diff --git a/swh/loader/git/dumb.py b/swh/loader/git/dumb.py
--- a/swh/loader/git/dumb.py
+++ b/swh/loader/git/dumb.py
@@ -41,7 +41,10 @@
     """
     if not repo_url.startswith("http"):
         return False
-    url = urllib.parse.urljoin(repo_url, "info/refs?service=git-upload-pack/")
+    url = urllib.parse.urljoin(
+        repo_url.rstrip("/") + "/", "info/refs?service=git-upload-pack/"
+    )
+    logger.debug("Fetching %s", url)
     response = requests.get(url, headers=HEADERS)
     content_type = response.headers.get("Content-Type")
     return (
@@ -113,7 +116,8 @@
         return map(self._get_git_object, self.objects[object_type])
 
     def _http_get(self, path: str) -> SpooledTemporaryFile:
-        url = urllib.parse.urljoin(self.repo_url, path)
+        url = urllib.parse.urljoin(self.repo_url.rstrip("/") + "/", path)
+        logger.debug("Fetching %s", url)
         response = self._session.get(url, headers=HEADERS)
         buffer = SpooledTemporaryFile(max_size=100 * 1024 * 1024)
         for chunk in response.iter_content(chunk_size=10 * 1024 * 1024):
diff --git a/swh/loader/git/tests/test_loader.py b/swh/loader/git/tests/test_loader.py
--- a/swh/loader/git/tests/test_loader.py
+++ b/swh/loader/git/tests/test_loader.py
@@ -158,18 +158,22 @@
         if with_pack_files:
             # create a bare clone of that repository in another folder,
             # all objects will be contained in one or two pack files in that case
-            bare_repo_path = os.path.join(tmp_path, archive_name + "_bare")
+            http_root_dir = tmp_path
+            repo_name = archive_name + "_bare"
+            bare_repo_path = os.path.join(http_root_dir, repo_name)
             subprocess.run(
                 ["git", "clone", "--bare", base_repo_url, bare_repo_path], check=True,
             )
         else:
             # otherwise serve objects from the bare repository located in
             # the .git folder of the base repository
-            bare_repo_path = os.path.join(destination_path, ".git")
+            http_root_dir = destination_path
+            repo_name = ".git"
+            bare_repo_path = os.path.join(http_root_dir, repo_name)
 
         # spawn local HTTP server that will serve the bare repository files
         hostname = "localhost"
-        handler = partial(SimpleHTTPRequestHandler, directory=bare_repo_path)
+        handler = partial(SimpleHTTPRequestHandler, directory=http_root_dir)
         httpd = HTTPServer((hostname, 0), handler, bind_and_activate=True)
 
         def serve_forever(httpd):
@@ -213,7 +217,7 @@
                 return super().load()
 
         # bare repository with dumb protocol only URL
-        self.repo_url = f"http://{httpd.server_name}:{httpd.server_port}"
+        self.repo_url = f"http://{httpd.server_name}:{httpd.server_port}/{repo_name}"
         self.loader = DumbGitLoaderTest(swh_storage, self.repo_url)
         self.repo = repo