HttpURLConnection POST失敗code=411

[chang74]

if(definition.debug)
{
System.getProperties().put("proxySet", "true");
System.getProperties().put("proxyHost", proxyIp);
System.getProperties().put("proxyPort", proxyPort);
}

HttpURLConnection conn = null;

conn = (HttpURLConnection) myUrl.openConnection();

conn.setDoInput(true);
conn.setDoOutput(true);
conn.setConnectTimeout(20000);
conn.setReadTimeout(20000);

conn.setRequestMethod("POST");

conn.setUseCaches(false);
conn.setInstanceFollowRedirects(true);
conn.setRequestProperty("Content-Length", String.valueOf(sendData.length));
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.connect();

int resCode = conn.getResponseCode();
if (resCode == HttpURLConnection.HTTP_OK)
{
//進不來，老是411 POST換成GET就可以成功返回200
}
怎麼辦？

[wang_zun_ren]

myUrl是啥？

[chang74]

[Quote=引用 1 楼 wang_zun_ren 的回复:]
myUrl是啥？

[/Quote]
myurl是一個接收POST請求的鏈接
字串是"http://xxx.xxx.com/post.aspx"
已知在IPHONE上的程序可以在此地址接收到POST數據，我覺得應該是我的請求設置有問題

[Sodino]

411 Length Required

The server refuses to accept the request without a defined Content- Length.