Akka流/ HTTP：从响应中获取原始请求

问题描述

我有一个Akka Streams源，它流经流程并发布HTTP请求：

I have an Akka Streams source that goes through a flow and posts an HTTP request:

source.map(toRequest)
  .via(Http().outgoingConnection(host))
  .map(toMessage)

假设 toRequest 方法将一个字符串映射到 HttpRequest 和 toMessage 方法将 HttpResponse 映射到处理下游所需的消息类。假设消息类需要包含一些原始信息。

Suppose that the toRequest method maps a string to an HttpRequest, and the toMessage method maps the HttpResponse to a message class that is needed to process downstream. Suppose that the message class needs to contain some of the original information.

是否可以获得原始的 HttpRequest 来自 HttpResponse ？如果没有，有什么办法可以保留一些原始信息？

Is it possible to get the original HttpRequest from the HttpResponse? If not, is there any way to keep some of the original information?

推荐答案

一种方法是使用和自定义案例类，其中包含您要向下游传播的信息。例如：

One approach is to use a Future-based variant of the client API and a custom case class that holds the information you want to propagate downstream. For example:

case class Message(request: HttpRequest, response: HttpResponse)

source
  .map(toRequest)
  .mapAsync(parallelism = 3) { request => // adjust the level of parallelism as needed
    Http().singleRequest(request).map(response => Message(request, response))
  }
  // continue processing; at this point you have a Source[Message, _]

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