fix(Wordpress Node): Send no-cache header on write requests (#20473)

Signed-off-by: Muhammed Hussain Karimi <info@karimi.dev>
Co-authored-by: Elias Meire <elias@meire.dev>

packages/nodes-base/nodes/Wordpress/GenericFunctions.ts

@@ -42,11 +42,18 @@ export async function wordpressApiRequest(
 		rejectUnauthorized = !(credentials.allowUnauthorizedCerts as boolean);
 	}
 
+	const headers: IDataObject = {
+		Accept: 'application/json',
+		'Content-Type': 'application/json',
+	};
+	// Some WordPress caching plugins ignore the request method and serve a cached
+	// GET response to writes, which silently returns existing posts instead of creating one.
+	if (!['GET', 'HEAD'].includes(method)) {
+		headers['Cache-Control'] = 'no-cache';
+	}
+
 	let options: IRequestOptions = {
-		headers: {
-			Accept: 'application/json',
-			'Content-Type': 'application/json',
-		},
+		headers,
 		method,
 		qs,
 		body,

packages/nodes-base/nodes/Wordpress/__tests__/GenericFunctions.test.ts

@@ -46,6 +46,26 @@ describe('Wordpress > GenericFunctions', () => {
 			);
 		});
 
+		it('should set Cache-Control to no-cache for write requests', async () => {
+			mockFunctions.helpers.requestWithAuthentication.mockResolvedValue({ data: 'testData' });
+			await wordpressApiRequest.call(mockFunctions, 'POST', '/posts', {}, {});
+
+			expect(mockFunctions.helpers.requestWithAuthentication).toHaveBeenCalledWith(
+				'wordpressApi',
+				expect.objectContaining({
+					headers: expect.objectContaining({ 'Cache-Control': 'no-cache' }),
+				}),
+			);
+		});
+
+		it('should not set Cache-Control for GET requests', async () => {
+			mockFunctions.helpers.requestWithAuthentication.mockResolvedValue({ data: 'testData' });
+			await wordpressApiRequest.call(mockFunctions, 'GET', '/posts', {}, {});
+
+			const callArgs = mockFunctions.helpers.requestWithAuthentication.mock.calls[0][1];
+			expect(callArgs.headers).not.toHaveProperty('Cache-Control');
+		});
+
 		it('should throw NodeApiError on failure', async () => {
 			mockFunctions.helpers.requestWithAuthentication.mockRejectedValue({ message: 'fail' });
 			await expect(