[sc-9487] add option in setApiHostname to apply only for search or stats endpoint

Author: haoAddsearch

README.md

@@ -408,6 +408,9 @@ client.setThrottleTime(500);
 ```
 
 #### Set API hostname
+`option` is an object with the following properties, all of which are optional. If `option` is not defined, host name will be applied for all requests.
+- **searchApiRequestOnly**: If true, the new host name is only applied for searchApi requests (default: false)
+- **statsApiRequestOnly**: If true, the new host name is only applied for statsApi requests (default: false)
 ```js
 // Set API hostname (e.g. for dedicated environments)
 client.setApiHostname('api.addsearch.com');

src/index.js

@@ -16,6 +16,7 @@ var client = function(sitekey, privatekey) {
   this.sitekey = sitekey;
   this.privatekey = privatekey;
   this.apiHostname = API_HOSTNAME;
+  this.statsApiHostname = API_HOSTNAME;
   this.settings = new Settings();
   this.sessionId = ('a-' + (Math.random() * 100000000)).substring(0, 10);
   this.userTokenInPersonalization = cookie.getCookie(USER_TOKEN_COOKIE_NAME) || util.generateUUID();
@@ -174,7 +175,14 @@ var client = function(sitekey, privatekey) {
   /**
    * Public functions
    */
-  this.setApiHostname = function(hostname) {this.apiHostname = hostname;}
+  this.setApiHostname = function(hostname, conf) {
+    if (!conf || !conf.statsApiRequestOnly) {
+      this.apiHostname = hostname;
+    }
+    if (!conf || !conf.searchApiRequestOnly) {
+      this.statsApiHostname = hostname;
+    }
+  }
   this.getSettings = function() {return this.settings.getSettings();}
   this.setLanguage = function(lang) {this.settings.setLanguage(lang);}
   this.setCategoryFilters = function(categories) {this.settings.setCategoryFilters(categories);}
@@ -228,7 +236,7 @@ var client = function(sitekey, privatekey) {
         numberOfResults: data.numberOfResults,
         tag: this.getSettings().analyticsTag
       };
-      sendStats(this.apiHostname, this.sitekey, payload, this.settings.getSettings().statsRequestIntercepted);
+      sendStats(this.statsApiHostname, this.sitekey, payload, this.settings.getSettings().statsRequestIntercepted);
     }
 
     else if (type === 'click') {
@@ -240,7 +248,7 @@ var client = function(sitekey, privatekey) {
         position: data.position,
         tag: this.getSettings().analyticsTag
       };
-      sendStats(this.apiHostname, this.sitekey, payload, this.settings.getSettings().statsRequestIntercepted);
+      sendStats(this.statsApiHostname, this.sitekey, payload, this.settings.getSettings().statsRequestIntercepted);
     }
 
     else {