diff --git a/coprocess.go b/coprocess.go
index 9851acb1abc..81377c41ff2 100644
--- a/coprocess.go
+++ b/coprocess.go
@@ -324,12 +324,8 @@ func (m *CoProcessMiddleware) ProcessRequest(w http.ResponseWriter, r *http.Requ
 		for k, v := range returnObject.Metadata {
 			returnedSession.MetaData[k] = string(v)
 		}
-		if extractor == nil {
-			ctxSetSession(r, returnedSession, sessionID, true)
-		} else {
-			// The CP middleware did setup a session, we should pass it to the ID extractor (caching):
-			extractor.PostProcess(r, returnedSession, sessionID)
-		}
+
+		ctxSetSession(r, returnedSession, sessionID, true)
 	}
 
 	return nil, 200
diff --git a/coprocess_id_extractor.go b/coprocess_id_extractor.go
index 225a20d0706..0a118aed013 100644
--- a/coprocess_id_extractor.go
+++ b/coprocess_id_extractor.go
@@ -15,13 +15,11 @@ import (
 
 	"github.com/TykTechnologies/tyk/apidef"
 	"github.com/TykTechnologies/tyk/regexp"
-	"github.com/TykTechnologies/tyk/user"
 )
 
 // IdExtractor is the base interface for an ID extractor.
 type IdExtractor interface {
 	ExtractAndCheck(*http.Request) (string, ReturnOverrides)
-	PostProcess(*http.Request, *user.SessionState, string)
 	GenerateSessionID(string, BaseMiddleware) string
 }
 
@@ -40,11 +38,6 @@ func (e *BaseExtractor) ExtractAndCheck(r *http.Request) (sessionID string, retu
 	return "", ReturnOverrides{ResponseCode: 403, ResponseError: "Key not authorised"}
 }
 
-// PostProcess sets context variables and updates the storage.
-func (e *BaseExtractor) PostProcess(r *http.Request, session *user.SessionState, sessionID string) {
-	ctxSetSession(r, session, sessionID, true)
-}
-
 // ExtractHeader is used when a HeaderSource is specified.
 func (e *BaseExtractor) ExtractHeader(r *http.Request) (headerValue string, err error) {
 	headerName := e.Config.ExtractorConfig["header_name"].(string)
@@ -146,7 +139,7 @@ func (e *ValueExtractor) ExtractAndCheck(r *http.Request) (sessionID string, ret
 
 	if keyExists {
 		if previousSession.IdExtractorDeadline > time.Now().Unix() {
-			e.PostProcess(r, &previousSession, sessionID)
+			ctxSetSession(r, &previousSession, sessionID, true)
 			returnOverrides = ReturnOverrides{
 				ResponseCode: 200,
 			}
@@ -219,7 +212,7 @@ func (e *RegexExtractor) ExtractAndCheck(r *http.Request) (SessionID string, ret
 
 	if keyExists {
 		if previousSession.IdExtractorDeadline > time.Now().Unix() {
-			e.PostProcess(r, &previousSession, SessionID)
+			ctxSetSession(r, &previousSession, SessionID, true)
 			returnOverrides = ReturnOverrides{
 				ResponseCode: 200,
 			}
@@ -294,7 +287,7 @@ func (e *XPathExtractor) ExtractAndCheck(r *http.Request) (SessionID string, ret
 	previousSession, keyExists := e.BaseMid.CheckSessionAndIdentityForValidKey(SessionID, r)
 	if keyExists {
 		if previousSession.IdExtractorDeadline > time.Now().Unix() {
-			e.PostProcess(r, &previousSession, SessionID)
+			ctxSetSession(r, &previousSession, SessionID, true)
 			returnOverrides = ReturnOverrides{
 				ResponseCode: 200,
 			}