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@Injectable()
export class HttpInterceptingHandler implements HttpHandler {
private chain: HttpHandler|null = null;
constructor(private backend: HttpBackend, private injector: Injector) {}
handle(req: HttpRequest<any>): Observable<HttpEvent<any>> {
if (this.chain === null) {
const interceptors = this.injector.get(HTTP_INTERCEPTORS, []);
this.chain = interceptors.reduceRight(
(next, interceptor) => new HttpInterceptorHandler(next, interceptor), this.backend);
}
return this.chain.handle(req);
}
}
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