diff --git a/.idea/dictionaries/ericf.xml b/.idea/dictionaries/ericf.xml
index 801176da..bf5347e9 100644
--- a/.idea/dictionaries/ericf.xml
+++ b/.idea/dictionaries/ericf.xml
@@ -1812,6 +1812,7 @@
       <w>valnew</w>
       <w>vals</w>
       <w>valuedispatch</w>
+      <w>valueerror</w>
       <w>valuetext</w>
       <w>valuetype</w>
       <w>varargannotation</w>
diff --git a/assets/src/ba_data/python/ba/_assetmanager.py b/assets/src/ba_data/python/ba/_assetmanager.py
index 0d390621..18bbbcdb 100644
--- a/assets/src/ba_data/python/ba/_assetmanager.py
+++ b/assets/src/ba_data/python/ba/_assetmanager.py
@@ -162,9 +162,13 @@ class AssetGather:
 
 
 def fetch_url(url: str, filename: Path, asset_gather: AssetGather) -> None:
-    """Fetch a given url to a given filename."""
+    """Fetch a given url to a given filename for a given AssetGather.
+
+    """
+    # pylint: disable=too-many-locals
 
     import socket
+    import threading
 
     # We don't want to keep the provided AssetGather alive, but we want
     # to abort if it dies.
@@ -173,31 +177,41 @@ def fetch_url(url: str, filename: Path, asset_gather: AssetGather) -> None:
 
     # Pass a very short timeout to urllib so we have opportunities
     # to cancel even with network blockage.
-    ureq = urllib.request.urlopen(url, None, 1)
-    file_size = int(ureq.headers["Content-Length"])
-    print(f"\nDownloading: {filename} Bytes: {file_size:,}")
+    req = urllib.request.urlopen(url, timeout=1)
+    file_size = int(req.headers['Content-Length'])
+    print(f'\nDownloading: {filename} Bytes: {file_size:,}')
+
+    def doit() -> None:
+        time.sleep(1)
+        print('dir', type(req.fp), dir(req.fp))
+        print('WOULD DO IT', flush=True)
+        # req.close()
+        req.fp.close()
+
+    threading.Thread(target=doit).run()
 
     with open(filename, 'wb') as outfile:
         file_size_dl = 0
 
-        # I'm guessing we want this decently big so we're running fewer cycles
-        # of this loop during downloads and keeping our load lower. Our timeout
-        # should ensure a minimum rate for the loop and this will affect
-        # the maximum. Perhaps we should aim for a few cycles per second on
-        # an average connection?..
-        block_sz = 1024 * 1024
+        block_sz = 1024 * 1024 * 1000
         time_outs = 0
         while True:
             try:
-                data = ureq.read(block_sz)
+                data = req.read(block_sz)
+            except ValueError:
+                import traceback
+                traceback.print_exc()
+                print('VALUEERROR', flush=True)
+                break
             except socket.timeout:
+                print('TIMEOUT', flush=True)
                 # File has not had activity in max seconds.
                 if time_outs > 3:
-                    print("\n\n\nsorry -- try back later")
+                    print('\n\n\nsorry -- try back later')
                     os.unlink(filename)
                     raise
-                print("\nHmmm... little issue... "
-                      "I'll wait a couple of seconds")
+                print('\nHmmm... little issue... '
+                      'I\'ll wait a couple of seconds')
                 time.sleep(3)
                 time_outs += 1
                 continue
diff --git a/docs/ba_module.md b/docs/ba_module.md
index f373e133..c8fba124 100644
--- a/docs/ba_module.md
+++ b/docs/ba_module.md
@@ -1,5 +1,5 @@
 <!-- THIS FILE IS AUTO GENERATED; DO NOT EDIT BY HAND -->
-<!--DOCSHASH=0ccb27f0a14c6ad6f07acd13b8bd2fbb-->
+<!--DOCSHASH=266725d2f42aff8a96924a30416d8926-->
 <h4><em>last updated on 2020-03-12 for Ballistica version 1.5.0 build 20001</em></h4>
 <p>This page documents the Python classes and functions in the 'ba' module,
  which are the ones most relevant to modding in Ballistica. If you come across something you feel should be included here or could be better explained, please <a href="mailto:support@froemling.net">let me know</a>. Happy modding!</p>
diff --git a/tests/test_ba/test_assetmanager.py b/tests/test_ba/test_assetmanager.py
index d915ba28..d324d075 100644
--- a/tests/test_ba/test_assetmanager.py
+++ b/tests/test_ba/test_assetmanager.py
@@ -41,6 +41,7 @@ def test_assetmanager() -> None:
     """Testing."""
 
     with tempfile.TemporaryDirectory() as tmpdir:
+
         manager = AssetManager(rootdir=Path(tmpdir))
         wref = weakref.ref(manager)
         manager.start()
@@ -52,7 +53,7 @@ def test_assetmanager() -> None:
 
         manager.stop()
 
-        # Make sure nothing is keeping itself alive
+        # Make sure nothing is keeping itself alive.
         del manager
         del gather
         assert wref() is None