Setting the host header in java httpClient

by vsasikalabe Updated: Jan 30, 2023

Guide Kit

In this kit, we're going to see how to setting the host header in java httpClient with step steps.Instead of setting the Header on each and every request, we can also configure it as a default header on the Client itself: Header header = new BasicHeader(HttpHeaders. CONTENT_TYPE, "application/json").An HTTP Client. An HttpClient can be used to send requests and retrieve their responses. An HttpClient is created through a builder . The builder can be used to configure per-client state, like: the preferred protocol version ( HTTP/1.1 or HTTP/2 ), whether to follow redirects, a proxy, an authenticator, etc.HTTP Requests are messages which are sent by the client or user to initiate an action on the server.A URI is a uniform resource identifier while a URL is a uniform resource locator. Hence every URL is a URI, abstractly speaking, but not every URI is a URL. This is because there is another subcategory of URIs, uniform resource names (URNs), which name resources but do not specify how to locate them.

Please check the code below,

Fig : Preview of the output that you will get on running this code from your IDE.

Code

Lines of Code : 42License : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries :

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Test {

    public static void main(String[] args) throws Exception {
        HttpClient client = HttpClient.newHttpClient();

        HttpRequest request = HttpRequest.newBuilder()
                .uri(new URI("http://httpbin.org/headers"))
                .GET()
                .build();

        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        System.out.println(response.body());
    }

}

{
  "headers": {
    "Content-Length": "0", 
    "Host": "httpbin.org", 
    "Http2-Settings": "AAEAAEAAAAIAAAABAAMAAABkAAQBAAAAAAUAAEAA", 
    "Upgrade": "h2c", 
    "User-Agent": "Java-http-client/11.0.2", 
    "X-Amzn-Trace-Id": "Root=1-5e89b28a-7028ca70c49af58d120493b1"
  }
}

private static final Set<String> DISALLOWED_HEADERS_SET;

static {
    // A case insensitive TreeSet of strings.
    TreeSet<String> treeSet = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
    treeSet.addAll(Set.of("connection", "content-length",
            "date", "expect", "from", "host", "upgrade", "via", "warning"));
    DISALLOWED_HEADERS_SET = Collections.unmodifiableSet(treeSet);
}

Instructions

Follow the steps carefully to get the output easily.

Install IntelliJ IDEA IDE on your computer.
Create a new project then create a (Test)class file.
Click on the topic and Copy the code snippet using 'copy' button and paste it in that class file.
Refer preview of the output to paste the exact code.(don't copy the output)
Run the file to generate the output.

I hope you found this useful.

I found this code snippet by searching for ' Setting the host header in java httpClient 'in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

The solution is created in IntelliJ IDEA Community Edition 2022.3.2.
The solution is tested on Java 19(Oracle JDK 19).

Using this solution, we are able to Setting the host header in java httpClient with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to Setting the host header in java httpClient.

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