Dropwizard doesn't support HTTP trailers

[fmurray-r7]

Dropwizard doesn't seem to support HTTP trailer response headers, despite trailers being supported by jetty.

Is this something that can be added, considering it is supported by the underlying library and is part of the HTTP specifications?

[zUniQueX]

Hi @fmurray-r7. Since Jetty supports trailers, dropwizard supports them as well.

Trailers can be set through the servlet api. To do that, you'll inject the HttpServletResponse in your resource method and set the trailers:

@GET
public String helloWorld(@Context HttpServletResponse response) {
    response.setTrailerFields(() -> Map.of("Testkey", "Testvalue"));
    return "Hello World!";
}

To check, if the trailers are set correctly, you can use the Jetty client:

ContentResponse response = client
        .newRequest("http://localhost:8080")
        .method(HttpMethod.GET)
        .onResponseSuccess(response1 -> {
            if (response1 instanceof HttpResponse httpResponse) {
                System.out.println(httpResponse.getTrailers());
            }
        })
        .send();

[fmurray-r7]

Ah, my mistake, thank you for the clarification!