feat: Implement getHeader and appendHeader methods in adapters

packages/core/adapters/http-adapter.ts

@@ -117,7 +117,11 @@ export abstract class AbstractHttpAdapter<
   abstract setErrorHandler(handler: Function, prefix?: string);
   abstract setNotFoundHandler(handler: Function, prefix?: string);
   abstract isHeadersSent(response: any);
+  // TODO remove optional signature (v11)
+  abstract getHeader?(response: any, name: string);
   abstract setHeader(response: any, name: string, value: string);
+  // TODO remove optional signature (v11)
+  abstract appendHeader?(response: any, name: string, value: string);
   abstract registerParserMiddleware(prefix?: string, rawBody?: boolean);
   abstract enableCors(
     options: CorsOptions | CorsOptionsDelegate<TRequest>,

packages/core/test/utils/noop-adapter.spec.ts

@@ -21,7 +21,9 @@ export class NoopHttpAdapter extends AbstractHttpAdapter {
   setErrorHandler(handler: Function, prefix = '/'): any {}
   setNotFoundHandler(handler: Function, prefix = '/'): any {}
   isHeadersSent(response: any): any {}
+  getHeader?(response: any, name: string) {}
   setHeader(response: any, name: string, value: string): any {}
+  appendHeader?(response: any, name: string, value: string) {}
   registerParserMiddleware(): any {}
   enableCors(options: any): any {}
   createMiddlewareFactory(requestMethod: RequestMethod): any {}

packages/platform-express/adapters/express-adapter.ts

@@ -143,10 +143,18 @@ export class ExpressAdapter extends AbstractHttpAdapter<
     return response.headersSent;
   }
 
+  public getHeader?(response: any, name: string) {
+    return response.get(name);
+  }
+
   public setHeader(response: any, name: string, value: string) {
     return response.set(name, value);
   }
 
+  public appendHeader?(response: any, name: string, value: string) {
+    return response.append(name, value);
+  }
+
   public listen(port: string | number, callback?: () => void): Server;
   public listen(
     port: string | number,

packages/platform-fastify/adapters/fastify-adapter.ts

@@ -466,10 +466,18 @@ export class FastifyAdapter<
     return response.sent;
   }
 
+  public getHeader?(response: any, name: string) {
+    return response.getHeader(name);
+  }
+
   public setHeader(response: TReply, name: string, value: string) {
     return response.header(name, value);
   }
 
+  public appendHeader?(response: any, name: string, value: string) {
+    response.header(name, value);
+  }
+
   public getRequestHostname(request: TRequest): string {
     return request.hostname;
   }