Carmine Giangregorio Carmine Giangregorio - 1 year ago 69
Java Question

Jetty and Dropwizard: how to return always 200 instead of 404, 500, etc

I'm using Dropwizard 0.8.0 that comes with Jetty-Jersey-Jackson stack.

For security reasons, I want to add a filter that makes every request that passes through a particular route defined with Jersey returns always 200, even in case of error (4xx, 5xx, etc.).

Is this possibile with Jetty/Servlet filters? Can I intercept the request after it passed through Jersey resource (the controller), but before it is returned to client, in order to modify the http status code?


I'm trying to do this with a ServletFilter, but it seems that the response is sent to client before my code is executed.

I've written the filter this way:

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
if (response instanceof HttpServletResponse) {
/* No pre-processing */

chain.doFilter(request, response);

/* Post-processing: */

HttpServletResponse modifiedResponse = (HttpServletResponse) response;

if (modifiedResponse.getStatus() != 200) {

With this, registered in Dropwizard with:

environment.servlets().addFilter("MyCustomFilter", new MyCustomFilter())
.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), true, "/mypath/*");

The filter is executed, and in the access.log I see all the requests with status code 200; but the client always get the "real" status code (ex, a 404, or a "Method not allowed").

It seems that the response is sent to client before the last part of filter is executed. Moreover, I can't modify the response body. I tried also with a HttpServletResponseWrapper, but with no luck.

Answer Source

I'm updating the question with my solution that finally works: I've used a Jersey filter instead of a Jetty http filtering, in order to manage directly the Response object from Jersey.

Obviously, this works only if you're using Jetty+Jersey, not with Jetty stand-alone.

Here's the filter I'm using:

 * When active, this filter transforms all responses for specified basePath to 200, even in case of error.
public class DiscardErrors implements ContainerResponseFilter
    private String basePath;

    public DiscardErrors(String basePath)
        this.basePath = basePath;

    public void filter(ContainerRequestContext containerRequestContext, ContainerResponseContext containerResponseContext) throws IOException
        if containerRequestContext.getUriInfo().getPath().startsWith(this.basePath) {
            if (containerResponseContext.getStatus() != 200) { // Check if response code is different from 200
                containerResponseContext.setStatus(200); // Force 200 status code
                containerResponseContext.setEntity(""); // Empty body


And register it in Dropwizard:

environment.jersey().register(new DiscardErrors("/"));
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