method Headers.prototype.forEachimport { Headers } from "https://deno.land/x/deno@v1.28.0/ext/fetch/lib.deno_fetch.d.ts"; forEach(callbackfn: (value: string,key: string,parent: this,) => void, thisArg?: any): voidParameterscallbackfn: (value: string,key: string,parent: this,) => voidoptionalthisArg: anyReturnsvoid