服务器端集成（REST API） 本地测试正常 部署到服务器调用api时异常

请求时使用HttpURLConnection

java.io.IOException: Server returned HTTP response code: 400 for URL:
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1514)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1508)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1162)
    at java.net.URLConnection.getContent(URLConnection.java:688)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getContent(HttpsURLConnectionImpl.java:406)