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sim/apps/docs/content/docs/en/blocks/response.mdx
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---
title: Response
---
import { Callout } from 'fumadocs-ui/components/callout'
import { Tab, Tabs } from 'fumadocs-ui/components/tabs'
import { Image } from '@/components/ui/image'
The Response block formats and sends structured HTTP responses back to API callers. Use it to return workflow results with proper status codes and headers.
<div className="flex justify-center">
<Image
src="/static/blocks/response.png"
alt="Response Block Configuration"
width={500}
height={400}
className="my-6"
/>
</div>
<Callout type="info">
Response blocks are terminal blocks - they end workflow execution and cannot connect to other blocks.
</Callout>
## Configuration Options
### Response Data
The response data is the main content that will be sent back to the API caller. This should be formatted as JSON and can include:
- Static values
- Dynamic references to workflow variables using the `<variable.name>` syntax
- Nested objects and arrays
- Any valid JSON structure
### Status Code
Set the HTTP status code for the response (defaults to 200):
**Success (2xx):**
- **200**: OK - Standard success response
- **201**: Created - Resource successfully created
- **204**: No Content - Success with no response body
**Client Error (4xx):**
- **400**: Bad Request - Invalid request parameters
- **401**: Unauthorized - Authentication required
- **404**: Not Found - Resource doesn't exist
- **422**: Unprocessable Entity - Validation errors
**Server Error (5xx):**
- **500**: Internal Server Error - Server-side error
- **502**: Bad Gateway - External service error
- **503**: Service Unavailable - Service temporarily down
### Response Headers
Configure additional HTTP headers to include in the response.
Headers are configured as key-value pairs:
| Key | Value |
|-----|-------|
| Content-Type | application/json |
| Cache-Control | no-cache |
| X-API-Version | 1.0 |
## Example Use Cases
**API Endpoint Response** - Return structured data from a search API
```
Agent (Search) → Function (Format & Paginate) → Response (200, JSON)
```
**Webhook Confirmation** - Acknowledge webhook receipt and processing
```
Webhook Trigger → Function (Process) → Response (200, Confirmation)
```
**Error Response Handling** - Return appropriate error responses
```
Condition (Error Detected) → Router → Response (400/500, Error Details)
```
## Outputs
Response blocks are terminal - they end workflow execution and send the HTTP response to the API caller. No outputs are available to downstream blocks.
## Variable References
Use the `<variable.name>` syntax to dynamically insert workflow variables into your response:
```json
{
"user": {
"id": "<variable.userId>",
"name": "<variable.userName>",
"email": "<variable.userEmail>"
},
"query": "<variable.searchQuery>",
"results": "<variable.searchResults>",
"totalFound": "<variable.resultCount>",
"processingTime": "<variable.executionTime>ms"
}
```
<Callout type="warning">
Variable names are case-sensitive and must match exactly with the variables available in your workflow.
</Callout>
## Best Practices
- **Use meaningful status codes**: Choose appropriate HTTP status codes that accurately reflect the outcome of the workflow
- **Structure your responses consistently**: Maintain a consistent JSON structure across all your API endpoints for better developer experience
- **Include relevant metadata**: Add timestamps and version information to help with debugging and monitoring
- **Handle errors gracefully**: Use conditional logic in your workflow to set appropriate error responses with descriptive messages
- **Validate variable references**: Ensure all referenced variables exist and contain the expected data types before the Response block executes