weather_station/Web/weather/src/app/station.service.ts

import { Injectable } from '@angular/core'
import { HttpClient, HttpErrorResponse, HttpHeaders, HttpParams, HttpRequest } from '@angular/common/http'
import { Observable, Subject, throwError } from 'rxjs'
import { catchError, retry } from 'rxjs/operators'
import { environment } from '../environments/environment'

@Injectable({
  providedIn: 'root'
})

export class StationService {

  private restApi = `${environment.API_URL}`

  constructor(
    private http: HttpClient
  ) {  }

  commonHeaders(): any {
    return  new HttpHeaders({
      //'Authorization': `Bearer ${sessionStorage.getItem('auth_token')}`
    })
  }

  protected handleError(error: HttpErrorResponse) {
    if(error.error instanceof ErrorEvent) {
      console.error('An error occurred:', error.error.message)
    }
    return throwError(error)
  }


  getData(day: string): Observable<any> {
    const apiUrl = `${this.restApi}/get_data?day=${day}`;
    return this.http.get<any>(apiUrl, {headers: this.commonHeaders()}).pipe(
      catchError(this.handleError)
    )
  }

}