HttpURLConnection 将我的 POST 请求重定向到 GET

问题描述

我正在发送一个带有 setInstanceFollowRedirects(true) 和 POST 的 HttpURLConnection，得到如下所示的重定向响应:

I'm sending a HttpURLConnection with setInstanceFollowRedirects(true) and POST, get a redirect response that looks like this:

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中的 HTTP 标头之一.

And the next request that the JVM sends is a GET request (to the correct, redirected URL). It also seems to drop one of the HTTP headers I added to the original request.

仅供参考，我没有直接使用 HttpURLConnection，而是通过 Play Framework 的 WS 包装器.

FYI, I'm not using HttpURLConnection directly, but rather through Play Framework's WS wrapper.

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 中的一个错误?

My question is - is this a known issue with Java (Sun JVM 1.7.0)? Or could it be a bug in Play Framework?

推荐答案

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.

This is the default behavior of Java. You can change it by setting the system property http.strictPostRedirect=true.

详情请看Java源码中的这个引用HttpURLConnection 实现源码:

For details, please see this quote from the Java source HttpURLConnection implementation source:

    /* 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"
     */

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