## Summary
This PR fixes GStreamer interoperability issues during WebRTC/WHEP
negotiation with ZLMediaServer.
GStreamer could fail to establish the connection for two separate
reasons:
1. ZLMediaServer generated a non-compliant ICE `ufrag`. The generated
value contained `_`, which is not a valid ICE character, so GStreamer
rejected the SDP.
2. ZLMediaServer did not correctly handle `bundle-only` offers and could
answer an accepted bundled m-line with `port=0`, which caused the later
WHEP negotiation to fail.
## Changes
- Generate ICE `ufrag` values using ICE-compliant characters only.
- Preserve and handle `a=bundle-only` correctly during SDP parsing and
answer generation.
- Return `port=9` instead of `port=0` for accepted bundled m-lines.
- Add regression coverage for `bundle-only` SDP handling.
- URL-encode `delete_webrtc` query parameters in the returned `Location`
header so ICE-safe identifiers remain round-trippable over HTTP.
## Validation
- Built with WebRTC and SCTP enabled.
- Added regression test: `test_webrtc_regression`
- Verified:
- ICE-safe identifier round-trip through `delete_webrtc`
- `bundle-only` SDP answer generation
解决在window mingw 5.3环境下编译出现如下报错信息
no known conversion from 'LONG (*)(EXCEPTION_POINTERS*) {aka long int
(*)(_EXCEPTION_POINTERS*)}' to 'LPTOP_LEVEL_EXCEPTION_FILTER {aka long
int (__attribute__((__stdcall__)) *)(_EXCEPTION_POINTERS*)}'
When performing a 302 redirect, if the server explicitly indicates that the connection is not a persistent connection, the current
connection should not be reused; this prevents potential failures caused
by certain servers actively closing the connection.
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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
