fix: IE11 compatibility issue due to is-https package (#1138)

Fixes #1137

package.json

@@ -93,7 +93,6 @@
     "@intlify/vue-i18n-loader": "^1.0.0",
     "cookie": "^0.4.0",
     "devalue": "^2.0.1",
-    "is-https": "^3.0.0",
     "js-cookie": "^2.2.1",
     "klona": "^2.0.4",
     "lodash.merge": "^4.6.2",

src/templates/utils-common.js

@@ -1,6 +1,5 @@
 import Cookie from 'cookie'
 import JsCookie from 'js-cookie'
-import isHTTPS from 'is-https'
 
 /** @typedef {import('../../types/internal').ResolvedOptions} ResolvedOptions */
 
@@ -134,6 +133,35 @@ export function getDomainFromLocale (localeCode, req, { normalizedLocales }) {
   console.warn(formatMessage(`Could not find domain name for locale ${localeCode}`))
 }
 
+/**
+ * Determines if a server-side request is using HTTPS.
+ *
+ * @param {import('http').IncomingMessage} req
+ * @param {Boolean} [trustProxy=true]
+ * @return {Boolean | undefined}.
+ */
+function isHTTPS (req, trustProxy = true) {
+  // Check x-forwarded-proto header
+  const _xForwardedProto = (trustProxy && req.headers) ? req.headers['x-forwarded-proto'] : undefined
+  const protoCheck = typeof _xForwardedProto === 'string' ? _xForwardedProto.includes('https') : undefined
+  if (protoCheck) {
+    return true
+  }
+
+  const socket = /** @type {import('tls').TLSSocket} */(req.socket)
+  const _encrypted = socket ? socket.encrypted : undefined
+  const encryptedCheck = _encrypted !== undefined ? _encrypted === true : undefined
+  if (encryptedCheck) {
+    return true
+  }
+
+  if (protoCheck === undefined && encryptedCheck === undefined) {
+    return undefined
+  }
+
+  return false
+}
+
 /**
  * Get locale code that corresponds to current hostname
  *

yarn.lock

@@ -7061,11 +7061,6 @@ is-glob@^4.0.0, is-glob@^4.0.1, is-glob@~4.0.1:
   dependencies:
     is-extglob "^2.1.1"
 
-is-https@^3.0.0:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/is-https/-/is-https-3.0.2.tgz#4d24e002e47edd3f1b07f14bc722433354ccba49"
-  integrity sha512-jFgAKhbNF7J+lTMJxbq5z9bf1V9f8rXn9mP5RSY2GUEW5M0nOiVhVC9dNra96hQDjGpNzskIzusUnXwngqmhAA==
-
 is-installed-globally@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/is-installed-globally/-/is-installed-globally-0.4.0.tgz#9a0fd407949c30f86eb6959ef1b7994ed0b7b520"