/**

* @license

* Copyright Google LLC All Rights Reserved.

*

* Use of this source code is governed by an MIT-style license that can be

* found in the LICENSE file at https://angular.dev/license

*/

import {Observable} from 'rxjs';

import {HttpRequest} from './request';

import {HttpEvent} from './response';

/**

* Transforms an `HttpRequest` into a stream of `HttpEvent`s, one of which will likely be a

* `HttpResponse`.

*

* `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`.

*

* In an `HttpInterceptor`, the `HttpHandler` parameter is the next interceptor in the chain.

*

* @publicApi

*/

export abstract class HttpHandler {

abstract handle(req: HttpRequest<any>): Observable<HttpEvent<any>>;

}

/**

* A final `HttpHandler` which will dispatch the request via browser HTTP APIs to a backend.

*

* Interceptors sit between the `HttpClient` interface and the `HttpBackend`.

*

* When injected, `HttpBackend` dispatches requests directly to the backend, without going

* through the interceptor chain.

*

* @publicApi

*/

export abstract class HttpBackend implements HttpHandler {

abstract handle(req: HttpRequest<any>): Observable<HttpEvent<any>>;

}