Added support for application/xml handling to include XML envelop body

Author: Vishal Shingala

lib/schemaUtils.js

@@ -28,6 +28,7 @@ const { formatDataPath, checkIsCorrectType, isKnownType } = require('./common/sc
   APP_JSON = 'application/json',
   APP_JS = 'application/javascript',
   TEXT_XML = 'text/xml',
+  APP_XML = 'application/xml',
   TEXT_PLAIN = 'text/plain',
   TEXT_HTML = 'text/html',
   FORM_DATA = 'multipart/form-data',
@@ -1910,6 +1911,7 @@ module.exports = {
       else if (contentObj.hasOwnProperty(APP_JSON)) { bodyType = APP_JSON; }
       else if (contentObj.hasOwnProperty(TEXT_HTML)) { bodyType = TEXT_HTML; }
       else if (contentObj.hasOwnProperty(TEXT_PLAIN)) { bodyType = TEXT_PLAIN; }
+      else if (contentObj.hasOwnProperty(APP_XML)) { bodyType = APP_XML; }
       else if (contentObj.hasOwnProperty(TEXT_XML)) { bodyType = TEXT_XML; }
       else {
         // take the first property it has
@@ -1930,20 +1932,24 @@ module.exports = {
         };
       }
       else {
-        bodyData = this.convertToPmBodyData(contentObj[bodyType], requestType, bodyType,
-          PARAMETER_SOURCE.REQUEST, options.indentCharacter, components, options, schemaCache);
         let getXmlVersionContent = (bodyContent) => {
           const regExp = new RegExp('([<\\?xml]+[\\s{1,}]+[version="\\d.\\d"]+[\\sencoding="]+.{1,15}"\\?>)');
           let xmlBody = bodyContent;
+
           if (!bodyContent.match(regExp)) {
-            const versionContent = '<?xml version="1.0" encoding="utf-8"?>';
+            const versionContent = '<?xml version="1.0" encoding="UTF-8"?>\n';
             xmlBody = versionContent + xmlBody;
           }
           return xmlBody;
         };
-        bodyData = bodyType === TEXT_XML ?
+
+        bodyData = this.convertToPmBodyData(contentObj[bodyType], requestType, bodyType,
+          PARAMETER_SOURCE.REQUEST, options.indentCharacter, components, options, schemaCache);
+
+        bodyData = (bodyType === TEXT_XML || bodyType === APP_XML) ?
           getXmlVersionContent(bodyData) :
           bodyData;
+
         updateOptions = {
           mode: rDataMode,
           raw: bodyType !== APP_JSON ?