HTTP组件核心遵循重定向

Question

好吧,我正试图找到一种方法让http组件跟随重定向,但没有在谷歌上找到任何,所以我来这里寻求帮助该功能:

public String GetSite(String site, String path) throws Exception {

    HttpParams params = new SyncBasicHttpParams();
    HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
    HttpProtocolParams.setContentCharset(params, "UTF-8");
    HttpProtocolParams.setUserAgent(params, "HttpComponents/1.1");
    HttpProtocolParams.setUseExpectContinue(params, true);

    HttpProcessor httpproc = new ImmutableHttpProcessor(new HttpRequestInterceptor[]{
                // Required protocol interceptors
                new RequestContent(),
                new RequestTargetHost(),
                // Recommended protocol interceptors
                new RequestConnControl(),
                new RequestUserAgent(),
                new RequestExpectContinue()});

    HttpRequestExecutor httpexecutor = new HttpRequestExecutor();

    HttpContext context = new BasicHttpContext(null);
    HttpHost host = new HttpHost(site, 80);

    DefaultHttpClientConnection conn = new DefaultHttpClientConnection();
    ConnectionReuseStrategy connStrategy = new DefaultConnectionReuseStrategy();

    context.setAttribute(ExecutionContext.HTTP_CONNECTION, conn);
    context.setAttribute(ExecutionContext.HTTP_TARGET_HOST, host);

    try {

        String[] targets = {
            path};

        for (int i = 0; i < targets.length; i++) {
            if (!conn.isOpen()) {
                Socket socket = new Socket(host.getHostName(), host.getPort());
                conn.bind(socket, params);
            }
            BasicHttpRequest request = new BasicHttpRequest("GET", targets[i]);
            request.setParams(params);
            httpexecutor.preProcess(request, httpproc, context);
            HttpResponse response = httpexecutor.execute(request, conn, context);
            response.setParams(params);
            httpexecutor.postProcess(response, httpproc, context);

            if (!connStrategy.keepAlive(response, context)) {
                conn.close();
            } else {
            }
            return (EntityUtils.toString(response.getEntity()));

        }
    } finally {
        conn.close();
    }
    return null;

}

对此也有任何帮助吗？因为我找不到任何东西......

Answer 1

我建议您使用DefaultHttpClient支持重定向的基本版本，无需任何调整或附加代码。其行为可以通过第 5.2 节 HttpClient 参数中描述的 4 个参数来控制。

如果您确实不想依赖httpcomponents-client而只想依赖httpcomponents-core，则必须从中获取实现org.apache.http.impl.client.RedirectStrategy并创建自己的代码来解析响应，确定它是否是有效的重定向（仔细阅读 HTTP 规范，这并不那么简单）并且如果需要，会在循环中触发新的请求。

我的观点：没有理由再次编写如此复杂的代码，并且有一天需要身份验证，您也必须添加该支持。所以，就依赖HttpClient吧。