Hi all, I have the following code: ```override fu...

# ktor

[Hong Phuc]

Hi all, I have the following code:

override fun install(plugin: String, scope: HttpClient) {
            scope.receivePipeline.intercept(HttpReceivePipeline.Before) { call ->

                val cacheableResponse = CacheableResponse(call)

                println("This is ${cacheableResponse.headers}")
                proceedWith(cacheableResponse)
                }
            }
        }

how does the intercept function know that the parameter call is of type HttpResponse while the required type for the parameter in the lamdba is TSubject . Also how can a dev who would like to use the intercept function know that a HttpResponse can be supplied to the lamdba, and is the object supplied to the function by the framework at runtime? Thanks in advance

[Aleksei Tirman [JB]]

The actual type is the HttpResponse because the receivePipeline is of the HttpReceivePipeline type which has the following signature:

public class HttpReceivePipeline(
    override val developmentMode: Boolean = true
) : Pipeline<HttpResponse, Unit>(Before, State, After)

The first type parameter for the Pipeline is the TSubject and the type argument that is passed is HttpResponse .
The TSubject is the type of object supplied to the block as the parameter. The TContext is the type of the current receiver in the block.

[Hong Phuc]

I understand. Thanks @Aleksei Tirman [JB]