How to use

newBuilder

method

in

java.net.http.HttpRequest

  private void upgradeToH2c(Target target){
    try {
      httpClient.send(HttpRequest.newBuilder()
          .method("options", HttpRequest.BodyPublishers.noBody())
          .uri(URI.create(target.url()))
          .build(),
          HttpResponse.BodyHandlers.discarding());
    } catch (IOException | InterruptedException e) {
      throw new RuntimeException(e);
    }
  }
}

@Override
public Mono<ReactiveHttpResponse> executeRequest(ReactiveHttpRequest request) {
  HttpRequest.Builder requestBuilder = HttpRequest.newBuilder(request.uri())
      .method(request.method().toUpperCase(), provideBody(request));
  setUpHeaders(request, requestBuilder);
  if(requestTimeout > 0){
    requestBuilder = requestBuilder.timeout(Duration.ofMillis(requestTimeout));
  }
  if(tryUseCompression){
    requestBuilder = requestBuilder.setHeader(ACCEPT_ENCODING_HEADER, GZIP);
  }
  Java11ReactiveHttpResponse.ReactiveBodySubscriber bodySubscriber = new Java11ReactiveHttpResponse.ReactiveBodySubscriber();
  CompletableFuture<HttpResponse<Void>> response = httpClient.sendAsync(
      requestBuilder.build(), fromSubscriber(bodySubscriber));
  return Mono.fromFuture(response)
      .<ReactiveHttpResponse>map(resp -> {
        if(!resp.version().equals(httpClient.version())){
          throw new IllegalArgumentException("Incorrect response version:"+resp.version());
        }
        return new Java11ReactiveHttpResponse(resp, bodySubscriber.content(),
            returnPublisherClass, returnActualClass,
            jsonFactory, responseReader);
      })
      .onErrorMap(ex -> ex instanceof CompletionException
               && ex.getCause() instanceof java.net.http.HttpTimeoutException,
          ReadTimeoutException::new);
}

var body = request.body();
var httpRequestBuilder = HttpRequest.newBuilder();
var bodyPublisher = body
    .map(Body::asBodyPublisher)