https://chromium.googlesource.com/chromium/src/net/+/master/socket/client_socket_pool.cc
// The maximum duration, in seconds, to keep used idle persistent sockets alive. int64_t g_used_idle_socket_timeout_s = 300; // 5 minutes
Connection management in chrome
https://blog.csdn.net/talking12391239/article/details/41295997