private Response post(String path, byte[] body) throws IOException {
    return client.newCall(new Request.Builder()
      .url(url(server, path))
      .post(RequestBody.create(body))
      .build()).execute();
  }
Integration test suite for autocomplete tags.
<p>
Verifies that the whitelist of key can be configured via "zipkin.storage.autocomplete-keys".
zipkin-server/src/test/java/zipkin2/server/internal/ITZipkinServerAutocomplete.java