OkHttp官方教程

简介: OkHttp官方教程

OkHttp

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:

  • HTTP/2 support allows all requests to the same host to share a socket.
  • Connection pooling reduces request latency (if HTTP/2 isn’t available).
  • Transparent GZIP shrinks download sizes.
  • Response caching avoids the network completely for repeat requests.

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 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.

Get a URL

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();
  }
}

Post to a Server

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();
  }
}

Further examples are on the OkHttp Recipes page.


Requirements

OkHttp works on Android 5.0+ (API level 21+) and on Java 8+.

OkHttp depends on Okio for high-performance I/O and the Kotlin standard library. Both are small libraries with strong backward-compatibility.

We highly recommend you keep OkHttp up-to-date. As with auto-updating web browsers, staying current with HTTPS clients is an important defense against potential security problems. We track the dynamic TLS ecosystem and adjust OkHttp to improve connectivity and security.

OkHttp uses your platform’s built-in TLS implementation. On Java platforms OkHttp also supports Conscrypt, which integrates BoringSSL with Java. OkHttp will use Conscrypt if it is the first security             provider:

Security.insertProviderAt(Conscrypt.newProvider(), 1);

The OkHttp 3.12.x branch supports Android 2.3+ (API level 9+) and Java 7+. These platforms lack support for TLS 1.2 and should not be used. But because upgrading is difficult we will backport critical fixes to the 3.12.x branch            through December 31, 2020.


Releases

Our change log has release history.

implementation("com.squareup.okhttp3:okhttp:4.2.1")

Snapshot builds are available. R8 and ProGuard rules are available.


MockWebServer

OkHttp includes a library for testing HTTP, HTTPS, and HTTP/2 clients.

testImplementation("com.squareup.okhttp3:mockwebserver:4.2.1")

License

Copyright 2019 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.


相关文章
|
JSON 缓存 前端开发
鸿蒙开发之网络框架搭建,MVP+Retrofit2+okhttp3+Rxjava2+RxHarmony2
鸿蒙开发之网络框架搭建,MVP+Retrofit2+okhttp3+Rxjava2+RxHarmony
334 1
|
缓存 Java 开发工具
Android开发之OkHttp介绍
Android开发之OkHttp介绍
184 0
Android开发之OkHttp介绍
|
存储 缓存 网络协议
源码阅读 | Okhttp
源码阅读 | Okhttp
|
JSON 安全 Java
Retrofit入门
Retrofit入门
|
JSON Java 数据格式
Retrofit笔记 | 基本使用步骤
Retrofit笔记 | 基本使用步骤
|
JSON Java 数据格式
rxjava2+retrofit2 简介
rxjava2+retrofit2 简介
101 0
|
存储 Android开发
OkHttp源码详解之Okio源码详解
OkHttp源码详解之Okio源码详解
OkHttp源码详解之Okio源码详解
|
缓存 网络协议 Java
OkHttp源码详解之二完结篇
OkHttp源码详解之二完结篇
OkHttp源码详解之二完结篇
|
缓存
【OkHttp】OkHttp 简介 ( OkHttp 框架特性 | Http 版本简介 )
【OkHttp】OkHttp 简介 ( OkHttp 框架特性 | Http 版本简介 )
388 0
【OkHttp】OkHttp 简介 ( OkHttp 框架特性 | Http 版本简介 )
|
缓存 Java 调度
okhttp源码解析
okhttp介绍 OkHttp是一个非常优秀的网络请求框架,已被谷歌加入到Android的源码中。目前比较流行的Retrofit也是默认使用OkHttp的。
1714 0