fix(HTTP Request Node): Always lowercase headers

packages/nodes-base/nodes/HttpRequest/V3/HttpRequestV3.node.ts

@@ -24,6 +24,7 @@ import {
 	replaceNullValues,
 	sanitizeUiMessage,
 } from '../GenericFunctions';
+import { keysToLowercase } from '../../../utils/utilities';
 
 function toText<T>(data: T) {
 	if (typeof data === 'object' && data !== null) {
@@ -1033,17 +1034,21 @@ export class HttpRequestV3 implements INodeType {
 			const body = this.getNodeParameter('body', itemIndex, '') as string;
 
 			const sendHeaders = this.getNodeParameter('sendHeaders', itemIndex, false) as boolean;
+
 			const headerParameters = this.getNodeParameter(
 				'headerParameters.parameters',
 				itemIndex,
 				[],
 			) as [{ name: string; value: string }];
+
 			const specifyHeaders = this.getNodeParameter(
 				'specifyHeaders',
 				itemIndex,
 				'keypair',
 			) as string;
+
 			const jsonHeadersParameter = this.getNodeParameter('jsonHeaders', itemIndex, '') as string;
+
 			const {
 				redirect,
 				batching,
@@ -1221,8 +1226,8 @@ export class HttpRequestV3 implements INodeType {
 					requestOptions.body = uploadData;
 					requestOptions.headers = {
 						...requestOptions.headers,
-						'Content-Length': contentLength,
-						'Content-Type': itemBinaryData.mimeType ?? 'application/octet-stream',
+						'content-length': contentLength,
+						'content-type': itemBinaryData.mimeType ?? 'application/octet-stream',
 					};
 				} else if (bodyContentType === 'raw') {
 					requestOptions.body = body;
@@ -1253,8 +1258,9 @@ export class HttpRequestV3 implements INodeType {
 
 			// Get parameters defined in the UI
 			if (sendHeaders && headerParameters) {
+				let additionalHeaders: IDataObject = {};
 				if (specifyHeaders === 'keypair') {
-					requestOptions.headers = headerParameters.reduce(parametersToKeyValue, {});
+					additionalHeaders = headerParameters.reduce(parametersToKeyValue, {});
 				} else if (specifyHeaders === 'json') {
 					// body is specified using JSON
 					try {
@@ -1269,8 +1275,12 @@ export class HttpRequestV3 implements INodeType {
 						);
 					}
 
-					requestOptions.headers = jsonParse(jsonHeadersParameter);
+					additionalHeaders = jsonParse(jsonHeadersParameter);
 				}
+				requestOptions.headers = {
+					...requestOptions.headers,
+					...keysToLowercase(additionalHeaders),
+				};
 			}
 
 			if (autoDetectResponseFormat || responseFormat === 'file') {
@@ -1290,7 +1300,7 @@ export class HttpRequestV3 implements INodeType {
 					requestOptions.headers = {};
 				}
 				const rawContentType = this.getNodeParameter('rawContentType', itemIndex) as string;
-				requestOptions.headers['Content-Type'] = rawContentType;
+				requestOptions.headers['content-type'] = rawContentType;
 			}
 
 			const authDataKeys: IAuthDataSanitizeKeys = {};
@@ -1338,7 +1348,6 @@ export class HttpRequestV3 implements INodeType {
 			try {
 				this.sendMessageToUI(sanitizeUiMessage(requestOptions, authDataKeys));
 			} catch (e) {}
-
 			if (authentication === 'genericCredentialType' || authentication === 'none') {
 				if (oAuth1Api) {
 					const requestOAuth1 = this.helpers.requestOAuth1.call(this, 'oAuth1Api', requestOptions);

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);
+	});
+});

packages/nodes-base/utils/utilities.ts

@@ -172,3 +172,11 @@ export const fuzzyCompare = (useFuzzyCompare: boolean, compareVersion = 1) => {
 		return isEqual(item1, item2);
 	};
 };
+
+export const keysToLowercase = <T>(headers: T) => {
+	if (typeof headers !== 'object' || Array.isArray(headers) || headers === null) return headers;
+	return Object.entries(headers).reduce((acc, [key, value]) => {
+		acc[key.toLowerCase()] = value;
+		return acc;
+	}, {} as IDataObject);
+};