"/content/img.jpg" is sepcific to an application and which is deployed on "ser02".

Whenenver an web request is made accessing the application (deployed on ser02)...through upstream configuration...the service responds reaching ser02...but static files (/content/img.jpg) are not rendered. The access_log shows the file is trying to look on ser01 (Nginx is installed)

(You can configure nginx to know what that special thing is, so that things will work as you want.)
How pls.???