如何在Angular 8中正确实现HTTP拦截器？

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

@Injectable()
export class MyInterceptor implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // 在请求之前进行处理，例如添加身份验证标头
    const modifiedRequest = request.clone({
      headers: request.headers.set('Authorization', 'Bearer my-token')
    });

    // 将修改后的请求传递给下一个拦截器或最终的HTTP处理程序
    return next.handle(modifiedRequest);
  }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';

import { AppComponent } from './app.component';
import { MyInterceptor } from './my-interceptor';

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule, HttpClientModule],
  providers: [
    { provide: HTTP_INTERCEPTORS, useClass: MyInterceptor, multi: true }
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}