diff --git a/packages/@vue/cli-service/lib/commands/serve.js b/packages/@vue/cli-service/lib/commands/serve.js
index cc66855e8b..c4fad51798 100644
--- a/packages/@vue/cli-service/lib/commands/serve.js
+++ b/packages/@vue/cli-service/lib/commands/serve.js
@@ -101,7 +101,11 @@ module.exports = (api, options) => {
}
// resolve server options
- const useHttps = args.https || projectDevServerOptions.https || defaults.https
+ const modesUseHttps = ['https', 'http2']
+ const serversUseHttps = ['https', 'spdy']
+ const optionsUseHttps = modesUseHttps.some(modeName => !!projectDevServerOptions[modeName]) ||
+ (typeof projectDevServerOptions.server === 'string' && serversUseHttps.includes(projectDevServerOptions.server))
+ const useHttps = args.https || optionsUseHttps || defaults.https
const protocol = useHttps ? 'https' : 'http'
const host = args.host || process.env.HOST || projectDevServerOptions.host || defaults.host
portfinder.basePort = args.port || process.env.PORT || projectDevServerOptions.port || defaults.port
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