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HTTPClient (Error handling (Types of errors (Server-side errors produce…

- - - - Returns an observable of type HttpResponse
      - observe: 'response'
    - - responseType: 'text'
  - - - Use set() method
- - - - Implements the intercept() method of the HttpInterceptor interface
      - Altered or unaltered request should be passed to the next interceptor (or the backend handler) in the chain
      - An interceptor could return an artificial response without calling the next interceptor
      - Response observable can be extended by piping operators
    - - Should be provided in the same or a parent injector of the injector that provides HttpClient
      - Requests flow through the interceptor in the provided order and in the reverse order for responses
    - - setHeaders shortcut of the clone() method could be used for setting HTTP headers
      - clone() method should be used to modify request body and HTTP headers
      - HttpRequest and HttpResponse instance properties are readonly
    - - Setting HTTP headers
      - Logging requests and responses
      - Caching responses for requests
  - - - Setting reportProgress: true in an HttpRequest instance
      - Setting observe: 'events' in HttpClient request methods