在Okhttp中处理身份验证

Question

根据OKHttp文档，我使用OkHttp 2.3以及基本身份验证请求，它会自动重试未经身份验证的请求，但每当我提供无效凭据时，请求会花费太多时间，最后我会得到此异常：

java.net.ProtocolException：太多的后续请求：21

如何防止OkHttp从自动重试身份认证的请求，并返回401 Unauthorized呢？

Answer 1

protected Authenticator getBasicAuth(final String username, final String password) { 
    return new Authenticator() { 
     private int mCounter = 0; 

     @Override 
     public Request authenticate(Proxy proxy, Response response) throws IOException { 
      if (mCounter++ > 0) { 
       throw new AuthenticationException(
         AuthenticationException.Type.INVALID_LOGIN, response.message()); 
      } 

      String credential = Credentials.basic(username, password); 
      return response.request().newBuilder().header("Authorization", credential).build(); 
     } 

     @Override 
     public Request authenticateProxy(Proxy proxy, Response response) throws IOException { 
      return null; 
     } 
    }; 
} 

在我的身份验证器中，我简单地计算了尝试 - 在X尝试后，我抛出一个异常。

Answer 2

修改Traxdata的回答版本的作品：

protected Authenticator getBasicAuth(final String username, final String password) { 
    return new Authenticator() { 
     private int mCounter = 0; 

     @Override 
     public Request authenticate(Route route, Response response) throws IOException { 
      Log.d("OkHttp", "authenticate(Route route, Response response) | mCounter = " + mCounter); 
      if (mCounter++ > 0) { 
       Log.d("OkHttp", "authenticate(Route route, Response response) | I'll return null"); 
       return null; 
      } else { 
       Log.d("OkHttp", "authenticate(Route route, Response response) | This is first time, I'll try to authenticate"); 
       String credential = Credentials.basic(username, password); 
       return response.request().newBuilder().header("Authorization", credential).build(); 
      } 
     } 
    }; 
} 

然后，你需要：

OkHttpClient.Builder builder = new OkHttpClient.Builder(); 
builder.authenticator(getBasicAuth("username", "pass")); 
retrofit = new Retrofit.Builder() 
      .baseUrl(BASE_URL) 
      .client(builder.build()) 
      .addConverterFactory(GsonConverterFactory.create()) 
      .build(); 

就是这样。