update example .html to use socketio v4.7.5 rather than 1.x #168
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…tibility with current flask-socketio
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Update the socketio version used in the /example/templates/index.html filr to use version 4 rather than version 1.
Using v1 here gives you an error message and won't work when using recent versions of flask-socketio.
See https://flask-socketio.readthedocs.io/en/latest/intro.html#version-compatibility for js socketio <-> flask-socketio version compatibilities.
Example works fine for me after the fix.