update FS Handler

Previously the FS handler would interpret a 500 status as a 404
in the adapter layer by checking if the response body contained
the text  or is the response status
was 500 and then throw an error code for 404.

ui/app/adapters/allocation.js

@@ -31,14 +31,8 @@ async function handleFSResponse(response) {
   } else {
     const body = await response.text();
 
-    // TODO update this if/when endpoint returns 404 as expected
-    const statusIs500 = response.status === 500;
-    const bodyIncludes404Text = body.includes('no such file or directory');
-
-    const translatedCode = statusIs500 && bodyIncludes404Text ? 404 : response.status;
-
     throw {
-      code: translatedCode,
+      code: response.status,
       toString: () => body,
     };
   }

ui/tests/acceptance/behaviors/fs.js

@@ -361,7 +361,8 @@ export default function browseFilesystem({
       ...visitSegments({ allocation: this.allocation, task: this.task }),
       path: '/what-is-this',
     });
-    assert.equal(FS.error.title, 'Not Found', '500 is interpreted as 404');
+    assert.notEqual(FS.error.title, 'Not Found', '500 is not interpreted as 404');
+    assert.equal(FS.error.title, 'Server Error', '500 is not interpreted as 500');
 
     await visit('/');