backend code:

,reponseheader,ResponseEntiry;
:

;
,

a.txt,:
:aaaa
:"YWFhYQ=="
springrequestMappingHandler:

:
ask for advice, how to solve it? do you want to change the configuration of handlermapping? I have tried to use ByteArrayHttpMessageConverter to swipe data to the browser. It still seems to be garbled
.
