Added support for hub protocol (#10434)

docs/en/advanced-concepts/grid.md

@@ -47,6 +47,7 @@ you will see your device on the grid console page:
     "registerCycle": 5000,
     "hubPort": <grid_port>,
     "hubHost": "<Grid_host_name_or_grid_ip-address>"
+    "hubProtocol": "<Protocol_of_Grid_defaults_to_http>"
   }
 }
 ```

lib/grid-register.js

@@ -2,6 +2,10 @@ import request from 'request-promise';
 import { fs } from 'appium-support';
 import logger from './logger';
 
+const hubUri = (config) => {
+  const protocol = config.hubProtocol || 'http';
+  return `${protocol}://${config.hubHost}:${config.hubPort}`;
+};
 
 async function registerNode (configFile, addr, port) {
   let data;
@@ -26,7 +30,7 @@ async function registerToGrid (options_post, jsonObject) {
     if (response === undefined || response.statusCode !== 200) {
       throw new Error('Request failed');
     }
-    let logMessage = `Appium successfully registered with the grid on ${jsonObject.configuration.hubHost}:${jsonObject.configuration.hubPort}`;
+    let logMessage = `Appium successfully registered with the grid on ${hubUri(jsonObject.configuration)}`;
     logger.debug(logMessage);
   } catch (err) {
     logger.error(`Request to register with grid was unsuccessful: ${err.message}`);
@@ -79,7 +83,7 @@ async function postRequest (data, addr, port) {
   };
   // the post options
   let post_options = {
-    url: `http://${jsonObject.configuration.hubHost}:${jsonObject.configuration.hubPort}/grid/register`,
+    url: `${hubUri(jsonObject.configuration)}/grid/register`,
     method: 'POST',
     body: data,
     headers: post_headers,
@@ -116,7 +120,7 @@ async function isAlreadyRegistered (jsonObject) {
   let id = jsonObject.configuration.id;
   try {
     let response = await request({
-      uri: `http://${jsonObject.configuration.hubHost}:${jsonObject.configuration.hubPort}/grid/api/proxy?id=${id}`,
+      uri: `${hubUri(jsonObject.configuration)}/grid/api/proxy?id=${id}`,
       method  : 'GET',
       timeout : 10000,
       resolveWithFullResponse: true // return the full response, not just the body