diff --git a/errors/errors.go b/errors/errors.go
index 40974b1..6bcb9ce 100644
--- a/errors/errors.go
+++ b/errors/errors.go
@@ -1,15 +1,15 @@
 package errors
 
 import (
-	"git.grassecon.net/grassrootseconomics/visedriver/internal/handlers"
+	"errors"
 )
 
 var (
-	ErrInvalidRequest = handlers.ErrInvalidRequest
-	ErrSessionMissing = handlers.ErrSessionMissing
-	ErrInvalidInput = handlers.ErrInvalidInput
-	ErrStorage = handlers.ErrStorage
-	ErrEngineType = handlers.ErrEngineType
-	ErrEngineInit = handlers.ErrEngineInit
-	ErrEngineExec = handlers.ErrEngineExec
+	ErrInvalidRequest = errors.New("invalid request for context")
+	ErrSessionMissing = errors.New("missing session")
+	ErrInvalidInput   = errors.New("invalid input")
+	ErrStorage        = errors.New("storage retrieval fail")
+	ErrEngineType     = errors.New("incompatible engine")
+	ErrEngineInit     = errors.New("engine init fail")
+	ErrEngineExec     = errors.New("engine exec fail")
 )
diff --git a/internal/handlers/single.go b/internal/handlers/single.go
deleted file mode 100644
index 6ce7081..0000000
--- a/internal/handlers/single.go
+++ /dev/null
@@ -1,54 +0,0 @@
-package handlers
-
-import (
-	"context"
-	"errors"
-	"io"
-
-	"git.defalsify.org/vise.git/engine"
-	"git.defalsify.org/vise.git/logging"
-	"git.defalsify.org/vise.git/persist"
-	"git.defalsify.org/vise.git/resource"
-
-	"git.grassecon.net/grassrootseconomics/visedriver/storage"
-)
-
-var (
-	logg = logging.NewVanilla().WithDomain("handlers")
-)
-
-var (
-	ErrInvalidRequest = errors.New("invalid request for context")
-	ErrSessionMissing = errors.New("missing session")
-	ErrInvalidInput   = errors.New("invalid input")
-	ErrStorage        = errors.New("storage retrieval fail")
-	ErrEngineType     = errors.New("incompatible engine")
-	ErrEngineInit     = errors.New("engine init fail")
-	ErrEngineExec     = errors.New("engine exec fail")
-)
-
-type RequestSession struct {
-	Ctx      context.Context
-	Config   engine.Config
-	Engine   engine.Engine
-	Input    []byte
-	Storage  *storage.Storage
-	Writer   io.Writer
-	Continue bool
-}
-
-// TODO: seems like can remove this.
-type RequestParser interface {
-	GetSessionId(context context.Context, rq any) (string, error)
-	GetInput(rq any) ([]byte, error)
-}
-
-type RequestHandler interface {
-	GetConfig() engine.Config
-	GetRequestParser() RequestParser
-	GetEngine(cfg engine.Config, rs resource.Resource, pe *persist.Persister) engine.Engine
-	Process(rs RequestSession) (RequestSession, error)
-	Output(rs RequestSession) (RequestSession, error)
-	Reset(rs RequestSession) (RequestSession, error)
-	Shutdown()
-}
diff --git a/session/http/parse.go b/session/http/parse.go
index c942242..83cbf77 100644
--- a/session/http/parse.go
+++ b/session/http/parse.go
@@ -5,7 +5,7 @@ import (
 	"io/ioutil"
 	"net/http"
 
-	"git.grassecon.net/grassrootseconomics/visedriver/internal/handlers"
+	"git.grassecon.net/grassrootseconomics/visedriver/errors"
 )
 
 type DefaultRequestParser struct {
@@ -14,11 +14,11 @@ type DefaultRequestParser struct {
 func (rp *DefaultRequestParser) GetSessionId(ctx context.Context, rq any) (string, error) {
 	rqv, ok := rq.(*http.Request)
 	if !ok {
-		return "", handlers.ErrInvalidRequest
+		return "", errors.ErrInvalidRequest
 	}
 	v := rqv.Header.Get("X-Vise-Session")
 	if v == "" {
-		return "", handlers.ErrSessionMissing
+		return "", errors.ErrSessionMissing
 	}
 	return v, nil
 }
@@ -26,7 +26,7 @@ func (rp *DefaultRequestParser) GetSessionId(ctx context.Context, rq any) (strin
 func (rp *DefaultRequestParser) GetInput(rq any) ([]byte, error) {
 	rqv, ok := rq.(*http.Request)
 	if !ok {
-		return nil, handlers.ErrInvalidRequest
+		return nil, errors.ErrInvalidRequest
 	}
 	defer rqv.Body.Close()
 	v, err := ioutil.ReadAll(rqv.Body)
diff --git a/session/http/server_test.go b/session/http/server_test.go
index e2b3c49..2987c24 100644
--- a/session/http/server_test.go
+++ b/session/http/server_test.go
@@ -9,7 +9,7 @@ import (
 	"testing"
 
 	"git.defalsify.org/vise.git/engine"
-	"git.grassecon.net/grassrootseconomics/visedriver/internal/handlers"
+	viseerrors "git.grassecon.net/grassrootseconomics/visedriver/errors"
 	"git.grassecon.net/grassrootseconomics/visedriver/testutil/mocks/httpmocks"
 	"git.grassecon.net/grassrootseconomics/visedriver/request"
 )
@@ -44,14 +44,14 @@ func TestSessionHandler_ServeHTTP(t *testing.T) {
 		{
 			name:           "Missing Session ID",
 			sessionID:      "",
-			parserErr:      handlers.ErrSessionMissing,
+			parserErr:      viseerrors.ErrSessionMissing,
 			expectedStatus: http.StatusBadRequest,
 		},
 		{
 			name:           "Process Error",
 			sessionID:      "123",
 			input:          []byte("test input"),
-			processErr:     handlers.ErrStorage,
+			processErr:     viseerrors.ErrStorage,
 			expectedStatus: http.StatusInternalServerError,
 		},
 		{
@@ -151,13 +151,13 @@ func TestDefaultRequestParser_GetSessionId(t *testing.T) {
 			name:          "Missing Session ID",
 			request:       httptest.NewRequest(http.MethodPost, "/", nil),
 			expectedID:    "",
-			expectedError: handlers.ErrSessionMissing,
+			expectedError: viseerrors.ErrSessionMissing,
 		},
 		{
 			name:          "Invalid Request Type",
 			request:       invalidRequestType{},
 			expectedID:    "",
-			expectedError: handlers.ErrInvalidRequest,
+			expectedError: viseerrors.ErrInvalidRequest,
 		},
 	}
 
@@ -203,7 +203,7 @@ func TestDefaultRequestParser_GetInput(t *testing.T) {
 			name:          "Invalid Request Type",
 			request:       invalidRequestType{},
 			expectedInput: nil,
-			expectedError: handlers.ErrInvalidRequest,
+			expectedError: viseerrors.ErrInvalidRequest,
 		},
 		{
 			name: "Read Error",