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[英]Intercepting HTTP Response headers with Angular 4.3's HttpInterceptor
[英]Angular 8 - HttpInterceptor - read response headers
我在 HttpInterceptor 的響應中缺少 http 標頭。 我可以得到一個正文,但不能得到標題。 請參閱附加的輸出和我的代碼。
@Injectable()
export class ApiVersionInterceptor implements HttpInterceptor {
intercept(
req: import("@angular/common/http").HttpRequest<any>,
next: import("@angular/common/http").HttpHandler
): import("rxjs").Observable<import("@angular/common/http").HttpEvent<any>> {
return next.handle(req).pipe(
tap(httpEvent=>{
// Skip request
if(httpEvent.type === 0){
return;
}
console.log("response: ", httpEvent);
})
);
}
}
哇哦我解決了我的問題。
這不是 Angular 問題,而是服務器問題。 我需要添加另一個標題:
"access-control-expose-headers": "mintargetapiversion"
如果未在“access-control-expose-header”中指定,Angular 會忽略自定義標頭
使用httpEvent.headers.get()
方法,如下所示:
@Injectable()
export class ApiVersionInterceptor implements HttpInterceptor {
intercept(
req: import("@angular/common/http").HttpRequest<any>,
next: import("@angular/common/http").HttpHandler
): import("rxjs").Observable<import("@angular/common/http").HttpEvent<any>> {
return next.handle(req).pipe(
tap((httpEvent: HttpEvent<any>) =>{
// Skip request
if(httpEvent.type === 0){
return;
}
console.log("response: ", httpEvent);
let minTargetApiVersion : string;
if (httpEvent instanceof HttpResponse) {
if(httpEvent.headers.has('mintargetapiversion')) {
minTargetApiVersion = httpEvent.headers.get('mintargetapiversion');
}
}
})
);
}
}
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