter to helloRoute using the filter() method 
  2. The filter takes a request and the next handler function
  3. Validating whether or not the request headers contain the UTF-8 charset in ...

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