import { hasBody } from "https://deno.land/x/opine@2.2.0/deps.ts";
Check if a request's header has a request body.
A request with a body must either have transfer-encoding
or content-length
headers set.
http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.3
Parameters
header: Headers