For #1488, improve coverage for parsing client ip.
For #1488, improve coverage for parsing client ip.

winlinvip/srs,winlinvip/srs,ossrs/srs,winlinvip/srs,ossrs/srs,ossrs/srs,ossrs/srs,winlinvip/srs,ossrs/srs,winlinvip/srs,ossrs/srs,winlinvip/srs,winlinvip/simple-rtmp-server