Host test case added

Author: uttamukkoji

lib/core/Util.js

@@ -1,4 +1,9 @@
 import { platform, release } from 'os'
+const HOST_REGEX = /^(?!\w+:\/\/)([\w-:]+\.)+([\w-:]+)(?::(\d+))?(?!:)$/
+
+export function isHost (host) {
+  return HOST_REGEX.test(host)
+}
 
 export function isNode () {
   return typeof process !== 'undefined' && !process.browser

lib/core/contentstackHTTPClient.js

@@ -2,7 +2,7 @@ import clonedeep from 'lodash/cloneDeep'
 import Qs from 'qs'
 import axios from 'axios'
 import contentstackRetry from './contentstack-retry'
-const HOST_REGEX = /^(?!\w+:\/\/)([^\s:]+\.[^\s:]+)(?::(\d+))?(?!:)$/
+import { isHost } from './Util'
 
 export default function contentstackHttpClient (options) {
   const defaultConfig = {
@@ -40,10 +40,10 @@ export default function contentstackHttpClient (options) {
 
   const protocol = config.insecure ? 'http' : 'https'
   let hostname = config.defaultHostName
-  let port = 443
-  const version = 'v3'
+  let port = config.port || 443
+  const version = config.version || 'v3'
 
-  if (HOST_REGEX.test(config.host)) {
+  if (isHost(config.host)) {
     const parsed = config.host.split(':')
     if (parsed.length === 2) {
       [hostname, port] = parsed