method RequestBuilder.prototype.headerRe-exportimport { RequestBuilder } from "https://deno.land/x/dax@0.32.0/mod.ts"; header(items: Record<string, string | undefined>): RequestBuilderSets multiple headers at the same time via an object literal. header(name: string, value: string | undefined): RequestBuilderSets a header to send with the request. Sets multiple headers at the same time via an object literal. Parametersitems: Record<string, string | undefined>ReturnsRequestBuilderSets a header to send with the request. Parametersname: stringvalue: string | undefinedReturnsRequestBuilder