JSONP Highlight plugin doesn't handle 301 redirects

Information:

• Prism version: 1.24.1
• Plugins: jsonp-highlight
• Environment: Browser

Description

The example below is the minimal example from the docs:

<pre
	class="language-javascript"
	data-jsonp="https://api.github.com/repos/leaverou/prism/contents/prism.js">
</pre>

... which for me resulted in the following being rendered:

✖ Error: Cannot parse response (perhaps you need an adapter function?)

Debugging the error with the dev tools reveals that the problem is the 301 response:

As soon as I change data-jsonp to the redirect location https://api.github.com/repositories/4979467/contents/prism.js?callback=prismjsonp0, everything works as expected.

Solution

• Handle 301 status codes
• Temporarily update the minimal example in the docs with an URL that returns a status code 400, so people don't get confused

Start with the jsonp-highlight plugin entry point and the minimal JSONP example in the documentation. Reproduce the request using the documented GitHub URL and inspect how the 301 response is handled. Done means redirected responses work and the documentation example no longer points to a confusing URL.