docs: Updates sample code for Advanced Network Configuration document…

…ation (apollographql#3223)

docs/source/networking/request-pipeline.mdx

@@ -294,14 +294,16 @@ The following example snippets demonstrate how to use an advanced request pipeli
 This example interceptor checks whether the active user is logged in. If so, it asynchronously renews that user's access token if it's expired. Finally, it adds the access token to an `Authorization` header before proceeding to the next interceptor in the request chain.
 
 ```swift
+import Foundation
 import Apollo
 
 class UserManagementInterceptor: ApolloInterceptor {
-
   enum UserError: Error {
     case noUserLoggedIn
   }
 
+  public var id: String = UUID().uuidString
+
   /// Helper function to add the token then move on to the next step
   private func addTokenAndProceed<Operation: GraphQLOperation>(
     _ token: Token,
@@ -311,9 +313,12 @@ class UserManagementInterceptor: ApolloInterceptor {
     completion: @escaping (Result<GraphQLResult<Operation.Data>, Error>) -> Void
   ) {
     request.addHeader(name: "Authorization", value: "Bearer \(token.value)")
-    chain.proceedAsync(request: request,
-                        response: response,
-                        completion: completion)
+    chain.proceedAsync(
+      request: request,
+      response: response,
+      interceptor: self,
+      completion: completion
+    )
   }
 
   func interceptAsync<Operation: GraphQLOperation>(
@@ -384,10 +389,13 @@ class UserManagementInterceptor: ApolloInterceptor {
 This example interceptor logs the outgoing request using the hypothetical `Logger` class, then proceeds to the next interceptor in the request chain:
 
 ```swift
+import Foundation
 import Apollo
 
 class RequestLoggingInterceptor: ApolloInterceptor {
 
+  public var id: String = UUID().uuidString
+
   func interceptAsync<Operation: GraphQLOperation>(
     chain: RequestChain,
     request: HTTPRequest<Operation>,
@@ -398,6 +406,7 @@ class RequestLoggingInterceptor: ApolloInterceptor {
     chain.proceedAsync(
       request: request,
       response: response,
+      interceptor: self,
       completion: completion
     )
   }
@@ -411,6 +420,7 @@ This example interceptor uses the hypothetical `Logger` class to log the request
 This is an example of an interceptor that can both proceed _and_ throw an error. We don't necessarily want to stop processing if this interceptor was added in wrong place, but we _do_ want to know about that error.
 
 ```swift
+import Foundation
 import Apollo
 
 class ResponseLoggingInterceptor: ApolloInterceptor {
@@ -419,6 +429,8 @@ class ResponseLoggingInterceptor: ApolloInterceptor {
     case notYetReceived
   }
 
+  public var id: String = UUID().uuidString
+
   func interceptAsync<Operation: GraphQLOperation>(
     chain: RequestChain,
     request: HTTPRequest<Operation>,
@@ -430,6 +442,7 @@ class ResponseLoggingInterceptor: ApolloInterceptor {
       chain.proceedAsync(
         request: request,
         response: response,
+        interceptor: self,
         completion: completion
       )
     }