POST /submit HTTP/1.1
Host: localhost
User-Agent: curl/8.17.0
Accept: */*
Origin: https://example.com
Content-Length: 367
Content-Type: multipart/form-data; boundary=------------------------cmOi6twNhVJDu76bOwDTVz

--------------------------cmOi6twNhVJDu76bOwDTVz
Content-Disposition: form-data; name="username"
Content-Type: text/plain; charset=utf-7

+ADw-img+ACA-src+AD0-x+AD4-
--------------------------cmOi6twNhVJDu76bOwDTVz
Content-Disposition: form-data; name="dummy"
Content-Type: text/plain; charset=utf-8

dummy
--------------------------cmOi6twNhVJDu76bOwDTVz--