Fixing response with utf-8 BOM can not parse to json (#2419)

* fix: remove byte order marker (UTF-8 BOM) when transform response

* fix: remove BOM only utf-8

* test: utf-8 BOM

* fix: incorrect param name

Co-authored-by: Jay <jasonsaayman@gmail.com>

lib/adapters/http.js

@@ -235,6 +235,9 @@ module.exports = function httpAdapter(config) {
           var responseData = Buffer.concat(responseBuffer);
           if (config.responseType !== 'arraybuffer') {
             responseData = responseData.toString(config.responseEncoding);
+            if (!config.responseEncoding || config.responseEncoding === 'utf8') {
+              responseData = utils.stripBOM(responseData);
+            }
           }
 
           response.data = responseData;