Article From:https://segmentfault.com/q/1010000012144615
Question:

javaWeb How to know the network condition of requesting users (2G, 2G, 4G, WIFI, etc.)

Answer 0:

At present, it can only be judged by UA. Some QQ browsers, micro-blog, WeChat will write the user’s network to UserAgent, and you can get it through header.

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