ssr build - Angular 8中ngOnInit拦截器的使用

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

@Injectable()
export class CustomInterceptor implements HttpInterceptor {

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // 克隆请求并在其头部添加自定义头
    const modifiedReq = req.clone({
      headers: req.headers.set('X-Custom-Header', 'custom-value')
    });

    return next.handle(modifiedReq).pipe(
      catchError((error: HttpErrorResponse) => {
        // 在这里处理错误，例如显示错误消息或重试请求
        console.error('An error occurred:', error);
        return throwError(error);
      })
    );
  }
}

import { NgModule } from '@angular/core';
import { HTTP_INTERCEPTORS } from '@angular/common/http';
import { CustomInterceptor } from './custom.interceptor';

@NgModule({
  // ...
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: CustomInterceptor,
      multi: true
    }
  ],
  // ...
})
export class AppModule { }