angular学习之浅析HttpClientModule模块

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// app.module.ts
import { httpClientModule } from '@angular/common/http';
imports: [
  httpClientModule
]

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// app.component.ts
import { HttpClient } from '@angular/common/http';

export class AppComponent {
	constructor(private http: HttpClient) {}
}

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import { HttpClient } from "@angular/common/http"

export class AppComponent implements OnInit {
  constructor(private http: HttpClient) {}
  ngOnInit() {
    this.getUsers().subscribe(console.log)
  }
  getUsers() {
    return this.http.get("https://jsonplaceholder.typicode.com/users")
  }
}

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this.http.get(url [, options]);
this.http.post(url, data [, options]);
this.http.delete(url [, options]);
this.http.put(url, data [, options]);

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this.http.get<Post[]>('/getAllPosts')
  .subscribe(response => console.log(response))

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export declare class HttpParams {
    constructor(options?: HttpParamsOptions);
    has(param: string): boolean;
    get(param: string): string | null;
    getAll(param: string): string[] | null;
    keys(): string[];
    append(param: string, value: string): HttpParams;
    set(param: string, value: string): HttpParams;
    delete(param: string, value?: string): HttpParams;
    toString(): string;
}

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declare interface HttpParamsOptions {
    fromString?: string;
    fromObject?: {
        [param: string]: string | ReadonlyArray<string>;
    };
    encoder?: HttpParameterCodec;
}

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import { HttpParams } from '@angular/common/http';

let params = new HttpParams({ fromObject: {name: "zhangsan", age: "20"}})
params = params.append("sex", "male")
let params = new HttpParams({ fromString: "name=zhangsan&age=20"})

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export declare class HttpHeaders {
    constructor(headers?: string | {
        [name: string]: string | string[];
    });
    has(name: string): boolean;
    get(name: string): string | null;
    keys(): string[];
    getAll(name: string): string[] | null;
    append(name: string, value: string | string[]): HttpHeaders;
    set(name: string, value: string | string[]): HttpHeaders;
    delete(name: string, value?: string | string[]): HttpHeaders;
}

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let headers = new HttpHeaders({ test: "Hello" })

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declare type HttpObserve = 'body' | 'response';
// response 读取完整响应体
// body 读取服务器端返回的数据

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this.http.get(
  "https://jsonplaceholder.typicode.com/users", 
  { observe: "body" }
).subscribe(console.log)

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@Injectable()
export class AuthInterceptor implements HttpInterceptor {
  constructor() {}
	// 拦截方法
  intercept(
  	// unknown 指定请求体 (body) 的类型
    request: HttpRequest<unknown>,
    next: HttpHandler
     // unknown 指定响应内容 (body) 的类型
  ): Observable<HttpEvent<unknown>> {
    // 克隆并修改请求头
    const req = request.clone({
      setHeaders: {
        Authorization: "Bearer xxxxxxx"
      }
    })
    // 通过回调函数将修改后的请求头回传给应用
    return next.handle(req)
  }
}

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@Injectable()
export class AuthInterceptor implements HttpInterceptor {
  constructor() {}
	// 拦截方法
  intercept(
    request: HttpRequest<unknown>,
    next: HttpHandler
  ): Observable<any> {
    return next.handle(request).pipe(
      retry(2),
      catchError((error: HttpErrorResponse) => throwError(error))
    )
  }
}

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import { AuthInterceptor } from "./auth.interceptor"
import { HTTP_INTERCEPTORS } from "@angular/common/http"

@NgModule({
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: AuthInterceptor,
      multi: true
    }
  ]
})

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{
 	"/api/*": {
    "target": "http://localhost:3070",
    "secure": false,
    "changeOrigin": true
  }
}

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"scripts": {
  "start": "ng serve --proxy-config proxy.conf.json",
}

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"serve": {
  "options": {
    "proxyConfig": "proxy.conf.json"
  },