problem found

was meant for cookie with too many headers, required header data was too big

solve the problem

nginx adds configuration

    # 502 bad gateway 错误解决配置 start
    proxy_buffer_size 64k;
    proxy_buffers 32 32k;
    proxy_busy_buffers_size 128k;
    # 502 bad gateway 错误解决配置 end
    

note the location of the configuration

individual open source project (general back office management system) — > Can look at https://gitee.com/wslxm/spring-boot-plus2, like
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