在URLConnection中设置标题的正确方法是什么？

问题描述：

我的代码如下所示：

My code is like the following:

URLConnection cnx = address.openConnection();
cnx.setAllowUserInteraction(false);         
cnx.setDoOutput(true);
cnx.addRequestProperty("User-Agent", 
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)");
InputStream is = cnx.getInputStream();

如果在获取 InputStream 之前设置标题， code>？我的头文件是否会被发送，或者服务器是否会看到默认的 URLConnection 的用户代理（如果有）？

Is it ok if I set the headers before I get the InputStream? Will my header be sent, or will the server see the default URLConnection's user-agent ( if any ) ?

答

如果连接已经打开，c $ c> IllegalStateException 将被抛出。

The headers must be set prior to getting the InputStream to have any affect - an IllegalStateException will be thrown if the connection is already open.

至于 User-Agent $ c>头文件具体地说，它应该发送，如果它已被设置。

As far as the User-Agent header specifically, it should be sent if it has been set.

请参阅 URLConnection JavaDoc。

See the URLConnection JavaDoc.

在URLConnection中设置标题的正确方法是什么？

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