HttpHandler
把一个 HttpRequest 转换成 HttpEvent 组成的流，HttpResponse 就是其中之一。
Transforms an HttpRequest into a stream of HttpEvents, one of which will likely be a HttpResponse.
abstract class HttpHandler {
abstract handle(req: HttpRequest<any>): Observable<HttpEvent<any>>
}
Provided in
说明
HttpHandler 是可注入的。当被注入时，该处理器的实例会把请求派发给拦截器链中的第一个拦截器，第一个拦截器会再派发给第二个拦截器，以此类推。 最终抵达 HttpBackend。
HttpHandler is injectable. When injected, the handler instance dispatches requests to the first interceptor in the chain, which dispatches to the second, etc, eventually reaching the HttpBackend.
在 HttpInterceptor 中，HttpHandler 参数就表示链中的下一个拦截器。
In an HttpInterceptor, the HttpHandler parameter is the next interceptor in the chain.
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