n8n-io/n8n · error · NodeOperationError

Can't use a placeholder for the domain when using authentica

Error message

Can't use a placeholder for the domain when using authentication

What it means

Error "Can't use a placeholder for the domain when using authentication" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/nodes-langchain/nodes/tools/ToolHttpRequest/ToolHttpRequest.node.ts:300

			headers: {
				// FIXME: This is a workaround to prevent the node from sending a default User-Agent (`n8n`) when the header is not set.
				//  Needs to be replaced with a proper fix after NODE-1777 is resolved
				'User-Agent': undefined,
			},
			body: {},
			// We will need a full response object later to extract the headers and check the response's content type.
			returnFullResponse: true,
		};

		const authentication = this.getNodeParameter('authentication', itemIndex, 'none') as
			| 'predefinedCredentialType'
			| 'genericCredentialType'
			| 'none';

		if (authentication !== 'none') {
			const domain = new URL(requestOptions.url).hostname;
			if (domain.includes('{') && domain.includes('}')) {
				throw new NodeOperationError(
					this.getNode(),
					"Can't use a placeholder for the domain when using authentication",
					{
						itemIndex,
						description:
							'This is for security reasons, to prevent the model accidentally sending your credentials to an unauthorized domain',
					},
				);
			}
		}

		const httpRequest = await configureHttpRequestFunction(this, authentication, itemIndex);
		const optimizeResponse = configureResponseOptimizer(this, itemIndex);

		const rawRequestOptions: { [key: string]: string } = {
			qs: '',
			headers: '',
			body: '',

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/nodes-langchain/nodes/tools/ToolHttpRequest/ToolHttpRequest.node.ts:300 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/0c6e794aac353e4f. Report an issue: GitHub.