Because IEs try to download files when gzip is enable in boost, I disable gzip and re-paste the generated rules to .htaccess file. I clear the cache, the IEs are fine. I enable gzip and test around, IEs are still fine. After a while, I found that "boost-gzip-cookie-test.html not found" in log. What is the purpose of boost-gzip-cookie-test? Do I need to put these gzip rules in .htaccess file for correct running? The default rules cause IEs to download files and display a warning message. Or what is the correct way not to let IEs display such download file warning but gzip is enable? Thanks.