在路由功能之前，如何使 Ktor 功能从 ApplicationCall 上下文中获取内容？主要目标是获取而不是消费，以便所有下一个拦截器都可以使用它。
如果我们要这样做：
pipeline.intercept(ApplicationCallPipeline.Call) {
feature.intercept(this)
val content = call.receiveText()
proceed()
}
或者像这样
pipeline.intercept(ApplicationCallPipeline.Call) {
val params = this.call.receiveParameters().entries()
proceed()
}
我们将进行下一步：
java.io.IOException: Broken delimiter occurred
at kotlinx.coroutines.experimental.io.DelimitedKt$skipDelimiterSuspend$2.doResume(Delimited.kt:57)
at kotlinx.coroutines.experimental.io.DelimitedKt$skipDelimiterSuspend$2.invoke(Delimited.kt)
at kotlinx.coroutines.experimental.io.DelimitedKt$skipDelimiterSuspend$2.invoke(Delimited.kt)
at kotlinx.coroutines.experimental.io.ByteBufferChannel.lookAheadSuspend(ByteBufferChannel.kt:1746)
at kotlinx.coroutines.experimental.io.DelimitedKt.skipDelimiterSuspend(Delimited.kt:55)
at kotlinx.coroutines.experimental.io.DelimitedKt.skipDelimiter(Delimited.kt:50)
at io.ktor.http.cio.MultipartKt.boundary(Multipart.kt:89)
at io.ktor.http.cio.MultipartKt$parseMultipart$1.doResume(Multipart.kt:158)
at kotlin.coroutines.experimental.jvm.internal.CoroutineImpl.resume(CoroutineImpl.kt:42)
at kotlinx.coroutines.experimental.DispatchedKt.resumeCancellable(Dispatched.kt:209)
at kotlinx.coroutines.experimental.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:35)
at kotlinx.coroutines.experimental.CoroutineStart.invoke(CoroutineStart.kt:111)
at kotlinx.coroutines.experimental.AbstractCoroutine.start(AbstractCoroutine.kt:165)
at kotlinx.coroutines.experimental.channels.ProduceKt.produce(Produce.kt:95)
at kotlinx.coroutines.experimental.channels.ProduceKt.produce$default(Produce.kt:88)
at io.ktor.http.cio.MultipartKt.parseMultipart(Multipart.kt:145)
at io.ktor.http.cio.MultipartKt.parseMultipart(Multipart.kt:138)
at io.ktor.http.cio.CIOMultipartDataBase.<init>(CIOMultipartData.kt:33)
at io.ktor.http.cio.CIOMultipartDataBase.<init>(CIOMultipartData.kt:31)
at io.ktor.server.engine.DefaultTransformKt.multiPartData(DefaultTransform.kt:70)
at io.ktor.server.engine.DefaultTransformKt.access$multiPartData(DefaultTransform.kt:1)
at io.ktor.server.engine.DefaultTransformKt$installDefaultTransformations$2.doResume(DefaultTransform.kt:44)
at io.ktor.server.engine.DefaultTransformKt$installDefaultTransformations$2.invoke(DefaultTransform.kt)
at io.ktor.server.engine.DefaultTransformKt$installDefaultTransformations$2.invoke(DefaultTransform.kt)
at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:49)
at io.ktor.pipeline.Pipeline.execute(Pipeline.kt:22)
at io.ktor.request.ApplicationReceiveFunctionsKt.receive(ApplicationReceiveFunctions.kt:64)
at accreditation.controller.RequisitesRoutingKt$requisites$1$1.doResume(RequisitesRouting.kt:54)
at accreditation.controller.RequisitesRoutingKt$requisites$1$1.invoke(RequisitesRouting.kt)
at accreditation.controller.RequisitesRoutingKt$requisites$1$1.invoke(RequisitesRouting.kt)
at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:49)
at io.ktor.pipeline.Pipeline.execute(Pipeline.kt:22)
at io.ktor.routing.Routing.executeResult(Routing.kt:100)
at io.ktor.routing.Routing.interceptor(Routing.kt:25)
at io.ktor.routing.Routing$Feature$install$1.doResume(Routing.kt:66)
at io.ktor.routing.Routing$Feature$install$1.invoke(Routing.kt)
at io.ktor.routing.Routing$Feature$install$1.invoke(Routing.kt:51)
at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:49)
at accreditation.utils.logging.RequestLogger$Feature$install$1.doResume(RequestLogger.kt:80)
at accreditation.utils.logging.RequestLogger$Feature$install$1.invoke(RequestLogger.kt)
at accreditation.utils.logging.RequestLogger$Feature$install$1.invoke(RequestLogger.kt:66)
at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:49)
at io.ktor.features.ContentNegotiation$Feature$install$1.doResume(ContentNegotiation.kt:60)
at io.ktor.features.ContentNegotiation$Feature$install$1.invoke(ContentNegotiation.kt)
at io.ktor.features.ContentNegotiation$Feature$install$1.invoke(ContentNegotiation.kt:50)
at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:49)
at io.ktor.features.StatusPages.intercept(StatusPages.kt:55)
at io.ktor.features.StatusPages$Feature$install$1.doResume(StatusPages.kt:84)
at io.ktor.features.StatusPages$Feature$install$1.invoke(StatusPages.kt)
at io.ktor.features.StatusPages$Feature$install$1.invoke(StatusPages.kt:78)
at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:49)
at io.ktor.features.CallLogging$Feature$install$1.doResume(CallLogging.kt:69)
at io.ktor.features.CallLogging$Feature$install$1.invoke(CallLogging.kt)
at io.ktor.features.CallLogging$Feature$install$1.invoke(CallLogging.kt:61)
at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:49)
at io.ktor.pipeline.Pipeline.execute(Pipeline.kt:22)
at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$2.doResume(DefaultEnginePipeline.kt:66)
at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$2.invoke(DefaultEnginePipeline.kt)
at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$2.invoke(DefaultEnginePipeline.kt)
at io.ktor.pipeline.PipelineContext.proceed(PipelineContext.kt:49)
at io.ktor.pipeline.Pipeline.execute(Pipeline.kt:22)
at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.doResume(NettyApplicationCallHandler.kt:31)
at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invoke(NettyApplicationCallHandler.kt)
at io.ktor.server.netty.NettyApplicationCallHandler$handleRequest$1.invoke(NettyApplicationCallHandler.kt:10)
at kotlinx.coroutines.experimental.intrinsics.UndispatchedKt.startCoroutineUndispatched(Undispatched.kt:44)
at kotlinx.coroutines.experimental.CoroutineStart.invoke(CoroutineStart.kt:113)
at kotlinx.coroutines.experimental.AbstractCoroutine.start(AbstractCoroutine.kt:165)
at kotlinx.coroutines.experimental.BuildersKt__Builders_commonKt.launch(Builders.common.kt:72)
at kotlinx.coroutines.experimental.BuildersKt.launch(Unknown Source)
at kotlinx.coroutines.experimental.BuildersKt__Builders_commonKt.launch$default(Builders.common.kt:64)
at kotlinx.coroutines.experimental.BuildersKt.launch$default(Unknown Source)
at io.ktor.server.netty.NettyApplicationCallHandler.handleRequest(NettyApplicationCallHandler.kt:22)
at io.ktor.server.netty.NettyApplicationCallHandler.channelRead(NettyApplicationCallHandler.kt:16)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:38)
at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:353)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:463)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)
主要思想是在路由功能处理之前记录请求内容（如果它是 Json 或 UrlEncoded），并记录每个响应内容。