fetch(url, options)

This is based on the standard JavaScript fetch method, with these differences:

1. If the server successfully returns a Response object, this calls the arrayBuffer() on the Response and returns the ArrayBuffer result. You can use that ArrayBuffer as is. If you want to convert it to text, pass it to Origami.string.
2. If the url ends in an file extension for a known file type, Origami will attach an unpack method to the returned ArrayBuffer. You can invoke that method to process the content using the handler associated with that file extension. Additionally, when called in Origami code, you can access data properties directly from the result of the Origami.fetch call.

Example: if a given URL returns a YAML resource:

$ ori https://weborigami.org/samples/cli/greetings.yaml
Alice: Hello, Alice.
Bob: Hello, Bob.
Carol: Hello, Carol.

Then these commands are equivalent:

$ ori "Origami.fetch('https://weborigami.org/samples/cli/greetings.yaml').Alice"
Hello, Alice.
$ ori "(https://weborigami.org/samples/cli/greetings.yaml).Alice"
Hello, Alice.

Because Origami automatically evaluates a URL in an Origami expression, it is not generally necessarily to call Origami.fetch. However, Origami.fetch may be useful in certain cases like using a Tree.map to extract a set of URLs from data and then fetch the corresponding resources.