I am searching for a long time on net. But no use. Please help or try to give some ideas how to achieve this. I have a file download function. In JMeter, i can use Size Assertion to assert the size of ResponseBody. Does anyone know how to implement it in Gatling? Thanks in advance
Not sure what you're trying to very exactly.
Just body binary length? => use a header
check and verify the Content-Length header.
Body integrity => use a md5
or sha1
check