Interceptors
Interceptors are a powerful mechanism that can monitor, rewrite, and retry calls. Here's a simple interceptor that logs the outgoing request and the incoming response.
插入器是一个很有用技巧 ，可以监控，重写和重新请求。下面举个栗子， 拦截器日志优于请求和即将到来响应；
A call to chain.proceed(request)is a critical part of each interceptor’s implementation. This simple-looking method is where all the HTTP work happens, producing a response to satisfy the request.Interceptors can be chained. Suppose you have both a compressing interceptor and a check summing interceptor: you'll need to decide whether data is compressed and then checksummed, or checksummed and then compressed. OkHttp uses lists to track interceptors, and interceptors are called in order.
一个请求 chain.proceed(request) 是一个临界的拦截器实现的部分，它简单可见的方法是对所有Http线程发生，生产响应对满意的请求，拦截器可以被束缚，支持你所有压缩拦截和求和拦截，你将需要决定是数据压缩然后检验，或者检验和再压缩。okhttp使用Lists集合去追踪拦截器，拦截器顺便被调用；
Interceptors are registered as either application or network interceptors. We'll use theLoggingInterceptor defined above to show the difference.
Register anapplication interceptor by calling addInterceptor() onOkHttpClient.Builder:
拦截器注册既不是应用也非网络拦截器，我们将使用这个LoggingInterceptor定义显示不同之处，注册在Application拦截器 通过调用addInterceptor方法在okHttpClient.Builder;
执行结果:
