[networking] Ensure underlying file object is closed when fully read (#14935)

Fixes https://github.com/yt-dlp/yt-dlp/issues/14891

Authored by: coletdjnz

yt_dlp/networking/_urllib.py

@@ -306,7 +306,25 @@ class UrllibResponseAdapter(Response):
 
     def read(self, amt=None):
         try:
-            return self.fp.read(amt)
+            data = self.fp.read(amt)
+            underlying = getattr(self.fp, 'fp', None)
+            if isinstance(self.fp, http.client.HTTPResponse) and underlying is None:
+                # http.client.HTTPResponse automatically closes itself when fully read
+                self.close()
+            elif isinstance(self.fp, urllib.response.addinfourl) and underlying is not None:
+                # urllib's addinfourl does not close the underlying fp automatically when fully read
+                if isinstance(underlying, io.BytesIO):
+                    # data URLs or in-memory responses (e.g. gzip/deflate/brotli decoded)
+                    if underlying.tell() >= len(underlying.getbuffer()):
+                        self.close()
+                elif isinstance(underlying, io.BufferedReader) and amt is None:
+                    # file URLs.
+                    # XXX: this will not mark the response as closed if it was fully read with amt.
+                    self.close()
+            elif underlying is not None and underlying.closed:
+                # Catch-all for any cases where underlying file is closed
+                self.close()
+            return data
         except Exception as e:
             handle_response_read_exceptions(e)
             raise e