Fix #2155: Streaming gzipped responses

Author: ReadingNought

PR_BODY.md

@@ -0,0 +1,16 @@
+## Summary
+Enable automatic content decoding on `Response.raw` so streamed gzip-encoded responses can be consumed directly via file-like readers.
+
+## Root Cause
+Requests built responses with `raw.decode_content=False`, so consumers reading from `response.raw` got compressed bytes by default. This breaks file-like streaming parsers that call `.read()` and expect decoded content.
+
+## Changes Made
+- Set `response.raw.decode_content = True` in `HTTPAdapter.build_response`.
+- Added a regression test in `tests/test_adapters.py` to verify `build_response` enables decoded raw reads by default.
+
+## Verification
+- Ran: `PYTHONPATH=src pytest -q tests/test_adapters.py`
+- Result: `2 passed`
+
+## Notes
+- Explicit reads that need wire-level compressed bytes can still request `decode_content=False` on read/stream calls.

src/requests/adapters.py

@@ -356,6 +356,7 @@ def build_response(self, req, resp):
         # Set encoding.
         response.encoding = get_encoding_from_headers(response.headers)
         response.raw = resp
+        response.raw.decode_content = True
         response.reason = response.raw.reason
 
         if isinstance(req.url, bytes):

tests/test_adapters.py

@@ -1,3 +1,4 @@
+import requests
 import requests.adapters
 
 
@@ -6,3 +7,17 @@ def test_request_url_trims_leading_path_separators():
     a = requests.adapters.HTTPAdapter()
     p = requests.Request(method="GET", url="http://127.0.0.1:10000//v:h").prepare()
     assert "/v:h" == a.request_url(p, {})
+
+
+def test_build_response_sets_decode_content():
+    adapter = requests.adapters.HTTPAdapter()
+    req = requests.Request(method="GET", url="http://example.com/").prepare()
+    raw_resp = type(
+        "RawResponse",
+        (),
+        {"status": 200, "headers": {}, "reason": "OK", "decode_content": False},
+    )()
+
+    response = adapter.build_response(req, raw_resp)
+
+    assert response.raw.decode_content is True