我正在使用Angular 6,问题是当我尝试将拦截器与APP_INITIALIZER一起用作应用程序模块提供程序以从本地获取json配置文件时。
我的应用程序模块片段是:
../ src / app / app.module.ts(提供者片段)
providers: [
AppConfigService,
{
provide: APP_INITIALIZER,
useFactory: initializeApp,
deps: [AppConfigService], multi: true
},
{ provide: HTTP_INTERCEPTORS, useClass: TokenInterceptor, multi: true },
{ provide: LOCALE_ID, useValue: 'ES' },
Title,
]
有趣的是,如果我删除了拦截器,则代码可以很好地带来配置文件。我获取配置文件的代码是:
../ src / app / _services / app-config.service.ts
import { Injectable } from '@angular/core';
import { Response } from '@angular/http';
import { HttpClient } from '@angular/common/http';
import { environment } from '../../environments/environment.dev';
import { IAppConfig } from '../_models/_interfaces/app-config.model';
@Injectable()
export class AppConfigService {
static settings: IAppConfig;
constructor(private http: HttpClient) {}
load() {
const jsonFile = `../../assets/config/config.${environment.name}.json`;
return new Promise<void>((resolve, reject) => {
this.http.get(jsonFile).toPromise().then((response: Response) => {
AppConfigService.settings = <IAppConfig>response;
resolve();
}).catch((response: any) => {
reject(`Could not load file '${jsonFile}': ${JSON.stringify(response)}`);
});
});
}
}
最后,拦截器代码:
../ src / app / _interceptors / token.interceptor.ts
import {
HttpRequest,
HttpHandler,
HttpEvent,
HttpInterceptor
} from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import { AuthService } from '../_services/auth.service';
@Injectable()
export class TokenInterceptor implements HttpInterceptor {
constructor(public auth: AuthService) {}
intercept(request: HttpRequest<any>, next: HttpHandler):
Observable<HttpEvent<any>> {
request = request.clone({
setHeaders: {
Authorization: `Bearer ${this.auth.getToken()}`
}
});
return next.handle(request);
}
}
当Angular编译应用程序时,它返回:
无法加载文件'../../assets/config/config.dev.json':{}
我尝试了几种方法来避免此问题,但直到现在仍无法解决。
有什么建议吗?
谢谢。
答案 0 :(得分:2)
当您使用HttpClient获取配置文件时,拦截器也会过滤该请求。在您的代码中,拦截器正在用Authorization标头替换(不附加到现有的所有HTTP标头)。当默认的Content-Type application / json丢失时,该请求将不再起作用。在将旧标头设置为克隆标头之前,请使用request.headers.append(...)保存并修改旧标头。
OR
在拦截器中为您的文件请求定义一个异常。一种简单的方法是检查request.url中使用了哪个URL
if (request.url.indexOf('config') > -1) {
requestModified = request.clone({
url: request.url,
headers: request.headers.set('Content-Type', 'application/json')
});
}