paperless-ngx/src-ui/src/app/interceptors/api-version.interceptor.ts

import {
  HttpEvent,
  HttpHandler,
  HttpInterceptor,
  HttpRequest,
} from '@angular/common/http'
import { Injectable } from '@angular/core'
import { Observable } from 'rxjs'
import { environment } from 'src/environments/environment'

@Injectable()
export class ApiVersionInterceptor implements HttpInterceptor {
  constructor() {}

  intercept(
    request: HttpRequest<unknown>,
    next: HttpHandler
  ): Observable<HttpEvent<unknown>> {
    request = request.clone({
      setHeaders: {
        Accept: `application/json; version=${environment.apiVersion}`,
      },
    })

    return next.handle(request)
  }
}