echu2013 opened a new issue #1988: x-content-type-options nosniff duplicated URL: https://github.com/apache/incubator-pagespeed-mod/issues/1988 In my scenario, where I choose the following Apache configuration setting: `Header set X-Content-Type-Options "nosniff"` Te following happens with, for example, Images or CSS rewritten by **mod_pagespeed**:  Disabling with `ModPageSpeed Off` reverts the behaviour. Looking at source code, found the following: https://github.com/apache/incubator-pagespeed-mod/blob/409bd76fd6eafc4cf1c414e679f3e912447a6a31/pagespeed/apache/apache_fetch.cc#L121 Which I suspect that it should be this way: ` // Replace, as in "add if not already present". The only valid value for this // header is "nosniff", so we don't have to worry about clobbering existing // usage. response_headers()->Replace("X-Content-Type-Options", "nosniff");` In short: Replace instead of Add (which duplicates the header if previously added),
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