Deploying the OpenClaw Rating API on AWS Edge Services

1. Introduction

OpenClaw is a lightweight, vendor‑agnostic rating engine that can be exposed as a RESTful API. When you push the API to the edge, you gain sub‑second response times, automatic global scaling, and a pay‑as‑you‑go cost model. This guide walks developers and DevOps engineers through a complete, production‑ready deployment on AWS using Amazon S3, CloudFront, and Lambda@Edge. We also cover latency‑ and cost‑optimization best practices so you can keep your bill predictable while delivering a snappy user experience.

2. Prerequisites

• A valid AWS account with AdministratorAccess or equivalent IAM permissions.
• A recent version of the AWS CLI installed and configured.
• Node.js ≥ 14 (for building Lambda@Edge functions).
• Git for source control (optional but recommended).
• The OpenClaw source code or a compiled openclaw.zip package.

3. Setting up the Amazon S3 bucket

The S3 bucket stores the static files (HTML, CSS, JavaScript) that the API may need to serve, as well as the Lambda deployment package.

3.1 Create the bucket

aws s3api create-bucket \
    --bucket openclaw-edge-assets \
    --region us-east-1 \
    --create-bucket-configuration LocationConstraint=us-east-1

3.2 Apply a bucket policy for public read (optional)

If you need to serve static assets directly from S3, attach a policy that allows s3:GetObject on the bucket.

aws s3api put-bucket-policy \
    --bucket openclaw-edge-assets \
    --policy '{
      "Version":"2012-10-17",
      "Statement":[{
        "Sid":"PublicReadGetObject",
        "Effect":"Allow",
        "Principal":"*",
        "Action":["s3:GetObject"],
        "Resource":["arn:aws:s3:::openclaw-edge-assets/*"]
      }]
    }'

3.3 Upload the Lambda package

Package your Lambda code (including node_modules) into a zip file and upload it.

zip -r openclaw-lambda.zip index.js node_modules
aws s3 cp openclaw-lambda.zip s3://openclaw-edge-assets/

4. Configuring CloudFront distribution

CloudFront is the CDN that will route requests to the nearest edge location and invoke your Lambda@Edge functions.

4.1 Create a basic distribution

Use the AWS CLI or console. Below is a minimal JSON configuration for the CLI.

aws cloudfront create-distribution \
    --distribution-config '{
      "CallerReference":"openclaw-$(date +%s)",
      "Origins":{
        "Quantity":1,
        "Items":[{
          "Id":"S3-openclaw",
          "DomainName":"openclaw-edge-assets.s3.amazonaws.com",
          "S3OriginConfig":{"OriginAccessIdentity":""}
        }]
      },
      "DefaultCacheBehavior":{
        "TargetOriginId":"S3-openclaw",
        "ViewerProtocolPolicy":"redirect-to-https",
        "AllowedMethods":{"Quantity":2,"Items":["GET","HEAD"]},
        "ForwardedValues":{
          "QueryString":true,
          "Headers":{"Quantity":0},
          "Cookies":{"Forward":"none"}
        },
        "LambdaFunctionAssociations":{
          "Quantity":1,
          "Items":[{
            "LambdaFunctionARN":"arn:aws:lambda:us-east-1:123456789012:function:OpenClawViewerRequest",
            "EventType":"viewer-request",
            "IncludeBody":false
          }]
        }
      },
      "Enabled":true,
      "Comment":"OpenClaw Edge Deployment"
    }'

4.2 Enable HTTP/2 and IPv6

Both protocols reduce latency for modern browsers. In the console, toggle HTTP/2 and IPv6 under the General tab.

4.3 Set up a custom domain (optional)

If you own api.example.com, create an ACM certificate in us-east-1 and attach it to the distribution.

5. Deploying Lambda@Edge functions

Lambda@Edge runs your code in AWS locations worldwide. You need two functions: one for request validation (viewer-request) and one for response manipulation (origin-response).

5.1 Create the request‑validation function

Save the following as viewer-request.js:

exports.handler = async (event) => {
  const { request } = event.Records[0].cf;
  // Simple API key check
  const apiKey = request.headers['x-api-key'] ? request.headers['x-api-key'][0].value : null;
  if (!apiKey || apiKey !== process.env.OPENCLAW_API_KEY) {
    return {
      status: '403',
      statusDescription: 'Forbidden',
      body: JSON.stringify({ error: 'Invalid API key' }),
      headers: { 'content-type': [{ key: 'Content-Type', value: 'application/json' }] }
    };
  }
  // Forward request to origin (S3 or custom origin)
  return request;
};

5.2 Create the response‑enhancement function

This function adds CORS headers and caches successful responses for 60 seconds.

exports.handler = async (event) => {
  const { response } = event.Records[0].cf;
  // Add CORS
  response.headers['access-control-allow-origin'] = [{ key: 'Access-Control-Allow-Origin', value: '*' }];
  response.headers['access-control-allow-methods'] = [{ key: 'Access-Control-Allow-Methods', value: 'GET,POST,OPTIONS' }];
  // Cache control
  if (response.status === '200') {
    response.headers['cache-control'] = [{ key: 'Cache-Control', value: 'max-age=60' }];
  }
  return response;
};

5.3 Package and publish each function

For each file, create a zip and publish to the us-east-1 region (required for Lambda@Edge).

zip viewer-request.zip viewer-request.js
aws lambda publish-version \
    --function-name OpenClawViewerRequest \
    --zip-file fileb://viewer-request.zip \
    --region us-east-1

zip origin-response.zip origin-response.js
aws lambda publish-version \
    --function-name OpenClawOriginResponse \
    --zip-file fileb://origin-response.zip \
    --region us-east-1

5.4 Replicate to edge locations

After publishing, add the ARN (including the version number) to the CloudFront distribution under Lambda Function Associations. The console will automatically replicate the code to edge locations—a process that can take 5‑10 minutes.

6. Integrating the OpenClaw Rating API

With the edge infrastructure in place, you only need to call the API endpoint that CloudFront exposes.

6.1 Example request (cURL)

curl -X POST https://d1234abcdefg.cloudfront.net/rate \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_OPENCLAW_API_KEY" \
  -d '{"itemId":"product-42","rating":4.5}'

6.2 Handling responses

The Lambda@Edge origin-response function ensures the payload is JSON‑encoded and includes CORS headers, so front‑end frameworks (React, Vue, Angular) can consume it directly.

6.3 Deploying a sample front‑end

Store a simple HTML/JS page in the same S3 bucket. The page can call the edge API without a server‑side proxy.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>OpenClaw Demo</title>
</head>
<body>
  <button id="rateBtn">Rate Product</button>
  <script>
    document.getElementById('rateBtn').addEventListener('click', async () => {
      const resp = await fetch('https://d1234abcdefg.cloudfront.net/rate', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'x-api-key': 'YOUR_OPENCLAW_API_KEY'
        },
        body: JSON.stringify({ itemId: 'product-42', rating: 5 })
      });
      const data = await resp.json();
      console.log('Rating response:', data);
    });
  </script>
</body>
</html>

Upload this file to the bucket and invalidate the CloudFront cache to make it instantly available.

7. Best‑practice tips for latency and cost optimization

7.5 Security and compliance

Store the OpenClaw API key in Lambda environment variables encrypted with KMS. Use IAM policies that grant the Lambda function read‑only access to the S3 bucket and no internet egress unless required.

For a turnkey hosting experience that abstracts the edge complexity while still giving you full control, consider the OpenClaw hosting solution on UBOS. It bundles S3, CloudFront, and Lambda@Edge into a single click deployment.

8. Conclusion

Deploying the OpenClaw Rating API on AWS Edge services transforms a simple rating engine into a globally distributed, low‑latency, cost‑effective micro‑service. By following the step‑by‑step instructions above, you gain:

• Sub‑second response times thanks to Lambda@Edge execution at the edge.
• Automatic scaling without capacity planning.
• Fine‑grained control over caching, security, and cost.
• A reusable pattern you can apply to any RESTful API you wish to push to the edge.

Start with the guide, iterate on the best‑practice tips, and watch your API performance soar while your AWS bill stays predictable.