RE: How to check if a file exists before sending

From: "Tom Wood" <[email protected]>
To: <[email protected]>
Subject: How to check if a file exists before sending
Date: Tue, 2 Jul 2002 13:39:56 -0400
Reply-To: [email protected]

> I need to check if a file exists when it is requested
> and if it doesn't exists send another file.
> What is the best way to do this?
> Thanks in advance.

Write a dynamic module, and model it after demo2.c.  Your module should try
and fetch the file in the query string; if it doesn't exist, then send
another file.

Here's a simple diff to show what I'm talking about...

--- demo2.c     Tue Dec  4 04:18:47 2001
+++ redirect.c  Wed Jul  3 13:49:35 2002
@@ -46,8 +46,8 @@
                        req->event = 1;
                        ret = tux(TUX_ACTION_GET_OBJECT, req);
                        if (ret < 0 || req->error) {
-                               write (req->sock, ERROR, ERROR_LEN);
-                               goto abort;
+                               strcpy(req->objectname, "/backup.html");
+                               ret = tux(TUX_ACTION_GET_OBJECT, req);
                        }
                        break;

A sample request would be http://server/redirect.tux?/test.html.  If
test.html exists, send it; otherwise send another file (in this case,
backup.html).

David