fix: only set keep-alive header before Node.js 14.8.0 (#4457)

Author: atian25

app/middleware/meta.js

@@ -4,7 +4,12 @@
 
 'use strict';
 
+const semver = require('semver');
+
 module.exports = options => {
+  // Node.js >=14.8.0 will set Keep-Alive Header, see https://github.com/nodejs/node/pull/34561
+  const shouldPatchKeepAliveHeader = semver.lt(process.version, '14.8.0');
+
   return async function meta(ctx, next) {
     if (options.logging) {
       ctx.coreLogger.info('[meta] request started, host: %s, user-agent: %s', ctx.host, ctx.header['user-agent']);
@@ -13,9 +18,9 @@ module.exports = options => {
     // total response time header
     ctx.set('x-readtime', Date.now() - ctx.starttime);
 
-    // try to support Keep-Alive Header
+    // try to support Keep-Alive Header when < 14.8.0
     const server = ctx.app.server;
-    if (server && server.keepAliveTimeout && server.keepAliveTimeout >= 1000 && ctx.header.connection !== 'close') {
+    if (shouldPatchKeepAliveHeader && server && server.keepAliveTimeout && server.keepAliveTimeout >= 1000 && ctx.header.connection !== 'close') {
       /**
        * use Math.floor instead of parseInt. More: https://github.com/eggjs/egg/pull/2702
        */

package.json

@@ -49,6 +49,7 @@
     "ms": "^2.1.1",
     "mz": "^2.7.0",
     "on-finished": "^2.3.0",
+    "semver": "^7.3.2",
     "sendmessage": "^1.1.0",
     "urllib": "^2.33.0",
     "utility": "^1.15.0",