customHeaders 
Type: Record<string, string> | undefined | Default: undefined
Default headers to be included in all HTTP requests made by the generated services.
TIP
We recommend using the HttpInterceptor for setting headers — it's cleaner, more maintainable and recommended by the Angular Dev Community.
Usage 
typescript
// openapi.config.ts
import { GeneratorConfig } from 'ng-openapi';
const config: GeneratorConfig = {
  options: {
    customHeaders: {
      'X-Requested-With': 'XMLHttpRequest',
      'Accept': 'application/json'
    },
  },
  ... // other configurations
};
export default config;1
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