Fix Universal Group Player producing no audio on some members (#4116)

# What does this implement/fix?

<!-- Quick description and explanation of changes. -->

When playing to a Universal Group, members that can't use chunked
streaming (e.g. Squeezelite, some older Chromecast firmware) got no
sound. Universal groups always streamed using chunked encoding to every
member, regardless of each member's own configured streaming style so
any member that couldn't handle chunked failed silently, and the whole
group then stopped after a few seconds.

Each member already fetches the audio over its own connection, so the
streaming style can safely differ per member. We now pick it from each
member's own player settings — the same one it uses for normal
(non-group) playback — instead of forcing chunked on everyone. We also
guard against the specific crash that left HTTP/1.0 members silent.

**Related issue (if applicable):**

- related issue music-assistant/support#5214

## Types of changes

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Tick exactly one box. CI (.github/workflows/pr-labels.yaml) derives
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- [X] Bugfix (non-breaking change which fixes an issue) — `bugfix`
- [ ] New feature (non-breaking change which adds functionality) —
`new-feature`
- [ ] Enhancement to an existing feature — `enhancement`
- [ ] New music/player/metadata/plugin provider — `new-provider`
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected) — `breaking-change`
- [ ] Refactor (no behaviour change) — `refactor`
- [ ] Documentation only — `documentation`
- [ ] Maintenance / chore — `maintenance`
- [ ] CI / workflow change — `ci`
- [ ] Dependencies bump — `dependencies`

## Checklist

- [X] The code change is tested and works locally.
- [X] `pre-commit run --all-files` passes.
- [X] `pytest` passes, and tests have been added/updated under `tests/`
where applicable.
- [ ] For changes to shared models, the companion PR in
`music-assistant/models` is linked.
- [ ] For changes affecting the UI, the companion PR in
`music-assistant/frontend` is linked.
- [X] I have read and complied with the project's [AI
Policy](https://github.com/music-assistant/.github/blob/main/AI_POLICY.md)
for any AI-assisted contributions.
- [ ] I have raised a PR against the documentation repository targeting
the main or beta branch as appropriate.

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Marcel van der Veldt <m.vanderveldt@outlook.com>

Author: 3 people

music_assistant/providers/universal_group/player.py

@@ -3,11 +3,12 @@
 from __future__ import annotations
 
 import asyncio
+import contextlib
 from copy import deepcopy
 from time import time
 from typing import TYPE_CHECKING, cast
 
-from aiohttp import web
+from aiohttp import HttpVersion11, web
 from music_assistant_models.config_entries import ConfigEntry, ConfigValueOption, ConfigValueType
 from music_assistant_models.constants import PLAYER_CONTROL_FAKE, PLAYER_CONTROL_NONE
 from music_assistant_models.enums import (
@@ -580,6 +581,21 @@ async def _serve_ugp_stream(self, request: web.Request) -> web.StreamResponse:
         }
         resp = web.StreamResponse(status=200, reason="OK", headers=headers)
         http_profile = cast("str", self.config.get_value(CONF_HTTP_PROFILE, "chunked"))
+        # prefer the child (protocol) player configuration
+        if child_player_id:
+            # player_id may be stale/invalid; fall back to the group profile
+            with contextlib.suppress(KeyError):
+                http_profile = await self.mass.config.get_player_config_value(
+                    child_player_id, CONF_HTTP_PROFILE, default=http_profile, return_type=str
+                )
+        if http_profile == "chunked" and request.version < HttpVersion11:
+            # chunked encoding is not allowed on HTTP/1.0; fall back to
+            # connection-close streaming to avoid raising in resp.prepare()
+            self.logger.debug(
+                "Disabling chunked encoding for UGP stream to HTTP/1.0 client %s",
+                child_player_id or request.remote,
+            )
+            http_profile = "no_content_length"
         if http_profile == "forced_content_length":
             # some clients (notably older Chromecast firmware) refuse to play unless
             # they see a Content-Length header up front