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| ← Connections | -OkHttp User's Guide | -Interceptors → | -
HTTP is the way modern applications network. It’s how we exchange data & media. - Doing HTTP efficiently makes your stuff load faster and saves bandwidth.
- -OkHttp is an HTTP client that’s efficient by default:
-OkHttp perseveres when the network is troublesome: it will silently recover from - common connection problems. If your service has multiple IP addresses OkHttp will - attempt alternate addresses if the first connect fails. This is necessary for IPv4+IPv6 - and for services hosted in redundant data centers. OkHttp supports modern TLS - features (TLS 1.3, ALPN, certificate pinning). It can be configured to fall back for - broad connectivity.
- -Using OkHttp is easy. Its request/response API is designed with fluent builders and - immutability. It supports both synchronous blocking calls and async calls with - callbacks.
- -OkHttp supports Android 5.0+ (API level 21+) and Java 8+.
- -This program downloads a URL and prints its contents as a string. Full source. -
-OkHttpClient client = new OkHttpClient();
-
-String run(String url) throws IOException {
- Request request = new Request.Builder()
- .url(url)
- .build();
-
- try (Response response = client.newCall(request).execute()) {
- return response.body().string();
- }
-}
-
- This program posts data to a service. Full source. - -
-public static final MediaType JSON
- = MediaType.get("application/json; charset=utf-8");
-
-OkHttpClient client = new OkHttpClient();
-
-String post(String url, String json) throws IOException {
- RequestBody body = RequestBody.create(JSON, json);
- Request request = new Request.Builder()
- .url(url)
- .post(body)
- .build();
- try (Response response = client.newCall(request).execute()) {
- return response.body().string();
- }
-}
-
-
- You'll also need Okio, which OkHttp - uses for fast I/O and resizable buffers. Download the - latest JAR. -
The source code to OkHttp, its samples, and this website is available on GitHub.
- -<dependency>
- <groupId>com.squareup.okhttp3</groupId>
- <artifactId>okhttp</artifactId>
- <version>(insert latest version)</version>
-</dependency>
-
- implementation 'com.squareup.okhttp3:okhttp:(insert latest version)'
-
- If you would like to contribute code you can do so through GitHub by forking the repository and sending a pull request.
-When submitting code, please make every effort to follow existing conventions and style in order to keep the code as readable as possible. Please also make sure your code compiles by running ./gradlew check.
Some general advice
-Before your code can be accepted into the project you must also sign the Individual Contributor License Agreement (CLA).
- -Copyright 2016 Square, Inc. - -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.-
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