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Webhooks provide instant notifications when your video generation tasks complete or fail. No more polling!

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Setup Guide

1

Create Webhook Endpoint

Set up an HTTPS endpoint that can receive POST requests.
from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/webhook', methods=['POST'])
def handle_webhook():
    data = request.json
    
    if data['status'] == 'completed':
        print(f"Video ready: {data['video_url']}")
    else:
        print(f"Generation failed: {data['generation_id']}")
        
    return jsonify({'status': 'received'}), 200
2

Add Webhook URL

Include your webhook URL when creating a generation task.
curl -X POST https://platform.runblob.io/v1/kling/generate \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A sunset over mountains",
    "callback_url": "https://your-app.com/webhook"
  }'
3

Handle Notifications

Your endpoint will receive instant notifications when tasks complete.

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Payload Structure

  • Success
  • Failed
Sent when video generation completes successfully.
{
  "generation_id": "550e8400-e29b-41d4-a716-446655440000",
  "status": "completed",
  "video_url": "https://cdn.runblob.io/videos/550e8400.mp4",
  "completed_at": "2025-11-22T10:32:15Z"
}
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generation_id
string
UUID of the completed task
​
status
string
Always "completed" for successful generations
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video_url
string
Direct download URL for the generated video
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completed_at
string
ISO 8601 time of completion

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Reliability Features

Retry Policy: Up to 5 attempts with exponential backoffBackoff Strategy: 30 seconds, 60 seconds, 120 seconds, 240 seconds, 480 secondsFailure Handling: After 5 failed attempts, the webhook is marked as failed
Request Timeout: 30 seconds per webhook requestConnection Timeout: 10 seconds to establish connectionBest Practice: Respond quickly with a 200 status code
HTTPS Required: All webhook URLs must use HTTPSIP Allowlist: Consider restricting access to RunBlob’s IP rangesValidation: Always validate the generation_id in your webhook handler

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Example Implementations

from flask import Flask, request, jsonify
import logging

app = Flask(__name__)
logging.basicConfig(level=logging.INFO)

@app.route('/webhook', methods=['POST'])
def kling_webhook():
    try:
        data = request.json
        generation_id = data.get('generation_id')
        
        if data.get('status') == 'completed':
            video_url = data.get('video_url')
            logging.info(f"Video ready for {generation_id}: {video_url}")
            # Process successful generation
            process_video(generation_id, video_url)
        else:
            logging.error(f"Generation failed for {generation_id}")
            # Handle failure
            handle_failure(generation_id)
        
        return jsonify({'status': 'received'}), 200
    except Exception as e:
        logging.error(f"Webhook error: {str(e)}")
        return jsonify({'error': 'Internal error'}), 500

def process_video(generation_id, video_url):
    # Your video processing logic here
    pass

def handle_failure(generation_id):
    # Your error handling logic here
    pass
Important: Always return a 200 status code quickly to acknowledge receipt. Perform heavy processing asynchronously to avoid timeouts.