Description'

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Please describe the issue you encountered here.
'
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1. SRS version: 3.0.112
2. The log of SRS is as follows:

[2020-02-12 11:08:02.825][Warn][1][430][107] accept client failed, err is code=1006 : fd2conn : ignore empty ip, fd=4749
thread [1][430]: accept_client() [src/app/srs_app_server.cpp:1165][errno=107]
thread [1][430]: fd2conn() [src/app/srs_app_server.cpp:1192][errno=107]

[2020-02-12 11:08:03.013][Warn][1][431][107] accept client failed, err is code=1006 : fd2conn : ignore empty ip, fd=4750
thread [1][431]: accept_client() [src/app/srs_app_server.cpp:1165][errno=107]
thread [1][431]: fd2conn() [src/app/srs_app_server.cpp:1192][errno=107]

Replay

How to replay bug?

Steps to reproduce the bug

Steps to reproduce the bug:

1. Load balancing service of cloud service, with SRS attached at the back.
2. Set health check as TCP or HTTP.
3. A large number of logs appear, approximately one every 100 milliseconds.

Expected behavior:

Support SLB health check, TCP or HTTP method, refer to Aliyun SLB Health Check.

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