diff --git a/boards/forms/__init__.py b/boards/forms/__init__.py
--- a/boards/forms/__init__.py
+++ b/boards/forms/__init__.py
@@ -2,6 +2,7 @@ import hashlib
 import logging
 import re
 import time
+import traceback
 
 import pytz
 from django import forms
diff --git a/boards/models/attachment/downloaders.py b/boards/models/attachment/downloaders.py
--- a/boards/models/attachment/downloaders.py
+++ b/boards/models/attachment/downloaders.py
@@ -41,20 +41,20 @@ class Downloader:
         # Get the actual content into memory
         response = requests.get(url, verify=False, stream=True)
 
-        # Download file, stop if the size exceeds limit
-        size = 0
-
-        # Set a dummy file name that will be replaced
-        # anyway, just keep the valid extension
-        filename = 'file.' + content_type.split('/')[1]
+        if response.status_code == HTTP_RESULT_OK:
+            # Download file, stop if the size exceeds limit
+            size = 0
 
-        file = TemporaryUploadedFile(filename, content_type, 0, None, None)
-        for chunk in response.iter_content(FILE_DOWNLOAD_CHUNK_BYTES):
-            size += len(chunk)
-            validate_file_size(size)
-            file.write(chunk)
+            # Set a dummy file name that will be replaced
+            # anyway, just keep the valid extension
+            filename = 'file.' + content_type.split('/')[1]
 
-        if response.status_code == HTTP_RESULT_OK:
+            file = TemporaryUploadedFile(filename, content_type, 0, None, None)
+            for chunk in response.iter_content(FILE_DOWNLOAD_CHUNK_BYTES):
+                size += len(chunk)
+                validate_file_size(size)
+                file.write(chunk)
+
             return file
 
 
@@ -85,12 +85,15 @@ class YouTubeDownloader(Downloader):
 class NothingDownloader(Downloader):
     @staticmethod
     def handles(url: str) -> bool:
-        if REGEX_MAGNET.match(url) or REGEX_YOUTUBE_URL.match(url):
+        if REGEX_MAGNET.match(url):
             return True
 
         response_head = requests.head(url, verify=False)
-        content_type = response_head.headers[HEADER_CONTENT_TYPE].split(';')[0]
-        return content_type in TYPE_URL_ONLY
+        if response_head.status_code == HTTP_RESULT_OK:
+            content_type = response_head.headers[HEADER_CONTENT_TYPE].split(';')[0]
+            return content_type in TYPE_URL_ONLY
+        else:
+            return True
 
     @staticmethod
     def download(url: str):