How to redirect pages with php extension

I'm moving a old php site in Grav.
I'd like to point old ulrs to new pages.
I tried to use route aliases in new page like this:

routes:
  aliases:
      - '/congressi.php?id_evento=296'

but I have "Page not found".
Is it possibile to do it in Grav without to use .htaccess redirect?
Thanks

Without seeing all your config, it's hard to give you specific advice. All I can say is to review carefully the documentation and make sure you have everything in order:

• "Routes" section of "Headers and Frontmatter" chapter
• "Routing" chapter

Another solution could be the full url to that page instead of the /... only, give that a go :)?

I'm pretty sure you'd have to do that outside Grav in your .htaccess or other server config file. A standard Grav server config will intercept *.php paths, so you'd need them to find your redirects before they reach Grav's settings. I'm 90% sure ;)

And congratulations on behalf of all web users for taking the trouble to redirect! :) Not even some of the giant wealthy sites like Google and Microsoft bother with this important step. I see dead links to their old URL schemes a lot, even from within their own sites.