fix requests auto decode file

pyproject.toml

@@ -61,6 +61,7 @@ xattr = { version = "^0.10.0", markers = "sys_platform == 'darwin'" }
 
 [tool.poetry.group.dev.dependencies]
 pre-commit = ">=2.10"
+pytest-httpserver = "^1.0.8"
 
 [tool.poetry.group.test.dependencies]
 deepdiff = "^6.3"

src/poetry/utils/helpers.py

@@ -154,7 +154,7 @@ def total_size(self) -> int:
     def download_with_progress(self, chunk_size: int = 1024) -> Iterator[int]:
         fetched_size = 0
         with atomic_open(self._dest) as f:
-            for chunk in self._response.iter_content(chunk_size=chunk_size):
+            for chunk in self._response.raw.stream(chunk_size, decode_content=False):
                 if chunk:
                     f.write(chunk)
                     fetched_size += len(chunk)

tests/utils/test_helpers.py

@@ -1,12 +1,14 @@
 from __future__ import annotations
+import pathlib
 
 from typing import TYPE_CHECKING
 
 import pytest
+from pytest_httpserver import HTTPServer
 
 from poetry.core.utils.helpers import parse_requires
 
-from poetry.utils.helpers import get_file_hash
+from poetry.utils.helpers import get_file_hash, download_file
 
 
 if TYPE_CHECKING:
@@ -119,3 +121,17 @@ def test_guaranteed_hash(
 ) -> None:
     file_path = fixture_dir("distributions") / "demo-0.1.0.tar.gz"
     assert get_file_hash(file_path, hash_name) == expected
+
+
+def test_download_file(httpserver: HTTPServer, fixture_dir: FixtureDirGetter, tmp_path: pathlib.Path) -> None:
+    file_path = fixture_dir("distributions") / "demo-0.1.0.tar.gz"
+    httpserver.expect_request("/demo-0.1.0.tar.gz").respond_with_data(
+        open(file_path, "rb").read(),
+        headers={'Content-Encoding': 'gzip'}
+    )
+    dest = tmp_path / "demo-0.1.0.tar.gz"
+    download_file(httpserver.url_for("/demo-0.1.0.tar.gz"), dest)
+    expect_sha_256 = "9fa123ad707a5c6c944743bf3e11a0e80d86cb518d3cf25320866ca3ef43e2ad"
+    assert get_file_hash(dest) == expect_sha_256
+
+