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<h1>OkHttp</h1>
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<h2>An <strong>HTTP & SPDY</strong> client for Android and Java applications</h2>
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<h3 id="overview">Overview</h3>
<p>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.</p>
<p>OkHttp is an HTTP client that’s efficient by default:</p>
<ul>
<li>HTTP/2 and SPDY support allows all requests to the same host to share a socket.</li>
<li>Connection pooling reduces request latency (if SPDY isn’t available).</li>
<li>Transparent GZIP shrinks download sizes.</li>
<li>Response caching avoids the network completely for repeat requests.</li>
</ul>
<p>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 initiates new connections
with modern TLS features (SNI, ALPN), and falls back to TLS 1.0 if the handshake
fails.</p>
<p>Using OkHttp is easy. Its 2.0 API is designed with fluent builders and
immutability. It supports both synchronous blocking calls and async calls with
callbacks.</p>
<p>You can try out OkHttp without rewriting your network code. The
<code>okhttp-urlconnection</code> module implements the familiar
<code>java.net.HttpURLConnection</code> API and the <code>okhttp-apache</code>
module implements the Apache <code>HttpClient</code> API.</p>
<p>OkHttp supports Android 2.3 and above. For Java, the minimum requirement is 1.7.</p>
<h3 id="examples">Examples</h3>
<h4>Get a URL</h4>
<p>This program downloads a URL and print its contents as a string. <a href="https://raw.github.com/square/okhttp/master/samples/guide/src/main/java/com/squareup/okhttp/guide/GetExample.java">Full source</a>.
<pre class="prettyprint">
OkHttpClient client = new OkHttpClient();
String run(String url) throws IOException {
Request request = new Request.Builder()
.url(url)
.build();
Response response = client.newCall(request).execute();
return response.body().string();
}
</pre>
<h4>Post to a Server</h4>
<p>This program posts data to a service. <a href="https://raw.github.com/square/okhttp/master/samples/guide/src/main/java/com/squareup/okhttp/guide/PostExample.java">Full source</a>.
<pre class="prettyprint">
public static final MediaType JSON
= MediaType.parse("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();
Response response = client.newCall(request).execute();
return response.body().string();
}
</pre>
<h3 id="download">Download</h3>
<p><a href="https://search.maven.org/remote_content?g=com.squareup.okhttp&a=okhttp&v=LATEST" class="dl version-href">↓ <span class="version-tag">Latest</span> JAR</a></p>
<p>You'll also need <a href="http://github.com/square/okio">Okio</a>, which OkHttp
uses for fast I/O and resizable buffers. Download the
<a href="https://search.maven.org/remote_content?g=com.squareup.okio&a=okio&v=LATEST">latest JAR</a>.
<p>The source code to OkHttp, its samples, and this website is <a href="http://github.com/square/okhttp">available on GitHub</a>.</p>
<h4>Maven</h4>
<pre class="prettyprint"><dependency>
<groupId>com.squareup.okhttp</groupId>
<artifactId>okhttp</artifactId>
<version><span class="version pln"><em>(insert latest version)</em></span></version>
</dependency></pre>
<h4>Gradle</h4>
<pre class="prettyprint">compile 'com.squareup.okhttp:okhttp:<span class="version pln"><em>(insert latest version)</em></span>'</pre>
<h3 id="contributing">Contributing</h3>
<p>If you would like to contribute code you can do so through GitHub by forking the repository and sending a pull request.</p>
<p>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 <code>mvn clean verify</code>.</p>
<p>Before your code can be accepted into the project you must also sign the <a href="http://squ.re/sign-the-cla">Individual Contributor License Agreement (CLA)</a>.</p>
<h3 id="license">License</h3>
<pre>Copyright 2014 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.</pre>
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