fix(HTTP Request Node): Duplicate key names support for form data (#9040)

Co-authored-by: Marcus <marcus@n8n.io>

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

@@ -7,7 +7,13 @@ import type {
 
 import set from 'lodash/set';
 
-export type BodyParameter = { name: string; value: string };
+import FormData from 'form-data';
+
+export type BodyParameter = {
+	name: string;
+	value: string;
+	parameterType?: 'formBinaryData' | 'formData';
+};
 
 export type IAuthDataSanitizeKeys = {
 	[key: string]: string[];
@@ -168,6 +174,22 @@ export const prepareRequestBody = async (
 			set(result, entry.name, entry.value);
 			return result;
 		}, Promise.resolve({}));
+	} else if (bodyType === 'multipart-form-data' && version >= 4.2) {
+		const formData = new FormData();
+
+		for (const parameter of parameters) {
+			if (parameter.parameterType === 'formBinaryData') {
+				const entry = await defaultReducer({}, parameter);
+				const key = Object.keys(entry)[0];
+				const data = entry[key] as { value: Buffer; options: FormData.AppendOptions };
+				formData.append(key, data.value, data.options);
+				continue;
+			}
+
+			formData.append(parameter.name, parameter.value);
+		}
+
+		return formData;
 	} else {
 		return await reduceAsync(parameters, defaultReducer);
 	}

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

@@ -14,7 +14,7 @@ export class HttpRequest extends VersionedNodeType {
 			group: ['output'],
 			subtitle: '={{$parameter["requestMethod"] + ": " + $parameter["url"]}}',
 			description: 'Makes an HTTP request and returns the response data',
-			defaultVersion: 4.1,
+			defaultVersion: 4.2,
 		};
 
 		const nodeVersions: IVersionedNodeType['nodeVersions'] = {
@@ -23,6 +23,7 @@ export class HttpRequest extends VersionedNodeType {
 			3: new HttpRequestV3(baseDescription),
 			4: new HttpRequestV3(baseDescription),
 			4.1: new HttpRequestV3(baseDescription),
+			4.2: new HttpRequestV3(baseDescription),
 		};
 
 		super(nodeVersions, baseDescription);

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

@@ -49,7 +49,7 @@ export class HttpRequestV3 implements INodeType {
 		this.description = {
 			...baseDescription,
 			subtitle: '={{$parameter["method"] + ": " + $parameter["url"]}}',
-			version: [3, 4, 4.1],
+			version: [3, 4, 4.1, 4.2],
 			defaults: {
 				name: 'HTTP Request',
 				color: '#0004F5',