A null valued PushPromiseHandler rejects any push promises. Push promises received, if any, are handled by the given PushPromiseHandler. For each resource, the server sends a special request, known as a push promise to the client. It is really the multiplexing feature of HTTP/2 that allows us to forget about resource bundling. It allows the server to “push” content to the client additional resources while requesting the primary resource, saving more roundtrip and as a result improves performance in page rendering. New HttpClient supports push promises through PushPromiseHandler interface. The new API can also deal with multiple responses, and stream the request and response bodies: So, now we can use sendAsync(.) method - which returns CompletableFeature - to process a request asynchronously: CompletableFuture> response = HttpClient.newBuilder() However, it has a lot of drawbacks especially when we are processing large amounts of data. This call returns an HttpResponse object, and we're sure that the next instruction from our application flow will be run only when the response is already here. Up until now, the send(.) method naturally waits for a response: HttpResponse response = HttpClient.newBuilder()
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