changed the order of content type headers in openapi spec file and giving json as a first preference

lib/util.js

@@ -602,25 +602,19 @@ module.exports = {
         responseBody: ''
       };
     }
-    let headers = Object.keys(contentObj),
-      result = [];
+    let headers = Object.keys(contentObj);
 
     for (let i = 0; i < headers.length; i++) {
       let headerFamily = this.getHeaderFamily(headers[i]);
       if (headerFamily !== HEADER_TYPE.INVALID) {
-        result.push(headerFamily);
+        cTypeHeader = headers[i];
+        hasComputedType = true;
+        if (headerFamily === HEADER_TYPE.JSON) {
+          break;
+        }
       }
     }
 
-    if (result[HEADER_TYPE.JSON]) {
-      cTypeHeader = result[HEADER_TYPE.JSON];
-      hasComputedType = true;
-    }
-    else if (result[HEADER_TYPE.XML]) {
-      cTypeHeader = result[HEADER_TYPE.XML];
-      hasComputedType = true;
-    }
-
     // if no JSON or XML, take whatever we have
     if (!hasComputedType) {
       cTypes = Object.keys(contentObj);

test/data/valid_openapi/custom_headers.json

@@ -30,13 +30,13 @@
 					"200": {
 						"description": "Ok: Successfully processed the request.",
 						"content": {
-							"application/vnd.retailer.v3+json": {
+							"application/vnd.retailer.v3+xml": {
 								"schema": {
 									"type": "integer",
 									"format": "int32"
 								}
 							},
-							"application/vnd.retailer.v3+xml": {
+							"application/vnd.retailer.v3+json": {
 								"schema": {
 									"type": "integer",
 									"format": "int32"

test/unit/base.test.js

@@ -41,7 +41,7 @@ describe('CONVERT FUNCTION TESTS ', function() {
         done();
       });
     });
-    it('should generate collection for a custom content type headers requests.' +
+    it('Should generate collection for a custom content type headers requests' +
       specPath4, function(done) {
       var openapi = fs.readFileSync(specPath4, 'utf8');
       Converter.convert({ type: 'string', data: openapi }, { schemaFaker: true }, (err, conversionResult) => {