in src/main/java/com/spotify/github/v3/clients/GitHubClient.java [599:608]
CompletableFuture<Response> post(
final String path, final String data, final Map<String, String> extraHeaders) {
final Request.Builder builder =
requestBuilder(path)
.method("POST", RequestBody.create(parse(MediaType.APPLICATION_JSON), data));
extraHeaders.forEach(builder::addHeader);
final Request request = builder.build();
log.debug("Making POST request to {}", request.url().toString());
return call(request);
}