can nginx calculate the content-length header for fastcgi proxied requests

[Andrew Benton]

i'm not sure whether this question even makes sense. i don't know
whether nginx is buffering responses that it receives from proxying
requests to a fastcgi process or its streaming that back to the
client.

but i would like to be able to have nginx calculate the content-length
header for requests that are fastcgi_pass-ed. couldn't find anything
online or in the documentation relating to this.

thanks!
amb