Update bin/http_test_server

Co-authored-by: Tim Düsterhus <timwolla@googlemail.com>

Author: dbu

bin/http_test_server

@@ -10,6 +10,7 @@ elif [ -f "$DIR/../vendor/autoload.php" ]; then
     php -S 127.0.0.1:10000 -t "$DIR/../fixture"
 # Not working, e.g. windows which does not do symlinks
 else
-    echo "*** Can't find the fixture folder ***"
-    echo "Please write your own way to start a PHP web server on port 10000 for the 'fixture' directory."
+    echo "*** Can't find the fixture folder ***" >&2
+    echo "Please write your own way to start a PHP web server on port 10000 for the 'fixture' directory." >&2
+    exit 1
 fi