在URLConnection中设置标题的正确方法是什么? [英] What is the proper way of setting headers in a URLConnection?
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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 ) ?
推荐答案
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 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.
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