Modifying and Forwarding HTTP Requests for Different Environments in Angular

Modifying and Forwarding HTTP Requests for Different Environments in Angular:

Interceptor:

This example demonstrates how to modify HTTP requests globally based on the environment. The key concepts covered here are Request Interception, Cloning the Request, and Forwarding the Request.


Request Interception: 

Modify the request before it is sent to the server.

Cloning the Request: 

Since HTTP requests are immutable, the clone() method is used to create a modified copy of the original request.

Forwarding the Request:

The modified request is forwarded to the next handler in the chain using next.handle(updateRequest).


Example:

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

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

import { Observable } from 'rxjs';

import { environment } from '../../environments/environment';


@Injectable({

  providedIn: 'root'

})

export class HttpInterceptorService implements HttpInterceptor {

  constructor() { }


  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {

    let updateRequest = req;

    if (environment.production) {

      updateRequest = req.clone({

        url: req.url.replace('http://localhost', 'https://api.production.com')

      });

    } else if (environment.testing) {

      updateRequest = req.clone({

        url: req.url.replace('http://localhost', 'https://api.testing.com')

      });

    }

    return next.handle(updateRequest);

  }

}

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