openresty proxy upload-file API

[hikerlin]

version：openresty/1.9.7.3
when i use openresty to proxy a webserver that created springbootwebflux. the upload-file API will be deny.
errorlog is
2023/05/18 17:22:46 [error] 30271#0: *8 readv() failed (104: Connection reset by peer) while reading upstream, client: 10.0.253.127, server: localhost, request: "POST /GJDR/business/common/manageObject$m=importCsv.service HTTP/1.1", upstream:........."
but when my webserver create by a springboot-tomcat, the API is fine.
and then
when i use a ordinary nginx to proxy my webserver webflux or tomcat, the API is fine.