防止 HttpClient 4 跟随重定向 [英] Preventing HttpClient 4 from following redirect

问题描述

我正在使用 Apache HttpComponents 库连接到我的 AppEngine 应用程序.为了对我的用户进行身份验证，我需要将身份验证令牌传递到应用程序的登录地址 (http://myapp.appspot.com/_ah/login?auth=...) 并从响应的标头中获取 cookie.但是，登录页面响应重定向状态码，我不知道如何阻止HttpClient跟随重定向，从而阻止我拦截cookie.

I'm connecting to my AppEngine application using the Apache HttpComponents library. In order to authenticate my users, I need to pass an authentication token along to the application's login address (http://myapp.appspot.com/_ah/login?auth=...) and grab a cookie from the header of the response. However, the login page responds with a redirect status code, and I don't know how to stop HttpClient from following the redirect, thus thwarting me from intercepting the cookie.

Fwiw，我用来发送请求的实际方法如下.

Fwiw, the actual method I use to send the request is below.

private void execute(HttpClient client, HttpRequestBase method) {
    // Set up an error handler
    BasicHttpResponse errorResponse = new BasicHttpResponse(
            new ProtocolVersion("HTTP_ERROR", 1, 1), 500, "ERROR");

    try {
        // Call HttpClient execute
        client.execute(method, this.responseHandler);
    } catch (Exception e) {
        errorResponse.setReasonPhrase(e.getMessage());
        try {
            this.responseHandler.handleResponse(errorResponse);
        } catch (Exception ex) {
            // log and/or handle
        }
    }
}

如何阻止客户端跟随重定向?

How would I stop the client from following the redirect?

谢谢.

更新:

根据下面的解决方案，我在创建一个 DefaultHttpClient 客户端 之后(并且在将它传递给 execute 方法之前)做了以下操作:

As per the solution below, I did the following after creating a DefaultHttpClient client (and before passing it to the execute method):

if (!this.followRedirect) {
    client.setRedirectHandler(new RedirectHandler() {
        public URI getLocationURI(HttpResponse response,
                HttpContext context) throws ProtocolException {
            return null;
        }

        public boolean isRedirectRequested(HttpResponse response,
                HttpContext context) {
            return false;
        }
    });
}

比看起来更冗长，但没有我想象的那么难.

More verbose than it seems it needs to be, but not as difficult as I thought.

推荐答案

尝试使用 RedirectHandler.这可能需要扩展 DefaultHttpClient 从 createRedirectHandler() 返回您的自定义实现.

Try using a RedirectHandler. That may require extending DefaultHttpClient to return your custom implementation from createRedirectHandler().

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