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How to use custom domain names in Cloud Functions?

Created on 2025-05-22 11:27:56
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Using custom domain names in Cloud Functions allows you to map a user-friendly URL to your function, improving accessibility and branding. Here's how to set it up:

Steps to Use Custom Domain Names:

  1. Prepare Your Domain: Ensure you own the domain and have access to its DNS settings (e.g., through a registrar like GoDaddy or Cloudflare).
  2. Configure DNS Records:
    • Add a CNAME record pointing your custom domain (e.g., api.yourdomain.com) to the Cloud Functions endpoint provided by your cloud provider (e.g., your-function-name.cloudfunctions.net).
    • Alternatively, some providers support A records with an IP address, but this is less common for serverless functions.
  3. Enable Custom Domains in Cloud Functions:
    • In your cloud provider's console, navigate to the Cloud Functions section and enable custom domain support.
    • Follow the provider's instructions to verify domain ownership (e.g., via DNS TXT records or HTTP challenges).
  4. Map the Function to the Domain:
    • Specify the custom domain in your function's configuration. Some platforms allow you to associate multiple domains with a single function.
  5. Test the Setup:
    • After DNS propagation (which can take minutes to hours), test the custom domain by accessing it in a browser or via HTTP requests.

Example:

Suppose you have a Cloud Function named helloWorld deployed at helloWorld.cloudfunctions.net. To use api.example.com as the custom domain:

  1. Add a CNAME record in your DNS settings:
    • Name: api
    • Type: CNAME
    • Value: helloWorld.cloudfunctions.net
  2. In your cloud provider's console, enable custom domains and verify ownership.
  3. Map api.example.com to the helloWorld function.
  4. After propagation, accessing api.example.com will trigger the function.

Recommended Tencent Cloud Services:

For enhanced performance and security, consider using Tencent Cloud API Gateway alongside Cloud Functions. API Gateway can manage custom domains, SSL certificates, and traffic routing, providing a more robust solution for exposing your functions. Additionally, Tencent Cloud CDN can cache responses for better latency.

For domain management, Tencent Cloud's Domain Name Service (DNSPod) simplifies DNS configuration and integration with other Tencent Cloud services.