Make _http_exists send the ranged GET its docstring describes

The docstring states the requirement exactly: a ranged GET, so that servers
which ignore HEAD still work. The body calls make_head_request, which is
requests.head.

Two consequences. The Range header is meaningless on a HEAD, so the 206 the
function tests for is never observed on that path. And requests.head defaults
to allow_redirects=False, so a 302 also reads as missing.

That combination takes out the HuggingFace lane entirely: huggingface.py
accepts only .bin, every real .bin weight is Git-LFS backed, and HF serves
those from a CDN via a 302.

Signed-off-by: Arpit Jain <arpitjain099@gmail.com>

Author: arpitjain099

src/fetchcode/utils.py

@@ -250,7 +250,14 @@ def _http_exists(url: str) -> bool:
     Lightweight existence check using a ranged GET so CDNs/servers that ignore HEAD still work.
     """
     try:
-        resp = make_head_request(url, headers={"Range": "bytes=0-0"})
-        return resp is not None and resp.status_code in (200, 206)
+        # A ranged GET rather than a HEAD, as the docstring says: HEAD ignores the
+        # Range header so 206 is never observed on that path, and requests.head
+        # does not follow redirects, so a CDN 302 reads as "missing". Git-LFS
+        # backed files are served exactly that way.
+        resp = requests.get(url, headers={"Range": "bytes=0-0"}, allow_redirects=True, stream=True)
+        try:
+            return resp.status_code in (200, 206)
+        finally:
+            resp.close()
     except Exception:
         return False