import takeUntil and fix comparison

Author: Stefan Schubert

src/mustache/api.service.mustache

@@ -24,7 +24,7 @@ import { Subject }                                           from 'rxjs/Subject'
 {{/useRxJS6}}
 {{#useRxJS6}}
 import { Observable, Subject }                               from 'rxjs';
-import { catchError }                                        from 'rxjs/operators';
+import { catchError, takeUntil }                             from 'rxjs/operators';
 {{/useRxJS6}}
 {{^useHttpClient}}
 import '../rxjs-operators';
@@ -338,7 +338,7 @@ export class {{classname}} {
             this.cancelMap['{{operationIdOriginal}}'].complete();
             this.cancelMap['{{operationIdOriginal}}'] = null;
         }
-        this.cancelMap['{{operationIdOriginal}}'] = {{httpMethod}} === 'GET' ? new Subject<any>() : null;
+        this.cancelMap['{{operationIdOriginal}}'] = '{{httpMethod}}'.toUpperCase() === 'GET' ? new Subject<any>() : null;
         if(this.cancelMap['{{operationIdOriginal}}']) {
             handle = handle.pipe(takeUntil(this.cancelMap['{{operationIdOriginal}}']));
         }
@@ -377,7 +377,7 @@ export class {{classname}} {
             this.cancelMap['{{operationIdOriginal}}'].complete();
             this.cancelMap['{{operationIdOriginal}}'] = null;
         }
-        this.cancelMap['{{operationIdOriginal}}'] = {{httpMethod}} === 'GET' ? new Subject<any>() : null;
+        this.cancelMap['{{operationIdOriginal}}'] = '{{httpMethod}}'.toUpperCase() === 'GET' ? new Subject<any>() : null;
         if(this.cancelMap['{{operationIdOriginal}}']) {
             handle = handle.takeUntil(this.cancelMap['{{operationIdOriginal}}']);
         }