•fetch — Fetch a URL

•fetch url requests url and returns a record of the response: status, a number; headers, a record of text; and body, the response’s text. A missing page gives a result with status 404, not an error. Header names are in lower case, and a repeated header’s values are joined with ,. •fetch follows redirects. Natively it runs the system’s curl, which must be installed. In the browser it makes the request from the page, and the server’s CORS rules apply. •json (•fetch url).body reads a JSON response.

X •fetch url takes options on the left: method, which is "GET", or "POST" with a body; headers, a record of text; body, text or bytes to send; and binary (1 gives the body as a vector of byte values).

Errors: IO for getting no response, such as for an unknown host or a refused connection, for a missing curl, and for a body that isn’t UTF-8 without binary; DOMAIN for invalid options.