[英]Angular 5 Provide http interceptor based on environment
I have the following two environments in my angular-cli (v1.5.1, angular v5) application: 我的angular-cli(v1.5.1,angular v5)应用程序中具有以下两个环境:
Dev makes use of mock data, which I provide with an http-interceptor. 开发人员利用了模拟数据,该数据由http-interceptor提供。 Pro makes use of a live rest api.
专业版利用实时休息API。
How do I provide the http-interceptor on dev, but not on pro? 如何在dev上提供http-interceptor,在pro上不提供? I already tried the following, but it doesn't work:
我已经尝试了以下方法,但是不起作用:
{
provide: HTTP_INTERCEPTORS,
useFactory: () => {
if (environment.useMockBackend === true) {
return MockHttpInterceptor;
}
return false;
},
multi: true
}
In my Angular 5.2 project I used following approach. 在我的Angular 5.2项目中,我使用了以下方法。
app.module.ts app.module.ts
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { environment } from '../environments/environment';
import { MyInterceptor } from './my.interceptor';
const commonProviders = [/*...*/];
const nonProductionProviders = [{
provide: HTTP_INTERCEPTORS,
useClass: MyInterceptor,
multi: true
}];
@NgModule({
imports: [
HttpClientModule,
// ...
],
providers: [
...commonProviders,
...!environment.production ? nonProductionProviders : []
]
})
my.interceptor.ts 我的拦截器
import { Injectable } from '@angular/core';
import { HttpEvent, HttpRequest, HttpInterceptor, HttpHandler } from '@angular/common/http';
import { Observable } from 'rxjs';
@Injectable()
export class MyInterceptor implements HttpInterceptor {
intercept(
req: HttpRequest<any>,
next: HttpHandler
): Observable<HttpEvent<any>> {
// ...
return next.handle(req);
}
}
The idea is to export interceptor providers from environment file, prod environment exports do-nothing interceptor or just any other dummy provider (lets name it DefaultHttpInterceptor
) and dev exports MockHttpInterceptor
. 这个想法是从环境文件中导出拦截器提供程序,prod环境导出无作用的拦截器或仅导出任何其他虚拟提供程序(将其命名为
DefaultHttpInterceptor
),而dev导出MockHttpInterceptor
。
dev environment: export const INTERCEPTORS = {provide: HTTP_INTERCEPTORS, ... MockHttpInterceptor}
开发环境:
export const INTERCEPTORS = {provide: HTTP_INTERCEPTORS, ... MockHttpInterceptor}
prod environment: export const INTERCEPTORS = {provide: HTTP_INTERCEPTORS, ... DefaultHttpInterceptor}
生产环境:
export const INTERCEPTORS = {provide: HTTP_INTERCEPTORS, ... DefaultHttpInterceptor}
Then you can use it like usual: 然后您可以像平常一样使用它:
import { INTERCEPTORS } from './../environments/environment';
@NgModule({
providers : [
...
INTERCEPTORS
...
]
...
})
I've come up with the following approach (this is in Angular 7), by drawing on the previous answers from @dhilt and @kemsky: 我通过借鉴@dhilt和@kemsky的先前答案,提出了以下方法(在Angular 7中):
Your dev environment file 您的开发环境文件
import { HTTP_INTERCEPTORS } from '@angular/common/http';
import { MyDevInterceptor} from './my-dev.interceptor';
export const ENVIRONMENT_SPECIFIC_PROVIDERS = [
{ provide: HTTP_INTERCEPTORS, useClass: MyDevInterceptor, multi: true }
];
environment.prod.ts 环境产品
export const ENVIRONMENT_SPECIFIC_PROVIDERS = [];
app.module.ts app.module.ts
@NgModule({
declarations: [],
imports: [
HttpClientModule
],
providers: [
ENVIRONMENT_SPECIFIC_PROVIDERS
]
})
It's simple, it works a treat, and it means that your code base contains no references to anything that's not required by your environment. 这很简单,可以很好地对待您,并且意味着您的代码库不包含对您的环境不需要的任何内容的引用。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.