Question

我有一个非常类似于的问题： Why is Angular not choosing correct overload for HttpClient.get(...)?

这：

Angular HttpClient return expecting observable<HttpEvent<any> rather than observable<any>

但这些解决方案均无效。

我的代码如下：

 getTopology(): Observable<Topology> {
    var me = this;
    let headers = new HttpHeaders({
        'Content-Type': 'application/json'
    });
    let params = new HttpParams();
    let options = {headers: headers, params: params};
    let url = this.url;
    return this.http.getTyped<Topology>(url, options);
}


 getTyped<T>(
     url: string,
     options: {
         headers: HttpHeaders;
         observe?: 'body';
         params?: HttpParams;
         reportProgress?: boolean;
         responseType?: 'json';
         withCredentials?: boolean;
     },
     signRequest = true
 ): Observable<T> {
     options.headers = options.headers.append(
         'Authorization',
         `Bearer ${localStorage.getItem('token')}`
     );
     return this.http.get<T>(url, options);
 }

它指向此获取：

 get(url: string, options?: {
    headers?: HttpHeaders | {
        [header: string]: string | string[];
    };
    observe?: 'body';
    params?: HttpParams | {
        [param: string]: string | string[];
    };
    reportProgress?: boolean;
    responseType?: 'json';
    withCredentials?: boolean;
}): Observable<Object>;

而不是这样：

get<T>(url: string, options?: {
    headers?: HttpHeaders | {
        [header: string]: string | string[];
    };
    observe?: 'body';
    params?: HttpParams | {
        [param: string]: string | string[];
    };
    reportProgress?: boolean;
    responseType?: 'json';
    withCredentials?: boolean;
}): Observable<T>;

有什么建议吗？我也在用Angular 6.0.6

Answer 1

当您要包装HttpClient方法时会发生这种情况，因为动态地传递选项无法检测选项的类型。如果您更改线路

return this.http.get<T>(url, options);

对此

return this.http.get<T>(url, {
     headers: yourHeaders;
     params: params;
 });

它将起作用。当打算包装HttpClient方法时，我遇到了同样的问题，但由于这个原因而放弃了。

Angular HttpClient选择了错误的get重载

1 个答案: