method OutgoingMessage.prototype.getHeader Usage in Deno```typescript import { OutgoingMessage } from "node:node__http.d.ts"; ``` OutgoingMessage.prototype.getHeader(name: string): number | string | string[] | undefined Gets the value of the HTTP header with the given name. If that header is not set, the returned value will be `undefined`. Parameters name: string Name of header Return Type number | string | string[] | undefined