信息 ：org.apache.tomcat.util.http.Parameters [DirectJDKLog.java : 173] Character decoding failed. Parameter [param] with value [] has been ignored. Note that the name and value quoted here may be corrupted due to the failed decoding. Use debug level logging to see the original, non-corrupted values.
Note: further occurrences of Parameter errors will be logged at DEBUG level.
原因 ：http接口请求，携带参数中含有%, 编码出错，导致数据传输为空。
解决 ：param.replaceAll("%" , "%25");
补充 ：
1.当发送参数数据类型为 "Content-Type", "application/x-www-form-urlencoded" 会出现此问题
2.当发送参数类型为 "Content-Type", "application/json" 接口使用@RequestBody接收入参 可以避免