Java Academy · Lesson

Request Bodies and Headers

POST data and set headers.

Request Bodies and Headers

GET requests rarely need a body, but POST, PUT, and PATCH do. The JDK HTTP client uses BodyPublisher objects to supply request bodies and builder methods to set headers.

This lesson covers sending data and controlling headers like Content-Type.

BodyPublishers.ofString

The simplest publisher sends a string body. Pass it to the POST(...) method on the request builder.

BodyPublishers.noBody() exists for requests with no body.

import java.net.URI;
import java.net.http.HttpRequest;
import java.net.http.HttpRequest.BodyPublishers;

public class Main {
    public static void main(String[] args) {
        String json = "{\"name\":\"Ada\"}";
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://example.com/users"))
            .POST(BodyPublishers.ofString(json))
            .build();
        System.out.println("Method: " + request.method());
    }
}

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