在Angular HttpInterceptor中添加是否向req.clone添加headers的逻辑

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

@Injectable()
export class HeaderInterceptorService implements HttpInterceptor {
  intercept(req: HttpRequest<any>, next: HttpHandler) {
    // 判断是否需要添加headers的逻辑
    if (/* 添加headers的条件 */) {
      // 使用req.clone方法创建一个新的HttpRequest对象，并添加headers
      const headers = new HttpHeaders().set('Authorization', 'Bearer token');
      const clonedReq = req.clone({ headers });
      return next.handle(clonedReq);
    } else {
      return next.handle(req);
    }
  }
}

import { HTTP_INTERCEPTORS } from '@angular/common/http';
import { HeaderInterceptorService } from './header-interceptor.service';

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