WebRTC ICE 连接在 safari 和 firefox 之间使用 Angular 失败，即使收集了候选冰

Question

从 Firefox 61.0.1 调用到 Safari 11.1.2 会导致在 Angular 5.x 应用程序中收集所有候选人后，ICE 连接失败。

该应用正在使用 webrtc-adapter 添加跨浏览器支持。

经过测试的浏览器：

• 火狐 61.0.1
• 歌剧 54
• Safari 11.1.2 + 移动版 Safari
• 铬 67
• 边缘 42

平台：macOS High Sierra 10.13.6

所有其他浏览器组合都有效。

这是来自 firefox 的 webrtc 日志：

insert 'ice' (registry) succeeded: ice

insert 'ice.pref' (registry) succeeded: ice.pref

insert 'ice.pref.type' (registry) succeeded: ice.pref.type

insert 'ice.pref.type.srv_rflx' (UCHAR) succeeded: 0x64

insert 'ice.pref.type.peer_rflx' (UCHAR) succeeded: 0x6e

insert 'ice.pref.type.host' (UCHAR) succeeded: 0x7e

insert 'ice.pref.type.relayed' (UCHAR) succeeded: 0x05

insert 'ice.pref.type.srv_rflx_tcp' (UCHAR) succeeded: 0x63

insert 'ice.pref.type.peer_rflx_tcp' (UCHAR) succeeded: 0x6d

insert 'ice.pref.type.host_tcp' (UCHAR) succeeded: 0x7d

insert 'ice.pref.type.relayed_tcp' (UCHAR) succeeded: 0x00

insert 'stun' (registry) succeeded: stun

insert 'stun.client' (registry) succeeded: stun.client

insert 'stun.client.maximum_transmits' (UINT4) succeeded: 7

insert 'ice.trickle_grace_period' (UINT4) succeeded: 5000

insert 'ice.tcp' (registry) succeeded: ice.tcp

insert 'ice.tcp.so_sock_count' (INT4) succeeded: 0

insert 'ice.tcp.listen_backlog' (INT4) succeeded: 10

insert 'ice.tcp.disable' (char) succeeded: \000

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:617 function nr_socket_multi_tcp_listen failed with error 3

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): failed to create passive TCP host candidate: 3

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:617 function nr_socket_multi_tcp_listen failed with error 3

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): failed to create passive TCP host candidate: 3

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:617 function nr_socket_multi_tcp_listen failed with error 3

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): failed to create passive TCP host candidate: 3

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:617 function nr_socket_multi_tcp_listen failed with error 3

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): failed to create passive TCP host candidate: 3

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:617 function nr_socket_multi_tcp_listen failed with error 3

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): failed to create passive TCP host candidate: 3

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) has no stream matching stream 0-1531925753097790 (id=25769803783 url=http://localhost:4242/call/1 aLevel=1

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) has no stream matching stream 0-1531925753097790 (id=25769803783 url=http://localhost:4242/call/1 aLevel=2

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) no streams with non-empty check lists

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) no streams with pre-answer requests

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) no checks to start

Unrecognized attribute: 0x802b

STUN-CLIENT(srflx(IP4:10.0.8.47:57340/UDP|turn.example.com:443)): Received response; processing

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate srflx(IP4:10.0.8.47:57340/UDP|turn.example.com:443)

Write buffer not empty for IP4:0.0.0.0:443/TCP 44 - already armed (@0x160026df4), not connected

STUN-CLIENT(relay(IP4:10.0.8.47:57340/UDP|turn.example.com:443)::TURN): Received response; processing

STUN-CLIENT(relay(IP4:10.0.8.47:57340/UDP|turn.example.com:443)::TURN): Error processing response: Retry may be possible, stun error code 401.

Unrecognized attribute: 0x802b

STUN-CLIENT(srflx(IP4:10.0.8.47:53521/UDP|turn.example.com:443)): Received response; processing

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate srflx(IP4:10.0.8.47:53521/UDP|turn.example.com:443)

STUN-CLIENT(relay(IP4:10.0.8.47:57340/UDP|turn.example.com:443)::TURN): Received response; processing

TURN(relay(IP4:10.0.8.47:57340/UDP|turn.example.com:443)): Succesfully allocated addr IP4:0.0.0.0:63335/UDP lifetime=3600

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate turn-relay(IP4:10.0.8.47:57340/UDP|IP4:0.0.0.0:63335/UDP)

Write buffer not empty for IP4:0.0.0.0:443/TCP 44 - already armed (@0x1600291f4), not connected

STUN-CLIENT(relay(IP4:10.0.8.47:53521/UDP|turn.example.com:443)::TURN): Received response; processing

STUN-CLIENT(relay(IP4:10.0.8.47:53521/UDP|turn.example.com:443)::TURN): Error processing response: Retry may be possible, stun error code 401.

STUN-CLIENT(relay(IP4:10.0.8.47:53521/UDP|turn.example.com:443)::TURN): Received response; processing

TURN(relay(IP4:10.0.8.47:53521/UDP|turn.example.com:443)): Succesfully allocated addr IP4:0.0.0.0:50605/UDP lifetime=3600

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate turn-relay(IP4:10.0.8.47:53521/UDP|IP4:0.0.0.0:50605/UDP)

Firing write callback (0)

Invoking writable_cb on connected (44)

Writable_cb IP4:0.0.0.0:443/TCP (0 (0x1600291f4) pending)

Firing write callback (0)

Invoking writable_cb on connected (44)

Writable_cb IP4:0.0.0.0:443/TCP (0 (0x160026df4) pending)

UpdateBufferedAmount: (tracking 1): 0, waiting: no

UpdateBufferedAmount: (tracking 1): 0, waiting: no

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Received response; processing

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Error processing response: Retry may be possible, stun error code 401.

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Received response; processing

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Error processing response: Retry may be possible, stun error code 401.

UpdateBufferedAmount: (tracking 2): 0, waiting: no

UpdateBufferedAmount: (tracking 2): 0, waiting: no

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Received response; processing

TURN(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)): Succesfully allocated addr IP4:0.0.0.0:58399/UDP lifetime=3600

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate turn-relay(IP4:10.0.8.47:0/TCP|IP4:0.0.0.0:58399/UDP)

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Received response; processing

TURN(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)): Succesfully allocated addr IP4:0.0.0.0:56773/UDP lifetime=3600

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate turn-relay(IP4:10.0.8.47:0/TCP|IP4:0.0.0.0:56773/UDP)

ICE(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default) Trickle grace period is over; marking every component with only failed pairs as failed.

ICE-PEER(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default)/STREAM(0-1531925753097790 (id=25769803783 url=http://localhost:4242/call/1 aLevel=0)/COMP(1): All pairs are failed, and grace period has elapsed. Marking component as failed.

ICE-PEER(PC:1531925753097790 (id=25769803783 url=http://localhost:4242/call/1:default): all checks completed success=0 fail=1

TURN(relay(IP4:10.0.8.47:57340/UDP|turn.example.com:443)): deallocating

TURN(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)): deallocating

TURN(relay(IP4:10.0.8.47:53521/UDP|turn.example.com:443)): deallocating

TURN(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)): deallocating

UpdateBufferedAmount: (tracking 3): 0, waiting: no

UpdateBufferedAmount: (tracking 3): 0, waiting: no

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:617 function nr_socket_multi_tcp_listen failed with error 3

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): failed to create passive TCP host candidate: 3

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:617 function nr_socket_multi_tcp_listen failed with error 3

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): failed to create passive TCP host candidate: 3

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:617 function nr_socket_multi_tcp_listen failed with error 3

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): failed to create passive TCP host candidate: 3

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:617 function nr_socket_multi_tcp_listen failed with error 3

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): failed to create passive TCP host candidate: 3

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:173 function nr_socket_multi_tcp_create_stun_server_socket skipping UDP STUN server(addr:)

/builds/worker/workspace/build/src/media/mtransport/third_party/nICEr/src/net/nr_socket_multi_tcp.c:617 function nr_socket_multi_tcp_listen failed with error 3

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): failed to create passive TCP host candidate: 3

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) has no stream matching stream 0-1531926015943360 (id=25769803783 url=http://localhost:4242/call/1 aLevel=1

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) has no stream matching stream 0-1531926015943360 (id=25769803783 url=http://localhost:4242/call/1 aLevel=2

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) no streams with non-empty check lists

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) no streams with pre-answer requests

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) no checks to start

Unrecognized attribute: 0x802b

STUN-CLIENT(srflx(IP4:10.0.8.47:55447/UDP|turn.example.com:443)): Received response; processing

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate srflx(IP4:10.0.8.47:55447/UDP|turn.example.com:443)

Write buffer not empty for IP4:0.0.0.0:443/TCP 44 - already armed (@0x14d18e5f4), not connected

STUN-CLIENT(relay(IP4:10.0.8.47:55447/UDP|turn.example.com:443)::TURN): Received response; processing

STUN-CLIENT(relay(IP4:10.0.8.47:55447/UDP|turn.example.com:443)::TURN): Error processing response: Retry may be possible, stun error code 401.

STUN-CLIENT(relay(IP4:10.0.8.47:55447/UDP|turn.example.com:443)::TURN): Received response; processing

TURN(relay(IP4:10.0.8.47:55447/UDP|turn.example.com:443)): Succesfully allocated addr IP4:0.0.0.0:56397/UDP lifetime=3600

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate turn-relay(IP4:10.0.8.47:55447/UDP|IP4:0.0.0.0:56397/UDP)

Unrecognized attribute: 0x802b

STUN-CLIENT(srflx(IP4:10.0.8.47:57093/UDP|turn.example.com:443)): Received response; processing

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate srflx(IP4:10.0.8.47:57093/UDP|turn.example.com:443)

Write buffer not empty for IP4:0.0.0.0:443/TCP 44 - already armed (@0x14d18fdf4), not connected

STUN-CLIENT(relay(IP4:10.0.8.47:57093/UDP|turn.example.com:443)::TURN): Received response; processing

STUN-CLIENT(relay(IP4:10.0.8.47:57093/UDP|turn.example.com:443)::TURN): Error processing response: Retry may be possible, stun error code 401.

STUN-CLIENT(relay(IP4:10.0.8.47:57093/UDP|turn.example.com:443)::TURN): Received response; processing

TURN(relay(IP4:10.0.8.47:57093/UDP|turn.example.com:443)): Succesfully allocated addr IP4:0.0.0.0:60501/UDP lifetime=3600

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate turn-relay(IP4:10.0.8.47:57093/UDP|IP4:0.0.0.0:60501/UDP)

Firing write callback (0)

Invoking writable_cb on connected (44)

Writable_cb IP4:0.0.0.0:443/TCP (0 (0x14d18fdf4) pending)

Firing write callback (0)

Invoking writable_cb on connected (44)

Writable_cb IP4:0.0.0.0:443/TCP (0 (0x14d18e5f4) pending)

UpdateBufferedAmount: (tracking 1): 0, waiting: no

UpdateBufferedAmount: (tracking 1): 0, waiting: no

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Received response; processing

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Error processing response: Retry may be possible, stun error code 401.

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Received response; processing

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Error processing response: Retry may be possible, stun error code 401.

UpdateBufferedAmount: (tracking 2): 0, waiting: no

UpdateBufferedAmount: (tracking 2): 0, waiting: no

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Received response; processing

TURN(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)): Succesfully allocated addr IP4:0.0.0.0:50309/UDP lifetime=3600

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate turn-relay(IP4:10.0.8.47:0/TCP|IP4:0.0.0.0:50309/UDP)

STUN-CLIENT(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)::TURN): Received response; processing

TURN(relay(IP4:10.0.8.47:0/TCP|turn.example.com:443)): Succesfully allocated addr IP4:0.0.0.0:62199/UDP lifetime=3600

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) pairing local trickle ICE candidate turn-relay(IP4:10.0.8.47:0/TCP|IP4:0.0.0.0:62199/UDP)

ICE(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1): peer (PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default) Trickle grace period is over; marking every component with only failed pairs as failed.

ICE-PEER(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default)/STREAM(0-1531926015943360 (id=25769803783 url=http://localhost:4242/call/1 aLevel=0)/COMP(1): All pairs are failed, and grace period has elapsed. Marking component as failed.

ICE-PEER(PC:1531926015943360 (id=25769803783 url=http://localhost:4242/call/1:default): all checks completed success=0 fail=1

+++++++ END ++++++++

Answer 1

出现问题是因为 zone.js 和 adapter-js 都将它们的包装器放在各种 RTC 方法之上。

解决方案是在polyfills.ts 文件的末尾添加以下行。

import 'zone.js/dist/webapis-rtc-peer-connection';

更多信息：

• https://github.com/angular/zone.js/issues/883
• https://github.com/angular/zone.js/issues/920
• https://github.com/angular/zone.js/issues/948
• https://github.com/angular/zone.js/issues/1019