{"id":29335,"date":"2018-10-24T00:00:00","date_gmt":"2018-10-23T22:00:00","guid":{"rendered":"https:\/\/blexin.com\/?p=29335"},"modified":"2021-01-13T09:40:51","modified_gmt":"2021-01-13T08:40:51","slug":"il-nuovo-httpclient-in-angular","status":"publish","type":"post","link":"https:\/\/blexin.com\/it\/blog\/il-nuovo-httpclient-in-angular\/","title":{"rendered":"Il nuovo HttpClient in Angular"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

A partire dalla versione 5 di Angular, il modulo @angular\/http \u00e8 stato deprecato in favore del nuovo modulo @angular\/common\/http. Quindi abbiamo un nuovo oggetto per chiamare il nostro backend, che sostanzialmente introduce un tipo generico sul risultato che ci permette di omettere il classico .map(res:Response => res.json())<\/em>.<\/p>\n\n\n\n

L’importazione del modulo cambia come segue:<\/p>\n\n\n

\nimport { BrowserModule } from '@angular\/platform-browser'; \nimport { NgModule } from '@angular\/core'; \nimport { HttpClientModule } from '@angular\/common\/http'; \nimport { AppComponent } from '.\/app.component'; \n\u00a0\n@NgModule({ \n\u00a0\u00a0\u00a0\u00a0declarations: [ AppComponent ], \n\u00a0\u00a0\u00a0\u00a0imports: [ BrowserModule, HttpClientModule ], \n\u00a0\u00a0\u00a0\u00a0providers: [], \n\u00a0\u00a0\u00a0\u00a0bootstrap: [AppComponent] \n}) \nexport class AppModule { }\n<\/pre><\/div>\n\n\n
Un servizio di integrazione del backend pu\u00f2 quindi\u00a0essere scritto in questo modo:<\/p>\n\n\n
\nimport { Injectable } from '@angular\/core'; \nimport { HttpClient } from '@angular\/common\/http'; \nimport { Event } from '..\/events\/events.model'; \n\u00a0\n@Injectable() \nexport class BackendService { \n\u00a0\n\u00a0\u00a0\u00a0\u00a0constructor(private httpClient: HttpClient) {}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0getData() { \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return this.httpClient.get< Event[] >('http:\/\/localhost:3000\/api\/');\n\u00a0\u00a0\u00a0\u00a0} \n}\n<\/pre><\/div>\n\n\n
La sintassi \u00e8 veramente concisa e molto espressiva, grande! Ma la feature pi\u00f9 interessante \u00e8 la possibilit\u00e0 di inserire il proprio codice nella pipeline della richiesta: adesso \u00e8 possibile fare qualcosa prima e dopo l’effettiva chiamata HTTP con uno o pi\u00f9 interceptors<\/em>. Quindi, \u00e8 possibile creare la propria pipeline di richiesta HTTP e le possibilit\u00e0 sono infinite. Per fare alcuni esempi:<\/p>\n\n\n\n
  • Aggiungere qualcosa all’header della richiesta prima dell’invocazione HTTP, per esempio l’authentication token o qualsiasi cosa vogliate;<\/li>
  • Trasformare la response come si vuole dopo l’invocazione HTTP;<\/li>
  • Loggare le attivit\u00e0 HTTP;<\/li>
  • Centralizzare la gestione degli errori HTTP;<\/li>
  • Fare un redirect alla login se si riceve un errore 401, oppure ritentare l’operazione.<\/li><\/ul>\n\n\n\n
    Il limite \u00e8 la propria fantasia o, meglio, i propri requisiti.<\/p>\n\n\n\n
    Grazie a Typescript \u00e8 veramente semplice creare un Interceptor:<\/p>\n\n\n\n
    • Creare una classe che implementa l’interfaccia Interceptor;<\/li>
    • Implementare il metodo intercept<\/em> per fare quello che si vuole;<\/li>
    • Registrare la classe nella sezione providers<\/em> del modulo.<\/li><\/ul>\n\n\n\n
      Se usate\u00a0Visual Studio Code e avete installato gli snippet per Angular di John Papa, avete degli snippet per creare degli interceptor:<\/p>\n\n\n\n
      \"\"<\/figure>\n\n\n
      \nimport { Injectable } from '@angular\/core';\nimport { HttpInterceptor, HttpEvent, HttpHandler, HttpRequest } from '@angular\/common\/http';\nimport { Observable } from 'rxjs\/Observable';\n\u00a0\n@Injectable()\nexport class MyFirstInterceptor implements HttpInterceptor {\n\u00a0\n\u00a0\u00a0intercept(req: HttpRequest, next: HttpHandler): Observable> {\n\u00a0\u00a0\u00a0\u00a0return next.handle(req);\n\u00a0\u00a0}\n\u00a0\n}\n<\/pre><\/div>\n\n\n
      Potete aggiungere tutti gli\u00a0interceptor\u00a0di cui avete bisogno, saranno valutati nell’ordine in cui sono registrati:<\/p>\n\n\n
      \nimport { BrowserModule } from '@angular\/platform-browser'; \nimport { NgModule } from '@angular\/core'; \nimport { HttpClientModule, HTTP_INTERCEPTORS } from '@angular\/common\/http'; \nimport { AppComponent } from '.\/app.component';\n\u200bimport { MyFirstInterceptor } from '.\/shared\/myfirstinterceptor'; \n\u200bimport { MySecondInterceptor } from '.\/shared\/mysecondinterceptor';\n<\/pre><\/div>\n\n
      \n@NgModule({ \n\u00a0\u00a0\u00a0\u00a0declarations: [ AppComponent ], \n\u00a0\u00a0\u00a0\u00a0imports: [ BrowserModule, HttpClientModule ], \n\u00a0\u00a0\u00a0\u00a0providers: [\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0provide: HTTP_INTERCEPTORS,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0useClass: MyFirstInterceptor,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0multi: true,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0},\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0provide: HTTP_INTERCEPTORS,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0useClass: MySecondInterceptor,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0multi: true,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}], \n\u00a0\u00a0\u00a0\u00a0bootstrap: [AppComponent] \n}) \nexport class AppModule { }\n<\/pre><\/div>\n\n\n
      Nel nostro Raptor Framework, usiamo interceptor per molte attivit\u00e0.\u00a0Una di queste \u00e8 la gestione dell’errore di autenticazione: se ricevo un errore HTTP\u00a0401, l’utente viene redirezionato alla login:<\/p>\n\n\n
      \nimport { Injectable } from '@angular\/core'; \nimport { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest, HttpResponse, HttpErrorResponse } from '@angular\/common\/http'; \nimport { Observable } from 'rxjs\/Observable'; \nimport { Router, ActivatedRoute } from '@angular\/router'; \nimport 'rxjs\/add\/operator\/do'; \n\u00a0\n@Injectable()\nexport class RaptorInterceptor implements HttpInterceptor { \n\u00a0\u00a0\u00a0\u00a0constructor( private router: Router) { }\n\u00a0\n\u00a0\u00a0\u00a0\u00a0intercept(req: HttpRequest, next: HttpHandler): Observable> { \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return next.handle(req)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0.do((event: HttpEvent) => { \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if (event instanceof HttpResponse) {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/ TODO: logging \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}, (err: any) => { \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if (err instanceof HttpErrorResponse) { \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if (err.status === 401) { \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this.router.navigate(['login']); \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}); \n\u00a0\u00a0\u00a0\u00a0\u00a0} \n} \n<\/pre><\/div>\n\n\n
      Vi mostrer\u00f2 questo caso nella mia sessione sul Raptor Framework, il 29 Novembre a WPC 2017, non perdetevelo!<\/p>\n\n\n\n
      A presto<\/p>\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
      Chiamate HTTP pi\u00f9 semplici e Interceptor per centralizzare tutto<\/p>\n","protected":false},"author":196716248,"featured_media":29336,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_crdt_document":"","inline_featured_image":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false},"categories":[688637374],"tags":[688637387,688637442,688637445],"class_list":["post-29335","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-angular","tag-raptor","tag-vscode"],"yoast_head":"\nIl nuovo HttpClient in Angular - Blexin<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blexin.com\/it\/blog\/il-nuovo-httpclient-in-angular\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Il nuovo HttpClient in Angular - Blexin\" \/>\n<meta property=\"og:description\" content=\"Chiamate HTTP pi\u00f9 semplici e Interceptor per centralizzare tutto\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blexin.com\/it\/blog\/il-nuovo-httpclient-in-angular\/\" \/>\n<meta property=\"og:site_name\" content=\"Blexin\" \/>\n<meta property=\"article:published_time\" content=\"2018-10-23T22:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-01-13T08:40:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/i2.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/2ae1f179-6193-4355-a731-74d5495dae07.jpg?fit=750%2C422&ssl=1\" \/>\n\t<meta property=\"og:image:width\" content=\"750\" \/>\n\t<meta property=\"og:image:height\" content=\"422\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Michele Aponte\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Scritto da\" \/>\n\t<meta name=\"twitter:data1\" content=\"Michele Aponte\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blexin.com\/it\/blog\/il-nuovo-httpclient-in-angular\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blexin.com\/it\/blog\/il-nuovo-httpclient-in-angular\/\"},\"author\":{\"name\":\"Michele Aponte\",\"@id\":\"https:\/\/blexin.com\/it\/#\/schema\/person\/cdc5540c3b6edcacd8d760669e797005\"},\"headline\":\"Il nuovo HttpClient in Angular\",\"datePublished\":\"2018-10-23T22:00:00+00:00\",\"dateModified\":\"2021-01-13T08:40:51+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/blexin.com\/it\/blog\/il-nuovo-httpclient-in-angular\/\"},\"wordCount\":333,\"image\":{\"@id\":\"https:\/\/blexin.com\/it\/blog\/il-nuovo-httpclient-in-angular\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/2ae1f179-6193-4355-a731-74d5495dae07.jpg?fit=750%2C422&ssl=1\",\"keywords\":[\"Angular\",\"Raptor\",\"VScode\"],\"articleSection\":[\"Blog\"],\"inLanguage\":\"it-IT\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blexin.com\/it\/blog\/il-nuovo-httpclient-in-angular\/\",\"url\":\"https:\/\/blexin.com\/it\/blog\/il-nuovo-httpclient-in-angular\/\",\"name\":\"Il nuovo HttpClient in Angular - 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