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@GET
@Path("/search")
@Produces(MediaType.APPLICATION_JSON)
public JsonObject search(@QueryParam("q") final String query, @Context final TracerContext tracing) throws Exception {
    final GoogleBooksApi api = Feign.builder()
        .client(new TracingClient(new ApacheHttpClient(), tracing.unwrap(Tracer.class)))
        .target(GoogleBooksApi.class, "https://www.googleapis.com/books/v1/volumes");

    final Response response = api.search(query);
    try (final Reader reader = response.body().asReader()) {
        return Json.createReader(reader).readObject();
    }
}