feat(HTTP Request Tool Node): Relax binary data detection (#13048)

packages/@n8n/nodes-langchain/nodes/tools/ToolHttpRequest/test/ToolHttpRequest.node.test.ts

@@ -237,6 +237,69 @@ describe('ToolHttpRequest', () => {
 				}),
 			);
 		});
+
+		it('should return the error when receiving text that contains a null character', async () => {
+			helpers.httpRequest.mockResolvedValue({
+				body: 'Hello\0World',
+				headers: {
+					'content-type': 'text/plain',
+				},
+			});
+
+			executeFunctions.getNodeParameter.mockImplementation((paramName: string) => {
+				switch (paramName) {
+					case 'method':
+						return 'GET';
+					case 'url':
+						return 'https://httpbin.org/text/plain';
+					case 'options':
+						return {};
+					case 'placeholderDefinitions.values':
+						return [];
+					default:
+						return undefined;
+				}
+			});
+
+			const { response } = await httpTool.supplyData.call(executeFunctions, 0);
+			const res = await (response as N8nTool).invoke({});
+			expect(helpers.httpRequest).toHaveBeenCalled();
+			// Check that the returned string is formatted as an error message.
+			expect(res).toContain('error');
+			expect(res).toContain('Binary data is not supported');
+		});
+
+		it('should return the error when receiving a JSON response containing a null character', async () => {
+			// Provide a raw JSON string with a literal null character.
+			helpers.httpRequest.mockResolvedValue({
+				body: '{"message":"hello\0world"}',
+				headers: {
+					'content-type': 'application/json',
+				},
+			});
+
+			executeFunctions.getNodeParameter.mockImplementation((paramName: string) => {
+				switch (paramName) {
+					case 'method':
+						return 'GET';
+					case 'url':
+						return 'https://httpbin.org/json';
+					case 'options':
+						return {};
+					case 'placeholderDefinitions.values':
+						return [];
+					default:
+						return undefined;
+				}
+			});
+
+			const { response } = await httpTool.supplyData.call(executeFunctions, 0);
+			const res = await (response as N8nTool).invoke({});
+			expect(helpers.httpRequest).toHaveBeenCalled();
+			// Check that the tool returns an error string rather than resolving to valid JSON.
+			expect(res).toContain('error');
+			expect(res).toContain('Binary data is not supported');
+		});
 	});
 
 	describe('Optimize response', () => {