April 4, 2001

NOCACHE2.ASP


I. Description

   This script is designed to send an image to a 
   browser along with the the following HTTP HEADERS:
   
   Expires:0
   Pragma: no-cache
   
   
   These headers will prevent most browsers from 
   storing the image in the cache.
   
   Version 1 of the scripts would sometimes send a 
   broken image if the original file was updated
   while being downloaded by a browser. Version 2
   fixes this problem by creating a temporary copy
   of the file in a directory. The temporary copy
   is served to the browser and then deleted.
   

II. Installation

   To install this script, copy it to a directory
   that has Script Executable privledges. Modify
   the following variables to reflect your local
   server settings:
   
   
   1) imageFile = the filename of the image you are 
   		  sending (i.e. test_image1.jpg)

   2) imageDir= the directory where the original 
   		image is located

   3) tempDir= the directory where the temp copy of 
   	       the image will be stored
   
   The web server must be configured to allow this ASP 
   to read the imageDir directory and write the tempDir 
   directory. The imageDir and tempDir variables can 
   point to the same directory.