HttpURLConnection将我的POST请求重定向到GET

Question

我正在发送一个HttpURLConnectionwith,setInstanceFollowRedirects(true)并POST获得一个看起来像这样的重定向响应:

HTTP/1.1 302 Found
Server: nginx
Date: Wed, 09 Jan 2013 20:47:56 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Status: 302 Found
Status: 301 Moved Permanently
Location: http://foo.bar/...

JVM发送的下一个请求是GET请求(到正确的重定向URL).它似乎也删除了我添加到原始请求的HTTP标头之一.

仅供参考,我不是HttpURLConnection直接使用,而是通过Play Framework的WS包装器.

我的问题是 - 这是Java(Sun JVM 1.7.0)的已知问题吗？或者它可能是Play Framework中的错误？

Answer 1

这是Java的默认行为.您可以通过设置系统属性http.strictPostRedirect = true来更改它.

有关详细信息,请参阅Java源代码HttpURLConnection实现源中的引用:

    /* The HTTP/1.1 spec says that a redirect from a POST 
     * *should not* be immediately turned into a GET, and
     * that some HTTP/1.0 clients incorrectly did this.
     * Correct behavior redirects a POST to another POST.
     * Unfortunately, since most browsers have this incorrect
     * behavior, the web works this way now.  Typical usage
     * seems to be:
     *   POST a login code or passwd to a web page.
     *   after validation, the server redirects to another
     *     (welcome) page
     *   The second request is (erroneously) expected to be GET
     * 
     * We will do the incorrect thing (POST-->GET) by default.
     * We will provide the capability to do the "right" thing
     * (POST-->POST) by a system property, "http.strictPostRedirect=true"
     */