Examples of making fetch requests from within your Worker script including generating JSON post requests then reading in the resulting response body, aggregating multiple requests into one response, and following/catching redirects.
index.js is the content of the Workers script.
Live Demos are hosted on workers-tooling.cf/demos/fetch:
Demo JSON | Demo HTML
To generate using wrangler
wrangler generate myApp https://github.com/cloudflare/worker-template-fetch
To deploy using serverless add a serverless.yml file.