Merge pull request #13027 from dammy001/chore/allow-passing-function-in-header

chore(core): allow dynamic value for header value

Author: kamilmysliwiec

packages/common/decorators/http/header.decorator.ts

@@ -6,6 +6,7 @@ import { extendArrayMetadata } from '../../utils/extend-metadata.util';
  *
  * For example:
  * `@Header('Cache-Control', 'none')`
+ * `@Header('Cache-Control', () => 'none')`
  *
  * @param name string to be used for header name
  * @param value string to be used for header value
@@ -14,7 +15,7 @@ import { extendArrayMetadata } from '../../utils/extend-metadata.util';
  *
  * @publicApi
  */
-export function Header(name: string, value: string): MethodDecorator {
+export function Header(name: string, value: string | (() => string)): MethodDecorator {
   return (
     target: object,
     key: string | symbol,

packages/core/router/router-response-controller.ts

@@ -17,7 +17,7 @@ import {
 
 export interface CustomHeader {
   name: string;
-  value: string;
+  value: string | (() => string);
 }
 
 export interface RedirectResponse {
@@ -84,7 +84,11 @@ export class RouterResponseController {
     headers: CustomHeader[],
   ) {
     headers.forEach(({ name, value }) =>
-      this.applicationRef.setHeader(response, name, value),
+      this.applicationRef.setHeader(
+        response,
+        name,
+        typeof value === 'function' ? value() : value
+      ),
     );
   }