java - 使用 POST 方法时的 HTTPClient 重定向

Question

我有一个网站，它使用以下 php 代码将我重定向到另一个网站:

<?php
    header("Location: new.php?id=".$_POST["id"]."&test=".rand(5,15));
    echo "35";
?>

-new.php

<?php
    echo "ID: ".$_GET["id"]."| TEST: ".$_GET["test"];
?>

如果我尝试使用 HTTPClient 发送 Post 请求，该站点不会将我重定向到其他站点(Post 请求的响应为 35)。当我发送 Get 请求时它工作得很好。请求的响应是 ID: |测试:13。

-http.java

public class Http {
    public static void main(String[] args) {
        HttpResponse response;
        CloseableHttpClient client = HttpClients.createDefault();

        HttpPost post = new HttpPost("http://localhost/test.php");
        try {
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
            nameValuePairs.add(new BasicNameValuePair("id","55"));
            post.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            response = client.execute(post);
            BufferedReader rd = new BufferedReader(new InputStreamReader(
                    response.getEntity().getContent()));
            String line = "";
            while ((line = rd.readLine()) != null) {
                System.out.println(line);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            HttpGet get = new HttpGet("http://localhost/test.php");
            response = client.execute(get);
            BufferedReader rd = new BufferedReader(new InputStreamReader(
                    response.getEntity().getContent()));
            String line = "";
            while ((line = rd.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }


    }
}

Answer 1

自动重定向 POST 请求违反 RFC 标准。因此，HttpClient 默认情况下不会执行此操作。然而根据DefaultRedirectStrategy的API这可以通过使用 LaxRedirectStrategy 来实现.

在代码中，这看起来像:

  DefaultHttpClient httpClient = new DefaultHttpClient();
  httpClient.setRedirectStrategy(new LaxRedirectStrategy());
  httpClient.execute(request);