Remove Authorization Header for some http calls Angular

Question

I'm new to angular and trying to setup HTTP Authorization Headers. As of now I'm able to set authorization headers for all API's if token is valid. What I want is to set header for some API's only even if token is available.

app.module.ts

@NgModule({
  declarations: [AppComponent],
  imports: [
    HttpClientModule
  ],
  providers: [
    { provide: HTTP_INTERCEPTORS, useClass: JwtInterceptor, multi: true },
  ]
})

jwt.interceptor.ts

import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http';

    import { AuthenticationService } from '@/_services';
    import { Injectable } from '@angular/core';
    import { Observable } from 'rxjs';

    @Injectable()
    export class JwtInterceptor implements HttpInterceptor {
        constructor(private authenticationService: AuthenticationService) {}

        intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
            // add authorization header with jwt token if available
            const currentUser = this.authenticationService.currentUserValue;
            if (currentUser && currentUser.token) {
                request = request.clone({
                    setHeaders: {
                        Authorization: `Bearer ${currentUser.token}`
                    }
                });
            }

            return next.handle(request);
        }
    }

home-http.service.ts

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

@Injectable()
export class HomeHttpService {
    constructor(private http: HttpClient) { }

    getAll(url: string, paramsVal?: any): Observable<any[]> {
        const options = {params: paramsVal};
        return this.http.get<any[]>(url, options);
    }

    public getByID(url: string, id: number | string): Observable<any> {
        return this.http.get<any>(`${url}/${id}`);
    }

    public delete(url: string): Observable<any> {
        return this.http.delete<any>(url).pipe(
            map(response => {
                return response;
            })
        );
    }

    public post(data = [], url: string): Observable<any> {
        return this.http.post<any>(url, data);
    }

    public getExternal(url: string): Observable<any> {
        return this.http.get<any>(url);
    }

    public put(data: any, url: string): Observable<any> {
        return this.http.put<any>(url, data);
    }
}

home.service.ts

import { Injectable } from '@angular/core';

import { HomeHttpService } from '../home-http.service';
import { Observable } from 'rxjs';

@Injectable()
export class HomePageService {
  constructor(private apiservice: HomeHttpService) {}
  private basePath = `${url}`;

getAlldata(data): Observable<any> {
    return this.apiservice.getAll(this.basePath, data);
  }

How can I setup my code so that for some API's I can remove the authorization header for some APIs

Answer 1

In those service files use this way

import {HttpBackend, HttpClient} from "@angular/common/http";

constructor(private http: HttpClient, handler: HttpBackend ) {
    this.http = new HttpClient(handler);
}

Answer 2

You can use the request.url property to filter what you need. One of the easiest ways:

intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // add authorization header with jwt token if available
    const currentUser = this.authenticationService.currentUserValue;
    if (request.url.indexOf('some APIs path') === 0 && currentUser && currentUser.token) {
      request = request.clone({
        setHeaders: {
          Authorization: `Bearer ${currentUser.token}`
        }
      });
    }

    return next.handle(request);
  }

Answer 3

To be more precise, you can take a look at the example below

import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http';

import { AuthenticationService } from '@/_services';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';

@Injectable()
export class JwtInterceptor implements HttpInterceptor {
    constructor(private authenticationService: AuthenticationService) {}

    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        // add authorization header with jwt token if available
        const currentUser = this.authenticationService.currentUserValue;
        if (this.isHeaderNeeded() &&currentUser && currentUser.token) {
            request = request.clone({
                setHeaders: {
                    Authorization: `Bearer ${currentUser.token}`
                }
            });
        }

        return next.handle(request);
    }
}

isHeaderNeeded(url: string) {
    if (url === "other.api.com") { // this condition is up to you, it could be an exact match or how ever you like
        return false;
    } else {
        return true;
    }
}