/
MetaDataDemoClient.java
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/
MetaDataDemoClient.java
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/*
* Copyright © 2019 Apple Inc. and the ServiceTalk project authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.servicetalk.examples.http.metadata;
import io.servicetalk.http.api.BlockingHttpClient;
import io.servicetalk.http.api.HttpRequest;
import io.servicetalk.http.api.HttpResponse;
import io.servicetalk.http.netty.HttpClients;
import static io.servicetalk.http.api.HttpHeaderNames.CONTENT_LANGUAGE;
import static io.servicetalk.http.api.HttpResponseStatus.OK;
import static io.servicetalk.http.api.HttpSerializationProviders.textDeserializer;
/**
* Demonstrates a few features:
* <ul>
* <li>Setting query parameters.</li>
* <li>Checking response status.</li>
* <li>Checking response headers.</li>
* <li>Printing headers without redaction/filtering.</li>
* </ul>
*/
public final class MetaDataDemoClient {
public static final String LANGUAGE_NAME = "language";
public static void main(String[] args) throws Exception {
final String language = args.length == 1 ? args[0] : "en";
// "en" returns "Hello World!"
// "fr" returns "Bonjour monde!"
// Try anything else to demonstrate incorrect response status error handling.
// Note: this example demonstrates only blocking-aggregated programming paradigm, for asynchronous and
// streaming API see helloworld examples.
try (BlockingHttpClient client = HttpClients.forSingleAddress("localhost", 8080).buildBlocking()) {
HttpRequest httpRequest = client.get("/sayHello")
.addQueryParameters(LANGUAGE_NAME, language);
HttpResponse response = client.request(httpRequest);
// The `BiFunction` to `toString` can be used to print all or some header values without
// redaction/filtering.
System.out.println(response.toString((name, value) -> value));
if (!response.status().equals(OK)) {
throw new RuntimeException("Bad response status: " + response.status());
}
// Case insensitively check if the expected language is present.
if (!response.headers().containsIgnoreCase(CONTENT_LANGUAGE, language)) {
throw new RuntimeException("Incorrect language: " +
response.headers().get(CONTENT_LANGUAGE));
}
String responseBody = response.payloadBody(textDeserializer());
System.out.println("Response body: " + responseBody);
}
}
}