distinguis `netERR_CONNECTION_TIMED_OUT` from `netERR_CERT_AUTHORITY_INVALID`

e instanceof TypeError: true
client.module.js:199 e.message: Failed to fetch
client.module.js:200 e.name: TypeError
client.module.js:201 e.fileName: undefined
client.module.js:202 e.lineNumber: undefined
client.module.js:203 e.columnNumber: undefined
client.module.js:204 e.stack: TypeError: Failed to fetch
    at yn.mounted (https://localhost:8443/client.module.js:195:36)
    at Rt (https://cdn.jsdelivr.net/npm/vue@2.6.12/dist/vue.esm.browser.min.js:6:10992)
    at qe (https://cdn.jsdelivr.net/npm/vue@2.6.12/dist/vue.esm.browser.min.js:6:24968)
    at https://cdn.jsdelivr.net/npm/vue@2.6.12/dist/vue.esm.browser.min.js:6:67609
    at yn.$mount (https://cdn.jsdelivr.net/npm/vue@2.6.12/dist/vue.esm.browser.min.js:6:67628)
    at yn.$mount (https://cdn.jsdelivr.net/npm/vue@2.6.12/dist/vue.esm.browser.min.js:6:92832)
    at e._init (https://cdn.jsdelivr.net/npm/vue@2.6.12/dist/vue.esm.browser.min.js:6:32472)
    at new yn (https://cdn.jsdelivr.net/npm/vue@2.6.12/dist/vue.esm.browser.min.js:6:29795)
    at https://localhost:8443/client.module.js:156:20
client.module.js:206