Is it possible to open a file when mod_proxy is activated ?

Hello,
On my Apache server, I have Proxy (ProxyOn) activated.
I would like to open files on the destination server with the command :

FILE *f = ap_pfopen(r->pool, r->filename, "r");

(and I have controlled, r->filename = proxy:URL )

But unfortunately it didn't work ! (f = NULL)
So how can I do that ?

Thks.

>> I would like to open files on the destination server

What is opening a file?

>> But unfortunately it didn't work

1) What did you do?
2) What did happen?
3) What you expected to happen?

>> I would like to open files on the destination server
>>What is opening a file?

I want to have a file descriptor (File *fd), so I can read the file with fgets, or use mD5 digest function on files.

>> But unfortunately it didn't work

1) What did you do?
2) What did happen?
3) What you expected to happen?

1) I did : FILE *f = ap_pfopen(r->pool, r->filename, "r");

2)but nothing happens

3) I would like to do then : use the file pointer f to read string, like fgets((f,..) ,etc. I have succeded in that with local files, but not with files on a remote computer.(and that's the case, beecause my server plays only the role of a proxy)

Do you understand better ?

(sorry for my english, I'm french...)

Jack