issue 594 enhancement

Author: Pradeep298

public/js/app/services.js

@@ -1172,7 +1172,7 @@ var serv = angular.module('mockapp.services',['mockapp.factories'])
             reqHeader[key] = tab.reqHeadersArr[i].v;
         }
 
-        if(reqHeader.hasOwnProperty('Content-Type') && reqHeader['Content-Type'].startsWith('application/json')){
+        if(reqHeader.hasOwnProperty('Content-Type') && reqHeader['Content-Type'] && reqHeader['Content-Type'].startsWith('application/json')){
           if(tab.requestpayload)//for blank request payload double quote was showing on ui after response.
             {
               try {
@@ -1217,11 +1217,16 @@ var serv = angular.module('mockapp.services',['mockapp.factories'])
             "reqData" : tab.requestpayload
           };
 
-          if(reqHeader.hasOwnProperty('Content-Type') && reqHeader['Content-Type'].startsWith('application/json')){
+          if(reqHeader.hasOwnProperty('Content-Type') && reqHeader['Content-Type'] && reqHeader['Content-Type'].startsWith('application/json')){
             if(tab.requestpayload && tab.requestpayload !== '{}' && tab.requestpayload !== '[]')//for blank request payload double quote was showing on ui after response.
             tab.requestpayload=JSON.stringify(tab.requestpayload,null,"    ");
           }
 
+          //if no headers then set a blank header
+          if(Object.keys(reqHeader).length === 0 && reqHeader.constructor === Object){
+            tab.reqHeadersArr = [{ id: 0, k: {originalObject: {name: null}}, v: null}]
+          }
+
           var params = {};
           //login not required for Rest Client Tool.
           //params.token = authService.getUserInfo().token;

public/partials/apitesting.html

@@ -61,7 +61,7 @@ <h2>API Testing</h2>
                   minlength="3"
                   input-class="form-control" 
                   match-class="highlight"
-                  disable-input="$index==0">
+                  disable-input="header.k.originalObject.name==='Content-Type'">
                 </div>
               </div>
 
@@ -71,8 +71,7 @@ <h2>API Testing</h2>
               </div>
 
               <div class="col-xs-1" ng-if="tabs[selectedTab].reqHeadersArr.length > 1">
-                <button type="button" class="btn btn-warning" ng-click="removeReqHeader(tabs[selectedTab].reqHeadersArr, $index)" 
-                                  ng-if="$index!==0">
+                <button type="button" class="btn btn-warning" ng-click="removeReqHeader(tabs[selectedTab].reqHeadersArr, $index)">
                   <span class="glyphicon glyphicon-minus"></span>
                 </button>
               </div>