错误：422(不可处理的实体). Angular4

2019年7月28日 411次阅读

我试图将localhost：4200上的Angular4数据发布到localhost：8000上的API.我和Postman合作得很好,但是和Angular不一样.然后我得到：

无法加载资源：服务器响应状态为422(不可处理的实体)

这是发布到api的服务：

@Injectable()
export class ApiService {
    constructor(private http: Http) { }
    login(username: string, password: string): Observable<Response>{
        const url = 'http://localhost:8000/login';
        const json = JSON.stringify({username: username, password: password});
        const headers: Headers = new Headers();
        headers.append('Content-Type', 'application/json; charset=UTF-8');
        return this.http.post(url, json, headers )
            .map(res => res.json());
    }
}

这是运行该方法的代码

   logIn(user: string, password: string){
      this.apiService.login(user, password).subscribe(
          data => console.log(data),
          error => console.log(error)
      );
    }

最佳答案

The 422 (Unprocessable Entity) status code means the server
understands the content type of the request entity (hence a
415(Unsupported Media Type) status code is inappropriate), and the
syntax of the request entity is correct (thus a 400 (Bad Request)
status code is inappropriate) but was unable to process the contained
instructions.

例如,如果XML请求主体包含格式正确(即语法正确)但语义错误的XML指令,则可能发生此错误情况.

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