---
# System prepended metadata

title: Agora Logs

---

# Agora Logs

```
10:40:48:188 Agora-SDK [INFO]: [client-181a4] Initializing AgoraRTC client v4.0.1 build: v4.0.1-0-g05d38ea(7/17/2020, 5:32:05 PM), mode: rtc, codec: vp8 AgoraRTC_N-production.js:5
10:40:48:190 Agora-SDK [INFO]: [client-181a4] start join channel test AgoraRTC_N-production.js:5
10:40:48:190 Agora-SDK [INFO]: [client-181a4] connection state change: DISCONNECTED -> CONNECTING AgoraRTC_N-production.js:5
10:40:48:193 Agora-SDK [DEBUG]: Flush cached event reporting: 1 0.chunk.js:5976:89
10:40:48:195 Agora-SDK [DEBUG]: [client-181a4] Connect to choose_server: https://webrtc2-ap-web-1.agora.io/api/v1 0.chunk.js:5976:89
10:40:48:197 Agora-SDK [DEBUG]: [client-181a4] Connect to choose_server: https://webrtc2-ap-web-2.agoraio.cn/api/v1 0.chunk.js:5976:89
The development server has disconnected.
Refresh the page if necessary. 0.chunk.js:23517:13
[HMR] Waiting for update signal from WDS... log.js:24
Download the React DevTools for a better development experience: https://fb.me/react-devtools react-dom.development.js:24994
10:40:48:531 Agora-SDK [INFO]: browser compatibility {"getDisplayMedia":true,"getStreamFromExtension":false,"supportUnifiedPlan":true,"supportMinBitrate":false,"supportSetRtpSenderParameters":true,"supportDualStream":true,"webAudioMediaStreamDest":true,"supportReplaceTrack":true,"supportWebGL":true,"webAudioWithAEC":true,"supportRequestFrame":false,"supportShareAudio":false} {"name":"Firefox","version":"80","os":"Mac OS X"}

10:42:53:656 Agora-SDK [INFO]: [client-2edc3] Initializing AgoraRTC client v4.0.1 build: v4.0.1-0-g05d38ea(7/17/2020, 5:32:05 PM), mode: rtc, codec: vp8 AgoraRTC_N-production.js:5
10:42:53:658 Agora-SDK [INFO]: [client-2edc3] start join channel test AgoraRTC_N-production.js:5
10:42:53:659 Agora-SDK [INFO]: [client-2edc3] connection state change: DISCONNECTED -> CONNECTING AgoraRTC_N-production.js:5
10:42:53:660 Agora-SDK [DEBUG]: Flush cached event reporting: 1 AgoraRTC_N-production.js:5
10:42:53:664 Agora-SDK [DEBUG]: [client-2edc3] Connect to choose_server: https://webrtc2-ap-web-1.agora.io/api/v1 AgoraRTC_N-production.js:5
10:42:53:665 Agora-SDK [DEBUG]: [client-2edc3] Connect to choose_server: https://webrtc2-ap-web-2.agoraio.cn/api/v1

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:54:451 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
10:42:54:722 Agora-SDK [DEBUG]: [client-2edc3] Connect to backup choose_server: https://webrtc2-ap-web-3.agora.io/api/v1 AgoraRTC_N-production.js:5
10:42:54:723 Agora-SDK [DEBUG]: [client-2edc3] Connect to backup choose_server: https://webrtc2-ap-web-4.agoraio.cn/api/v1

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:54:451 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
10:42:54:722 Agora-SDK [DEBUG]: [client-2edc3] Connect to backup choose_server: https://webrtc2-ap-web-3.agora.io/api/v1 AgoraRTC_N-production.js:5
10:42:54:723 Agora-SDK [DEBUG]: [client-2edc3] Connect to backup choose_server: https://webrtc2-ap-web-4.agoraio.cn/api/v1 AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:54:779 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:55:795 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:55:819 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:56:200 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:56:263 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:57:239 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:57:359 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:57:995 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:58:153 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:59:64 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:42:59:200 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:00:189 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:00:339 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:01:450 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:01:468 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:02:588 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:03:161 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:04:139 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:04:786 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:05:721 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:06:804 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:07:819 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:09:304 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:09:565 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:11:709 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:12:588 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:14:839 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:15:821 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:18:480 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:19:387 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:21:846 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:25:185 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:28:521 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:29:570 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:31:684 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:35:802 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:39:693 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:40:689 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:42:979 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:46:567 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:50:758 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:51:694 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
10:43:53:658 Agora-SDK [DEBUG]: Client.join timeout AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:54:152 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:43:57:295 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:44:01:857 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:44:02:808 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:44:05:463 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:44:08:4 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-2.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:44:12:926 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-3.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:44:13:915 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-4.agoraio.cn/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:44:17:233 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
AgoraRTC_N-production.js:5
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://webrtc2-ap-web-1.agora.io/api/v1?action=wrtc_gateway. (Reason: CORS request did not succeed).

10:44:18:756 Agora-SDK [WARNING]: [client-2edc3] Choose server network error, retry 
Object { name: "AgoraRTCException", code: "NETWORK_ERROR", message: "AgoraRTCError NETWORK_ERROR: Network Error", data: undefined }
```