如何让angular模块忽略核心模块中添加的http拦截器

Question

我确实有一个带有用于授权处理的HttpInterceptor的核心模块，并且我在AppModule中包含了这个模块，通过这种方式，所有其他使用HttpClient的模块都在使用这个拦截器。

@NgModule({
  imports: [],
  declarations: [],
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: AuthInterceptor,
      multi: true,
    },
  ]
})
export class CoreModule { }

如何让模块绕过默认拦截器？

@NgModule({
  imports: [
    CommonModule
  ],
  declarations: components,
  providers: [CustomService],
  exports: components,
})
export class ModuleWithoutInterceptorModule { }

Answer 1

您可以使用HttpBackend。

示例：

import { HttpClient, ..., HttpBackend } from '@angular/common/http';

@Injectable()
export class TestService {

  private httpClient: HttpClient;

  constructor( handler: HttpBackend) { 
     this.httpClient = new HttpClient(handler);
  }
....

这样，服务就不会被AuthInterceptor拦截。

Answer 2

根据GitHub上的this suggestion，我们实现了一个简单的头部来识别不应该被拦截的请求。在拦截器中：

export const InterceptorSkipHeader = 'X-Skip-Interceptor';

@Injectable()
export class SkippableInterceptor implements HttpInterceptor {

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    if (req.headers.has(InterceptorSkipHeader)) {
      const headers = req.headers.delete(InterceptorSkipHeader);
      return next.handle(req.clone({ headers }));
    }

    ...  // intercept
  }

}

然后，每当您想要跳过对特定请求的拦截时：

const headers = new HttpHeaders().set(InterceptorSkipHeader, '');

this.httpClient
    .get<ResponseType>(someUrl, { headers })
    ...

请注意，使用此方法时，选择何时应用拦截器逻辑的是服务，而不是拦截器；这意味着服务必须“了解”应用程序中拦截器的某些信息。根据您的用例，让拦截器决定何时应用逻辑可能更好。

Answer 3

为了绕过所有拦截器，我们可以按照@deg的建议使用HttpBackend。

在其他情况下，我们可以创建HttpClient工厂，允许我们从拦截器链中排除拦截器：

import { createHttpClient } from './http-client.factory';
// ...

@Injectable({
  providedIn: 'root'
})
export class TodosApiService {
  http = createHttpClient(this.injector, [Interceptor2]);
//                                        ^^^^^^^^^^^^
//                                    Interceptors to exclude

  constructor(private injector: Injector) { }

  getTodo() {
    // Interceptor2 will be bypassed
    return this.http.get('https://jsonplaceholder.typicode.com/todos')
  }
}

请注意，您可以通过创建基类来重用此逻辑：

@Injectable()
export class BasicHttpClient {
  protected http = createHttpClient(this.injector, [Interceptor2]);

  constructor(private injector: Injector) { }
}

@Injectable({ providedIn: 'root' })
export class TodosApiService extends BaseHttpClient {

  getTodo() {
    // Interceptor2 will be bypassed
    return this.http.get('https://jsonplaceholder.typicode.com/todos')
  }
}

http-client.factory.ts

import {
  HTTP_INTERCEPTORS,
  HttpBackend,
  HttpClient,
  HttpEvent,
  HttpHandler,
  HttpInterceptor,
  HttpRequest,
} from '@angular/common/http';
import { Observable } from 'rxjs';
import { Injector, Type } from '@angular/core';

class HttpInterceptorHandler implements HttpHandler {
  constructor(private next: HttpHandler, private interceptor: HttpInterceptor) {}

  handle(req: HttpRequest<any>): Observable<HttpEvent<any>> {
    return this.interceptor.intercept(req, this.next);
  } 
}

class HttpInterceptingHandler implements HttpHandler {
  private chain: HttpHandler | null = null;

  constructor(
    private backend: HttpBackend,
    private injector: Injector,
    private interceptorsToExclude: Type<HttpInterceptor>[],
    private intercept?: (req: HttpRequest<any>) => HttpRequest<any>
  ) {}

  handle(req: HttpRequest<any>): Observable<HttpEvent<any>> {
    if (this.intercept) {
      req = this.intercept(req);
    }

    if (this.chain === null) {
      const interceptors = this.injector
        .get(HTTP_INTERCEPTORS, [])
        .filter(
          interceptor => !this.interceptorsToExclude.some(interceptorType => interceptor instanceof interceptorType)
        );

      this.chain = interceptors.reduceRight(
        (next, interceptor) => new HttpInterceptorHandler(next, interceptor),
        this.backend
      );
    }
    return this.chain.handle(req);
  }
}

export function createHttpClient(
  injector: Injector,
  excludedInterceptors: Type<HttpInterceptor>[],
  intercept?: (req: HttpRequest<any>) => HttpRequest<any>
) {
  return new HttpClient(
    new HttpInterceptingHandler(injector.get(HttpBackend), injector, excludedInterceptors, intercept)
  );
}