https://edgio-community-examples-polyfill.io-replace-live.edgio.link/
This repository provides example code for transforming HTML content using Edge Functions. It includes a specific example of replacing polyfill.io script URLs with a different third-party CDN (cdnjs.cloudflare.com) to serve polyfills, enhancing security and performance. The code modifies the content using the HtmlTransformer class and streams responses to the transformer.
NOTE: To use this project, you must be an Edgio customer and signed up for the Edge Functions. See our Edge Functions documentation for information on activating this feature.
The system requirements include Node.js v18 or higher and a UNIX-like system (Linux or macOS). The project code is written in JavaScript.
- Ensure you meet the prerequisites.
- Clone the repository to your local machine.
- Run
npm installin the repository directory.
After setting up the project, run npm run edgio:dev to start a local development server to test the example functions.
To deploy the project to Edgio, use the command npm run edgio:deploy. Note that deployment to Edgio requires you to be
logged into Edgio CLI which can be done via npm run edgio login and following the instructions.
In light of recent discussions on potential supply chain attacks targeting polyfill services, it is crucial to mitigate the risks associated with relying on third-party scripts. By replacing polyfill.io URLs with those from a trusted CDN, this edge function helps protect your application from vulnerabilities that could be exploited through less secure or compromised content delivery networks.
If you have any queries or face issues with this project, please don't hesitate to contact the Edgio team.
Creative Commons Attribution 4.0 International Public License for the documentation.
MIT License for the code.