OkHttp 提供了对用户认证的支持。当 HTTP 响应的状态代码是 401 时，OkHttp 会从设置的 Authenticator 对象中获取到新的 Request 对象并再次尝试发出请求。Authenticator 接口中的 authenticate 方法用来提供进行认证的 Request 对象，authenticateProxy 方法用来提供对代理服务器进行认证的 Request 对象。
用户认证的示例：
OkHttpClient client = new OkHttpClient();
client.setAuthenticator(new Authenticator() {
public Request authenticate(Proxy proxy, Response response) throws IOException {
String credential = Credentials.basic("user", "password");
return response.request().newBuilder()
.header("Authorization", credential)
.build();
}
public Request authenticateProxy(Proxy proxy, Response response)
throws IOException {
return null;
}
});
进阶
当需要实现一个 Basic challenge， 使用 Credentials.basic(username, password) 来编码请求头。
private final OkHttpClient client = new OkHttpClient();
public void run() throws Exception {
client.setAuthenticator(new Authenticator() {
@Override public Request authenticate(Proxy proxy, Response response) {
System.out.println("Authenticating for response: " + response);
System.out.println("Challenges: " + response.challenges());
String credential = Credentials.basic("jesse", "password1");
return response.request().newBuilder()
.header("Authorization", credential)
.build();
}
@Override public Request authenticateProxy(Proxy proxy, Response response) {
return null; // Null indicates no attempt to authenticate.
}
});
Request request = new Request.Builder()
.url("http://publicobject.com/secrets/hellosecret.txt")
.build();
Response response = client.newCall(request).execute();
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
System.out.println(response.body().string());
}