HttpResponse<JsonNode> response = Unirest.get("http://api.example.com") .header("accept", "application/json") .queryString("apiKey", "your-api-key") .asJson(); System.out.println(response.getBody()); HttpClient httpClient = HttpClientBuilder.create().build(); HttpGet request = new HttpGet("http://api.example.com"); request.addHeader("accept", "application/json"); URIBuilder uriBuilder = new URIBuilder(request.getURI()); uriBuilder.addParameter("apiKey", "your-api-key"); request.setURI(uriBuilder.build()); HttpResponse response = httpClient.execute(request); HttpEntity entity = response.getEntity(); if (entity != null) { InputStream inputStream = entity.getContent(); } OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("http://api.example.com") .header("accept", "application/json") .build(); Response response = client.newCall(request).execute(); System.out.println(response.body().string());