HTTP+SPDY 客戶端Java開發包：okhttp

okhttp 是一個 Java 的 HTTP+SPDY 客戶端開發包，同時也支持 Android。

kHttp is an HTTP client that’s efficient by default:

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

示例代碼：

   OkHttpClient client = new OkHttpClient();

    String post(URL url, byte[] body) throws IOException {
      HttpURLConnection connection = client.open(url);
      OutputStream out = null;
      InputStream in = null;
      try {
        // Write the request.
        connection.setRequestMethod("POST");
        out = connection.getOutputStream();
        out.write(body);
        out.close();

        // Read the response.
        if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
          throw new IOException("Unexpected HTTP response: "
              + connection.getResponseCode() + " " + connection.getResponseMessage());
        }
        in = connection.getInputStream();
        return readFirstLine(in);
      } finally {
        // Clean up.
        if (out != null) out.close();
        if (in != null) in.close();
      }
    }

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