metron-interface/metron-config/src/app/http-interceptors/default-headers.interceptor.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { Injectable } from '@angular/core';
import { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest} from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable()
export class DefaultHeadersInterceptor implements HttpInterceptor {
   intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // Clone the request and replace the original headers with
    // cloned headers, updated with the authorization.
    const authReq = req.clone({
      setHeaders: {'Content-Type': 'application/json', 'X-Requested-With': 'XMLHttpRequest'}
    });
    return next.handle(authReq);
  }
 }