Java 11 http client example5/31/2023 ![]() ![]() Next week: How to process request and response bodies without having to keep them in memory in their entirety. Using BodyHandlers. If you call sendAsync, the call immediately returns with a CompletableFuture > that you can then chain further processing steps to. If you read my previous article, Java 11 Standard HTTP Client VS Apache HttpClient, the BodyHandler built-in implementations allowing as to immediately parse the body of a response (As in majority case in sync calls). If you use send, the method call blocks until the response is complete and then returns an HttpResponse. You also have to provide a BodyHandler, which you can get from BodyHandlers - it is in charge of transforming response bytes to something more amenable. With an HttpClient and HttpResponse in hand, you can call either send or sendAsync on the former. If the request has a body, provide it as a BodyPublisher you will mostly use the factory methods on BodyPublishers for that. You can override the client's HTTP version, timeout, and so forth. build ( ) you get an immutable and reusable HttpRequest. You can $configure preferred HTTP version, timeout, proxy, cookie handler, executor for asynchronous requests, and more. build ( ) you get an immutable and reusable HttpClient. ![]() You need two ingredients to send a request: Handling the request/response lifecycle asynchronously is pretty neat, but it still suffers from a (potential) downside: Both the request's and the response's body have to be processed in one piece. ![]() The principal fact is that our thread is free to do other things while requests are send and responses received in the background. This is not a benchmark, though, so never mind. This usually takes about 75% of the time of the blocking approach, which, I have to admit, I find surprisingly slow. newBuilder ( ), configure ahead, and finish with build ( ):īodyPublisher requestBody = BodyPublishers. To create an HttpClient, simply call HttpClient. Let's quickly go through the steps one by one. You can configure clients and requests wherever you want, keep them around, and reuse them without worrying about negative interactions between different requests or threads.Īnd even though I recently went on record badmouthing the builder pattern, I think this is a great use case for it. Right off the bat, I love the focus on immutability!
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