I looked more into this issue and found that to get the request to fully
render so I can append them into a multipart body, I needed to use internal
API, or at least, this is the only way I could figure it out quickly. You
just need to run the HttpRequests into the Flow defined below. The code
comes from OutgoingConnectionBlueprint.
package akka.http.impl.engine.client
import akka.http.impl.engine.rendering.HttpRequestRendererFactory
import akka.http.impl.engine.rendering.RequestRenderingContext
import akka.stream.scaladsl.Flow
import akka.http.scaladsl.model.HttpRequest
import akka.util.ByteString
import mscrm._
import akka.event._
import akka.http.scaladsl.model.headers._
import concurrent.ExecutionContext
import akka.stream._
import akka.actor._
object RequestRenderer {
def renderRequestFlow(hostname: String)(implicit ec: ExecutionContext,
mat: Materializer, as: ActorSystem) = {
val log = Logging.getLogger(implicitly[ActorSystem], this)
val hostHeader = Host(hostname)
val requestRendererFactory = new HttpRequestRendererFactory(None, 128,
log)
val requestRendering: Flow[HttpRequest, ByteString, Unit] =
Flow[HttpRequest]
.map(RequestRenderingContext(_, hostHeader))
.via(Flow[RequestRenderingContext].flatMapConcat(requestRendererFactory.renderToSource).named("renderer"))
requestRendering
}
}
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