Send HTTP requests and handle response headers using the new HttpClient in Java 13

Send HTTP requests and handle response headers using the new HttpClient in Java 13

Java 13 introduces the new HttpClient class, which is a modern API for sending HTTP requests and receiving responses. It provides a concise and flexible way to communicate with web services.

In this article, we will learn how to send HTTP requests using the new HttpClient class in Java 13 and process the response headers after receiving the response. We'll demonstrate this process with a simple code example.

First, we need to create an HttpClient instance. We can use HttpClient.newBuilder() to obtain a default HttpClient instance.

HttpClient httpClient = HttpClient.newBuilder()
                                 .build();

Next, we can use the HttpClient instance to send HTTP requests. In this example, we will send a GET request to the "https://www.example.com" website:

HttpRequest request = HttpRequest.newBuilder()
                                .uri(URI.create("https://www.example.com"))
                                .build();

HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());

In the above code, we first create an HttpRequest object and specify the The URL sent. Then, by calling the httpClient.send(request, HttpResponse.BodyHandlers.ofString()) method, we send the request and get an HttpResponse object in response.

Finally, we can get the header information in the response and further process them by calling the response.headers() method. The following is a sample code snippet:

HttpHeaders headers = response.headers();
headers.map().forEach((key, value) -> System.out.println(key + ": " + value));

In the above code, we first call the response.headers() method to get the headers in the HttpResponse. Then, the header is converted into an object of type Map> by calling the map() method, the forEach() method is used to traverse the Map, and the keys and values ​​of the header are printed out.

Through the above code example, we can easily use the new HttpClient class in Java 13 to send HTTP requests and process the response header information. This new API greatly simplifies the use of old HTTP client libraries such as HttpURLConnection or Apache HttpClient. It provides a simpler and more intuitive interface and supports asynchronous requests and non-blocking I/O operations.

Although we only demonstrate how to handle the response header information in this article, the HttpClient class of Java 13 also provides many other functions, such as sending POST requests, processing response bodies, etc. If you are interested in these functions, you can refer to the official documentation or other related resources for more in-depth study.

In summary, the new HttpClient class in Java 13 provides developers with a modern, concise and flexible way to send HTTP requests and process responses. It is a very useful API that helps us communicate with web services more easily and handle various details of the HTTP protocol.

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