做post請求時，服務端可以偵測到接收到兩個非空的字段，但是回傳了錯誤分類： JAVA HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException type Exception report message Request processing failed ; nested exception is java.lang.NullPointerException description The server encountered an internal error that prevented it from fulfilling this request. exception o
空指针了，说明你服务端写的有问题了。好好测测服务端，接受空字段报错了应该。