fix(HTTP Request Node): Always lowercase headers

packages/nodes-base/test/utils/utilities.test.ts

@@ -1,4 +1,4 @@
-import { fuzzyCompare } from '../../utils/utilities';
+import { fuzzyCompare, keysToLowercase } from '../../utils/utilities';
 
 //most test cases for fuzzyCompare are done in Compare Datasets node tests
 describe('Test fuzzyCompare', () => {
@@ -29,3 +29,36 @@ describe('Test fuzzyCompare', () => {
 		expect(compareFunction(null, '0')).toEqual(false);
 	});
 });
+
+describe('Test keysToLowercase', () => {
+	it('should convert keys to lowercase', () => {
+		const headers = {
+			'Content-Type': 'application/json',
+			'X-Test-Header': 'Test',
+			Accept: 'application/json',
+		};
+
+		const newHeaders = keysToLowercase(headers);
+
+		expect(newHeaders).toEqual({
+			'content-type': 'application/json',
+			'x-test-header': 'Test',
+			accept: 'application/json',
+		});
+	});
+	it('should return original value if it is not an object', () => {
+		const test1 = keysToLowercase(['hello']);
+		const test2 = keysToLowercase('test');
+		const test3 = keysToLowercase(1);
+		const test4 = keysToLowercase(true);
+		const test5 = keysToLowercase(null);
+		const test6 = keysToLowercase(undefined);
+
+		expect(test1).toEqual(['hello']);
+		expect(test2).toEqual('test');
+		expect(test3).toEqual(1);
+		expect(test4).toEqual(true);
+		expect(test5).toEqual(null);
+		expect(test6).toEqual(undefined);
+	});
+});