in src/main/java/com/spotify/github/v3/clients/GitHubClient.java [529:537]
<T> CompletableFuture<T> request(
final String path, final Class<T> clazz, final Map<String, String> extraHeaders) {
final Request.Builder builder = requestBuilder(path);
extraHeaders.forEach(builder::addHeader);
final Request request = builder.build();
log.debug("Making request to {}", request.url().toString());
return call(request)
.thenApply(body -> json().fromJsonUncheckedNotNull(responseBodyUnchecked(body), clazz));
}