我的GWT服务器端代码上的http代理 [英] http proxy on my GWT server-side code

问题描述

我有一个REST服务器作为后端，它提供了一组服务，并且它使用基本身份验证方法进行访问.

I have an REST server as backend, it provides a set of services, also, it uses basic authentication method for access.

现在我需要创建一个GWT前端，因此，我需要从GWT前端对REST后端执行http调用

Now I need to create an GWT frontend,so, I need to perform http calls to the REST backend from the GWT frontend

经过研究，我发现HttpBuilder可以处理对后端的http请求，但是在尝试执行跨站点请求时似乎很痛苦，并且还附带了一些与Safari浏览器有关的限制.

After some research I found the HttpBuilder to handle http requests to the backend, but it seem to be a pain when trying to perform cross-site requests, and also it comes with some restricions related with Safari browser.

然后我发现了这个 https://developers.google.com/web-toolkit/doc/latest/tutorial/Xsite 文章，其中讨论了您自己的服务器上的代理"，因此它似乎是我一直在寻找的解决方案，但我没有找到更多信息，或一个例子.它说我可以创建服务器端代码以从远程服务器(后端)下载数据，因此，我应该在 http客户端上创建一个 http客户端 >服务器端代码，并实现使用该服务向后端发出请求的服务集?(如果是)如何处理用户身份验证和会话?如果没有，请给我个灯.

Then I found this https://developers.google.com/web-toolkit/doc/latest/tutorial/Xsite article, where it talks about an "Proxy on your own server", so it looks to be the solution I was looking for, but I did not find more information, or an example. It says that I could create server-side code to download the data from remote server (backend), so, should I create a http client like the apache client on server-side code, and implement a set of services that use it to make request to the backend?, if yes, how to handle the user authentication and the session? if not, give me a light please.

谢谢

推荐答案

   it seem to be a pain when trying to perform cross-site requests,  

实际上，如果我们可以在Servlet Response Header中进行设置，则可以从GWT RequestBuilder发出跨站点请求

Actually you can make Cross Site Requests from GWT RequestBuilder if we can set in Servlet Response Header

Response.setHeader("Access-Control-Allow-Origin"，" http://yourrestserviceur.com/url);

Response.setHeader("Access-Control-Allow-Origin","http://yourrestserviceur.com/url");

should I create a http client like the apache client on server-side code, and implement 
a set of services that use it to make request to the backend?

否，不是必需的.使用RequestBuilder

No, it is not required. use RequestBuilder

RequestBuilder示例:

     RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);

        try {
          Request request = builder.sendRequest(null, new RequestCallback() {
            public void onError(Request request, Throwable exception) {
              displayError("Couldn't retrieve JSON");
            }

            public void onResponseReceived(Request request, Response response) {
              if (200 == response.getStatusCode()) {
                updateTable(asArrayOfStockData(response.getText()));
              } else {
                displayError("Couldn't retrieve JSON (" + response.getStatusText()
                    + ")");
              }
            }
          });
        } catch (RequestException e) {
          displayError("Couldn't retrieve JSON");
    }

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