<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.13</version> </dependency> CloseableHttpClient httpClient = HttpClientBuilder.create().build(); HttpGet httpGet = new HttpGet("http://example.com/api/resource"); httpGet.addHeader("Accept", "application/json"); CloseableHttpResponse response = httpClient.execute(httpGet); HttpEntity entity = response.getEntity(); String responseBody = EntityUtils.toString(entity, "UTF-8"); <dependency> <groupId>com.squareup.okhttp3</groupId> <artifactId>okhttp</artifactId> <version>4.9.1</version> </dependency> OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("http://example.com/api/resource") .addHeader("Accept", "application/json") .build(); Response response = client.newCall(request).execute(); String responseBody = response.body().string(); <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>5.3.9</version> </dependency> RestTemplate restTemplate = new RestTemplate(); String responseBody = restTemplate.getForObject("http://example.com/api/resource", String.class);