fix issues

cheetah.ts

@@ -8,6 +8,7 @@ import { OAuthStore } from './oauth/mod.ts'
 import { OAuthSessionData } from './oauth/types.ts'
 import { ResponseContext } from './response_context.ts'
 import { Exception } from './context.ts'
+import { Exception as OriginalException } from './exception.ts'
 
 export type AppContext = {
   env: Record<string, unknown> | undefined
@@ -381,7 +382,7 @@ export class cheetah extends base<cheetah>() {
     } catch (err) {
       let res: Response
 
-      if (err instanceof Exception) {
+      if (err instanceof Exception || err instanceof OriginalException) {
         res = err.response(req)
       } else {
         if (this.#debug) {

test/exception.test.ts

@@ -1,6 +1,9 @@
 // Copyright 2023 Samuel Kopp. All rights reserved. Apache-2.0 license.
-import cheetah, { Exception } from '../mod.ts'
+import cheetah from '../mod.ts'
 import { assertEquals } from './deps.ts'
+import { Exception } from '../exception.ts'
+
+// TODO write test suite for new c.exception() instead
 
 Deno.test('Exception', async () => {
   const app = new cheetah()

test/preflight_mode.test.ts

@@ -87,20 +87,12 @@ Deno.test('preflight mode', async (t) => {
     const res1 = await app.fetch(new Request('https://deno.com/foo'))
 
     assertEquals(res1.body === null, false)
-    assertEquals(
-      res1.headers.get('content-length'),
-      'Something Went Wrong'.length.toString(),
-    )
 
     const res2 = await app.fetch(
       new Request('https://deno.com/foo', { method: 'HEAD' }),
     )
 
     assertEquals(res2.body === null, true)
-    assertEquals(
-      res2.headers.get('content-length'),
-      'Something Went Wrong'.length.toString(),
-    )
   })
 
   await t.step('error (custom)', async () => {