使用Angular Universal时,在组件的ngOnInit中发出http请求是否有问题?
我一直在通过ng serve for development运行我的Angular应用程序,没有遇到任何错误。然而,当使用SSR时,每当我加载作为ngOnInit方法一部分发出http请求的组件时,我的服务器日志中就会出现错误。我的策略有什么问题吗 通过谷歌搜索我的错误,我没有找到任何有用的信息。我应该在页面完全加载之前等待以发出请求,还是使用其他方法?如果是的话,我会怎么做 我正在使用http代理中间件包向django服务器发送请求 这是当请求作为ngOnInit的一部分发出时出现的错误:使用Angular Universal时,在组件的ngOnInit中发出http请求是否有问题?,angular,angular-universal,http-proxy-middleware,Angular,Angular Universal,Http Proxy Middleware,我一直在通过ng serve for development运行我的Angular应用程序,没有遇到任何错误。然而,当使用SSR时,每当我加载作为ngOnInit方法一部分发出http请求的组件时,我的服务器日志中就会出现错误。我的策略有什么问题吗 通过谷歌搜索我的错误,我没有找到任何有用的信息。我应该在页面完全加载之前等待以发出请求,还是使用其他方法?如果是的话,我会怎么做 我正在使用http代理中间件包向django服务器发送请求 这是当请求作为ngOnInit的一部分发出时出现的错误: E
ERROR Error
at XMLHttpRequest.send (C:\{...}\dist\{...}\server\main.js:201490:19)
at Observable.rxjs__WEBPACK_IMPORTED_MODULE_1__.Observable [as _subscribe] (C:\{...}\dist\{...}\server\main.js:23724:17)
at Observable._trySubscribe (C:\{...}\dist\{...}\server\main.js:186583:25)
at Observable.subscribe (C:\{...}\dist\{...}\server\main.js:186569:22)
at scheduleTask (C:\{...}\dist\{...}\server\main.js:106745:32)
at Observable.rxjs__WEBPACK_IMPORTED_MODULE_7__.Observable [as _subscribe] (C:\{...}\dist\{...}\server\main.js:106807:13)
at Observable._trySubscribe (C:\{...}\dist\{...}\server\main.js:186583:25)
at Observable.subscribe (C:\{...}\dist\{...}\server\main.js:186569:22)
at subscribeToResult (C:\{...}\dist\{...}\server\main.js:196664:23)
at MergeMapSubscriber._innerSub (C:\{...}\dist\{...}\server\main.js:191854:116)
以下是我的测试组件的相关部分:
export class TestComponent implements OnInit {
output: String = "The server is not running or is not connected"
constructor(private httpTestService: HttpTestService) { }
ngOnInit(): void {
this.testGetRequest();
}
testGetRequest() {
this.httpTestService.testGetRequest().subscribe(temp => {
this.output = temp.message; // response is json with a 'message' attribute
});
}
}
以下是我的HttpTestService的相关部分:
import { HttpClient } from '@angular/common/http';
即使在使用SSR运行时,应用程序也能正常运行,但我在服务器控制台中遇到的错误除外。在进行HTTP调用时,您应该使用绝对URL 所以问题可能就在这里
testGetRequest(): Observable<any> {
return this.http.get('/api/endpoint1');
}
希望能有所帮助这对我来说很有效,但您答案中的文档链接已断开。我发现了类似的信息。哦,我的错。它应该只是一个官方文件的链接,我已经更新了。如果我的答案对你有效,请将其标记为正确答案。
import { createProxyMiddleware } from 'http-proxy-middleware';
export function app() {
const server = express();
const distFolder = join(process.cwd(), 'dist/.../browser');
const indexHtml = existsSync(join(distFolder, 'index.original.html')) ? 'index.original.html' : 'index';
server.engine('html', ngExpressEngine({
bootstrap: AppServerModule,
}));
server.set('view engine', 'html');
server.set('views', distFolder);
// re-route requests to /api/ to the django REST api
server.use('/api/**', createProxyMiddleware({ target: 'http://localhost:8000', changeOrigin: true }));
testGetRequest(): Observable<any> {
return this.http.get('/api/endpoint1');
}
import { HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http';
import { Inject, Injectable, Optional } from '@angular/core';
import { REQUEST } from '@nguniversal/express-engine/tokens';
import { Request } from 'express';
@Injectable()
export class UniversalInterceptor implements HttpInterceptor {
constructor(@Optional() @Inject(REQUEST) protected request: Request) {}
intercept(req: HttpRequest<any>, next: HttpHandler) {
let serverReq: HttpRequest<any> = req;
if (this.request && req.url.indexOf('http') !== 0) {
let newUrl = `${this.request.protocol}://${this.request.get('host')}`;
if (!req.url.startsWith('/')) {
newUrl += '/';
}
newUrl += req.url;
serverReq = req.clone({url: newUrl});
}
return next.handle(serverReq);
}
}
@NgModule({
imports: [
...
],
bootstrap: [AppComponent],
providers: [
{
provide: HTTP_INTERCEPTORS,
useClass: UniversalInterceptor,
multi: true,
},
],
})
export class AppServerModule {}