HttpLoggingInterceptor 不记录

Question

我在使用 HttpLoggingInterceptor 时遇到了奇怪的行为。我注意到如果我使用 newBuilder() 日志记录不起作用。

// instantiate object (in app)
val okHttpRequestManager: HttpRequestManager = OkHttpRequestManager(OkHttpClient(), null)

// execute request (in app)
okHttpRequestManager.execute(request, callback)


// another class (in request module)
open class OkHttpRequestManager(private val client: OkHttpClient,
                                 private val httpLoggingInterceptor: HttpLoggingInterceptor?) : HttpRequestExecutor {


    override fun execute(httpRequest: HttpRequest, callback: HttpResponseCallback?) {

        if (httpLoggingInterceptor != null) {
            client.newBuilder().addInterceptor(httpLoggingInterceptor).build()
        }

        // perform request below
        ...
    }
}

上面的代码 sn -p 不起作用。但是，如果我将参数设为构建器，则一切正常。使用 newBuilder() 是不正确的方法吗？

// the below works
// another class (in request module)
open class OkHttpRequestManager(private val client: OkHttpClient.Builder,
                                 private val httpLoggingInterceptor: HttpLoggingInterceptor?) : HttpRequestExecutor {


    override fun execute(httpRequest: HttpRequest, callback: HttpResponseCallback?) {

        if (httpLoggingInterceptor != null) {
            // no newBuilder() or build() and works like a charm
            client.addInterceptor(httpLoggingInterceptor) 
        }

        // perform request below
        ...
    }
}

有人知道这是为什么吗？

Answer 1

这是因为newBuilder() 方法顾名思义，返回新的构建器对象，当您在其上调用build() 时，将从新构建器创建的OkHttpClient 的新实例返回。

这里是源代码：

/** Prepares the [request] to be executed at some point in the future. */
  override fun newCall(request: Request): Call {
    return RealCall.newRealCall(this, request, forWebSocket = false)
  }

build()方法

fun build(): OkHttpClient = OkHttpClient(this)

newBuilder 添加到现有客户端的属性，因此您 将有一个新的客户端同时具有旧属性和新属性。

如果你想使用newBuilder()方法那么你需要使用新创建的OkHttpClient。

// another class (in request module)
open class OkHttpRequestManager(private val client: OkHttpClient,
                                 private val httpLoggingInterceptor: HttpLoggingInterceptor?) : HttpRequestExecutor {


    override fun execute(httpRequest: HttpRequest, callback: HttpResponseCallback?) {

        if (httpLoggingInterceptor != null) {
            val newClient = client.newBuilder().addInterceptor(httpLoggingInterceptor).build()
        }

        // perform request below using newClient
        ...
    }
}