X-Git-Url: http://source.bookstackapp.com/bookstack/blobdiff_plain/59d1fb2d1033616ac7edc143f4876485bb997c6a..refs/pull/3433/head:/app/Http/Controllers/Controller.php

diff --git a/app/Http/Controllers/Controller.php b/app/Http/Controllers/Controller.php
index 6ca2239cc..5b2221fc1 100644
--- a/app/Http/Controllers/Controller.php
+++ b/app/Http/Controllers/Controller.php
@@ -126,10 +126,12 @@ abstract class Controller extends BaseController
      */
     protected function streamedDownloadResponse($stream, string $fileName): StreamedResponse
     {
-        return response()->stream(function() use ($stream) {
-            // End & flush the output buffer otherwise we still seem to use memory.
+        return response()->stream(function () use ($stream) {
+
+            // End & flush the output buffer, if we're in one, otherwise we still use memory.
+            // Output buffer may or may not exist depending on PHP `output_buffering` setting.
             // Ignore in testing since output buffers are used to gather a response.
-            if (!app()->runningUnitTests()) {
+            if (!empty(ob_get_status()) && !app()->runningUnitTests()) {
                 ob_end_clean();
             }
 
@@ -167,10 +169,10 @@ abstract class Controller extends BaseController
         $sniffContent = fread($stream, 1000);
         $mime = (new WebSafeMimeSniffer())->sniff($sniffContent);
 
-        return response()->stream(function() use ($sniffContent, $stream) {
-           echo $sniffContent;
-           fpassthru($stream);
-           fclose($stream);
+        return response()->stream(function () use ($sniffContent, $stream) {
+            echo $sniffContent;
+            fpassthru($stream);
+            fclose($stream);
         }, 200, [
             'Content-Type'           => $mime,
             'Content-Disposition'    => 'inline; filename="' . str_replace('"', '', $fileName) . '"',