调用https://open.weixin.qq.com/connect/oauth2/authorize api时偶尔报javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake错误，这几天报错频繁些。jdk版本是1.7，设置的信任证书和设置了TLSv1.2版本。平均几天会出现2到3次，请问是什么原因？