Setup error codes on IIS 6.0

Question

I want the IIS server to return HTTP 304 (Not Modified) when a particular file is accessed.

How can I set this up?

Answer 1

AFAIK, it isn't possible to do this (in IIS). There are a few criteria that have to be met for this code to be sent out:

1. Client must have cached copy of page.
2. The request's If-Modified-Since HTTP Header Time/date stamp must match what's on the server.

If both of those conditions are true, the server will return a HTTP 304 status code.

Answer 2

Check the "Enable Content Expiration" box on the HTTP Headers tab in IIS Manager:

IIS 6.0 F1: Web Site Properties - HTTP Headers Tab