Update websocket_protocol_zh.md

Yabin Li

2023-11-15 0612ae780c637b39fe7276e62393e079daa6cfdf

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# -*- coding: utf-8 -*-
 
 
try:
    strtype = basestring
except NameError:
    strtype = str
 
 
def to_s(val):
    try:
        return unicode(val)
    except NameError:
        return str(val)