Angular Module Integration

/**
 * Angular module for HTTP services
 * Provides all necessary dependencies for XMLHttpRequest-based HTTP operations
 * Configures dependency injection for Http service and related components
 */
class HttpModule {
  // Provides the following services:
  // - Http (factory: httpFactory)
  // - BrowserXhr
  // - RequestOptions (useClass: BaseRequestOptions)
  // - ResponseOptions (useClass: BaseResponseOptions)
  // - XHRBackend
  // - XSRFStrategy (factory: _createDefaultCookieXSRFStrategy)
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpModule } from '@angular/http';
import { AppComponent } from './app.component';

@NgModule({
  imports: [
    BrowserModule,
    HttpModule  // Import HttpModule to enable HTTP services
  ],
  declarations: [AppComponent],
  bootstrap: [AppComponent]
})
export class AppModule {}

import { Component } from '@angular/core';
import { Http } from '@angular/http';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

@Component({
  selector: 'app-users',
  template: `
    <div *ngFor="let user of users | async">
      {{ user.name }} - {{ user.email }}
    </div>
  `
})
export class UsersComponent {
  users: Observable<any[]>;
  
  constructor(private http: Http) {
    // Http service is automatically injected by HttpModule
    this.users = this.http.get('/api/users')
      .pipe(map(response => response.json()));
  }
}

/**
 * Angular module for JSONP services
 * Provides all necessary dependencies for JSONP-based HTTP operations
 * Configures dependency injection for Jsonp service and related components
 */
class JsonpModule {
  // Provides the following services:
  // - Jsonp (factory: jsonpFactory)
  // - BrowserJsonp
  // - RequestOptions (useClass: BaseRequestOptions)
  // - ResponseOptions (useClass: BaseResponseOptions)
  // - JSONPBackend
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { JsonpModule } from '@angular/http';
import { AppComponent } from './app.component';

@NgModule({
  imports: [
    BrowserModule,
    JsonpModule  // Import JsonpModule to enable JSONP services
  ],
  declarations: [AppComponent],
  bootstrap: [AppComponent]
})
export class AppModule {}

import { Component } from '@angular/core';
import { Jsonp } from '@angular/http';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

@Component({
  selector: 'app-external-data',
  template: `
    <div *ngFor="let item of externalData | async">
      {{ item.title }}
    </div>
  `
})
export class ExternalDataComponent {
  externalData: Observable<any[]>;
  
  constructor(private jsonp: Jsonp) {
    // Jsonp service is automatically injected by JsonpModule
    const url = 'https://api.external.com/data?callback=JSONP_CALLBACK';
    this.externalData = this.jsonp.get(url)
      .pipe(map(response => response.json()));
  }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpModule, JsonpModule } from '@angular/http';
import { AppComponent } from './app.component';

@NgModule({
  imports: [
    BrowserModule,
    HttpModule,    // For regular HTTP requests
    JsonpModule    // For JSONP requests
  ],
  declarations: [AppComponent],
  bootstrap: [AppComponent]
})
export class AppModule {}

import { Injectable } from '@angular/core';
import { Http, Jsonp } from '@angular/http';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

@Injectable()
export class DataService {
  
  constructor(
    private http: Http,    // From HttpModule
    private jsonp: Jsonp   // From JsonpModule
  ) {}
  
  // Use Http for same-origin requests
  getLocalData(): Observable<any[]> {
    return this.http.get('/api/local-data')
      .pipe(map(response => response.json()));
  }
  
  // Use Jsonp for cross-origin requests
  getExternalData(): Observable<any[]> {
    const url = 'https://api.external.com/data?callback=JSONP_CALLBACK';
    return this.jsonp.get(url)
      .pipe(map(response => response.json()));
  }
}

/**
 * Factory function for creating Http service
 * @param xhrBackend - XMLHttpRequest backend implementation
 * @param requestOptions - Default request options
 * @returns Configured Http service instance
 */
function httpFactory(xhrBackend: XHRBackend, requestOptions: RequestOptions): Http;

/**
 * Factory function for creating Jsonp service
 * @param jsonpBackend - JSONP backend implementation
 * @param requestOptions - Default request options
 * @returns Configured Jsonp service instance
 */
function jsonpFactory(jsonpBackend: JSONPBackend, requestOptions: RequestOptions): Jsonp;

/**
 * Factory function for creating default XSRF strategy
 * @returns Default cookie-based XSRF strategy
 */
function _createDefaultCookieXSRFStrategy(): CookieXSRFStrategy;

import { NgModule, ModuleWithProviders } from '@angular/core';
import { 
  Http, 
  XHRBackend, 
  RequestOptions, 
  BaseRequestOptions,
  ResponseOptions,
  BaseResponseOptions,
  BrowserXhr,
  XSRFStrategy,
  CookieXSRFStrategy
} from '@angular/http';

// Custom HTTP module with configuration
@NgModule({})
export class CustomHttpModule {
  
  static forRoot(config?: HttpConfig): ModuleWithProviders {
    return {
      ngModule: CustomHttpModule,
      providers: [
        BrowserXhr,
        { provide: RequestOptions, useClass: BaseRequestOptions },
        { provide: ResponseOptions, useClass: BaseResponseOptions },
        XHRBackend,
        { 
          provide: XSRFStrategy, 
          useFactory: () => new CookieXSRFStrategy(
            config?.xsrfCookieName || 'XSRF-TOKEN',
            config?.xsrfHeaderName || 'X-XSRF-TOKEN'
          )
        },
        {
          provide: Http,
          useFactory: (backend: XHRBackend, options: RequestOptions) => {
            return new Http(backend, options);
          },
          deps: [XHRBackend, RequestOptions]
        }
      ]
    };
  }
}

interface HttpConfig {
  xsrfCookieName?: string;
  xsrfHeaderName?: string;
}

// Usage
@NgModule({
  imports: [
    CustomHttpModule.forRoot({
      xsrfCookieName: 'MY_XSRF_TOKEN',
      xsrfHeaderName: 'X-MY-XSRF-TOKEN'
    })
  ]
})
export class AppModule {}

import { NgModule } from '@angular/core';
import { 
  Http,
  RequestOptions,
  BaseRequestOptions,
  Headers
} from '@angular/http';

// Custom request options
export class CustomRequestOptions extends BaseRequestOptions {
  constructor() {
    super();
    // Set default headers for all requests
    this.headers = new Headers({
      'Accept': 'application/json',
      'Content-Type': 'application/json',
      'X-API-Version': '2.0'
    });
    this.withCredentials = true;
  }
}

@NgModule({
  imports: [HttpModule],
  providers: [
    // Override default request options
    { provide: RequestOptions, useClass: CustomRequestOptions }
  ]
})
export class CustomHttpConfigModule {}

import { Injectable } from '@angular/core';
import { Http, RequestOptionsArgs, Response } from '@angular/http';
import { Observable } from 'rxjs';
import { map, catchError } from 'rxjs/operators';

// Service that wraps Http with additional functionality
@Injectable()
export class InterceptedHttp {
  
  constructor(private http: Http) {}
  
  get(url: string, options?: RequestOptionsArgs): Observable<Response> {
    return this.http.get(url, this.addAuthHeaders(options))
      .pipe(
        map(this.handleResponse),
        catchError(this.handleError)
      );
  }
  
  post(url: string, body: any, options?: RequestOptionsArgs): Observable<Response> {
    return this.http.post(url, body, this.addAuthHeaders(options))
      .pipe(
        map(this.handleResponse),
        catchError(this.handleError)
      );
  }
  
  private addAuthHeaders(options?: RequestOptionsArgs): RequestOptionsArgs {
    const token = localStorage.getItem('authToken');
    const headers = new Headers(options?.headers || {});
    
    if (token) {
      headers.set('Authorization', `Bearer ${token}`);
    }
    
    return { ...options, headers };
  }
  
  private handleResponse = (response: Response): Response => {
    // Log successful responses
    console.log(`HTTP ${response.status}: ${response.url}`);
    return response;
  }
  
  private handleError = (error: any): Observable<never> => {
    // Log errors
    console.error('HTTP Error:', error);
    return throwError(error);
  }
}

// Module providing the intercepted HTTP service
@NgModule({
  imports: [HttpModule],
  providers: [
    InterceptedHttp,
    // Optionally override Http with InterceptedHttp
    // { provide: Http, useExisting: InterceptedHttp }
  ]
})
export class InterceptedHttpModule {}

import { NgModule } from '@angular/core';
import { HttpModule } from '@angular/http';
import { environment } from '../environments/environment';

// Development-specific HTTP configuration
@NgModule({
  imports: [HttpModule],
  providers: environment.production ? [] : [
    // Development-only providers
    {
      provide: 'API_BASE_URL',
      useValue: 'http://localhost:3000/api'
    }
  ]
})
export class EnvironmentHttpModule {}

// Service using environment configuration
@Injectable()
export class ApiService {
  
  constructor(
    private http: Http,
    @Inject('API_BASE_URL') private baseUrl: string
  ) {}
  
  getData(): Observable<any> {
    const url = `${this.baseUrl}/data`;
    return this.http.get(url)
      .pipe(map(response => response.json()));
  }
}

import { NgModule } from '@angular/core';
import { MockBackend, MockConnection } from '@angular/http/testing';
import { Http, BaseRequestOptions, ResponseOptions, Response } from '@angular/http';

// Testing module with mock backend
@NgModule({
  providers: [
    MockBackend,
    BaseRequestOptions,
    {
      provide: Http,
      useFactory: (mockBackend: MockBackend, options: BaseRequestOptions) => {
        return new Http(mockBackend, options);
      },
      deps: [MockBackend, BaseRequestOptions]
    }
  ]
})
export class HttpTestingModule {}

// Usage in tests
describe('DataService', () => {
  let service: DataService;
  let mockBackend: MockBackend;
  
  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpTestingModule],
      providers: [DataService]
    });
    
    service = TestBed.get(DataService);
    mockBackend = TestBed.get(MockBackend);
  });
  
  it('should fetch data', () => {
    mockBackend.connections.subscribe((connection: MockConnection) => {
      connection.mockRespond(new Response(new ResponseOptions({
        body: JSON.stringify({ data: 'test' })
      })));
    });
    
    service.getData().subscribe(data => {
      expect(data.data).toBe('test');
    });
  });
});