问题描述：

现在我执行http请求的方式(从此答案中借用)是:

Right now the way I do http requests (borrowed from this answer) is this:

POST(url, data) {
        var headers = new Headers(), authtoken = localStorage.getItem('authtoken');
        headers.append("Content-Type", 'application/json');

        if (authtoken) {
        headers.append("Authorization", 'Token ' + authtoken)
        }
        headers.append("Accept", 'application/json');

        var requestoptions = new RequestOptions({
            method: RequestMethod.Post,
            url: this.apiURL + url,
            headers: headers,
            body: JSON.stringify(data)
        })

        return this.http.request(new Request(requestoptions))
        .map((res: Response) => {
            if (res) {
                return { status: res.status, json: res.json() }
            }
        });
    }

这正常工作，除了以下事实之外:如果返回的状态码不是200，则angular2将会失败.例如，如果用户要发布内容，并且服务器返回400，则angular 2将抛出异常:/p>

This works fine, except for the fact that angular2 will fail if the status code returned is anything else than 200. For example, if a user wants to post something and the server returns 400, angular 2 will throw the exception:

未捕获的异常:[对象对象]

uncaught exception: [object Object]

如何避免这种情况?我想在我的应用中处理这些状态代码，以增强用户体验(显示错误等)

How can I avoid this? I'd like to handle these status codes in my app in order to enhance user experience (show errors, etc)

答

是的，您可以使用catch操作符进行处理，并根据需要显示警报，但首先必须以这种方式导入Rxjs >

Yes you can handle with the catch operator like this and show alert as you want but firstly you have to import Rxjs for the same like this way

import {Observable} from 'rxjs/Rx';

return this.http.request(new Request(this.requestoptions))
            .map((res: Response) => {
                if (res) {
                    if (res.status === 201) {
                        return [{ status: res.status, json: res }]
                    }
                    else if (res.status === 200) {
                        return [{ status: res.status, json: res }]
                    }
                }
            }).catch((error: any) => {
                if (error.status === 500) {
                    return Observable.throw(new Error(error.status));
                }
                else if (error.status === 400) {
                    return Observable.throw(new Error(error.status));
                }
                else if (error.status === 409) {
                    return Observable.throw(new Error(error.status));
                }
                else if (error.status === 406) {
                    return Observable.throw(new Error(error.status));
                }
            });
    }

还可以处理.map函数时由catch块引发的错误(带有err块)，

also you can handel error (with err block) that is throw by catch block while .map function,

像这样-

...
.subscribe(res=>{....}
           err => {//handel here});

更新

根据任何状态的需要而无需检查特定状态，您可以尝试以下操作:-

Update

as required for any status without checking particluar one you can try this: -

return this.http.request(new Request(this.requestoptions))
            .map((res: Response) => {
                if (res) {
                    if (res.status === 201) {
                        return [{ status: res.status, json: res }]
                    }
                    else if (res.status === 200) {
                        return [{ status: res.status, json: res }]
                    }
                }
            }).catch((error: any) => {
                if (error.status < 400 ||  error.status ===500) {
                    return Observable.throw(new Error(error.status));
                }
            })
            .subscribe(res => {...},
                       err => {console.log(err)} );

如何在Angular 2中处理200以外的http状态代码

更新

Update

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