modified file w3-total-cache
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<?php
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namespace W3TC;
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if ( ! defined( 'W3TC' ) ) {
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die();
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}
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?>
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<div class="lightbox-content-padded">
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<h3><?php esc_html_e( 'Security Headers: Quick Reference', 'w3-total-cache' ); ?></h3>
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<fieldset>
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<legend><?php esc_html_e( 'Legend', 'w3-total-cache' ); ?></legend>
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<p>
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All of the directives that end with -src support similar values known as
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a source list. Multiple source list values can be space separated with the exception of
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'none' which should be the only value.
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</p>
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</fieldset>
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<table class="w3tcbc_qrf">
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<tr>
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<th>Source Value</th>
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<th>Example</th>
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<th>Description</th>
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</tr>
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<tr>
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<td><code>*</code></td>
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<td><code>img-src *</code></td>
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<td>Wildcard, allows any URL except data: blob: filesystem: schemes</td>
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</tr>
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<tr>
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<td><code>'none'</code></td>
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<td><code>object-src 'none'</code></td>
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<td>Prevents loading resources from any source</td>
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</tr>
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<tr>
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<td><code>'self'</code></td>
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<td><code>script-src 'self'</code></td>
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<td>Allows loading resources from the same origin (same scheme, host and port)</td>
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</tr>
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<tr>
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<td><code>data:</code></td>
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<td><code>img-src 'self' data:</code></td>
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<td>Allows loading resources via the data scheme (e.g. Base64 encoded images)</td>
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</tr>
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<tr>
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<td><code>domain.example.com</code></td>
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<td><code>img-src domain.example.com</code></td>
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<td>Allows loading resources from the specified domain name</td>
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</tr>
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<tr>
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<td><code>*.example.com</code></td>
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<td><code>img-src *.example.com</code></td>
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<td>Allows loading resources from any subdomain under example.com</td>
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</tr>
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<tr>
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<td><code>https://cdn.com</code></td>
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<td><code>img-src https://cdn.com</code></td>
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<td>Allows loading resources only over <acronym title="HyperText Transfer Protocol over SSL">HTTPS</acronym> matching the given domain</td>
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</tr>
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<tr>
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<td><code>https:</code></td>
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<td><code>img-src https:</code></td>
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<td>Allows loading resources only over <acronym title="HyperText Transfer Protocol over SSL">HTTPS</acronym> on any domain</td>
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</tr>
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<tr>
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<td><code>'unsafe-inline'</code></td>
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<td><code>script-src 'unsafe-inline'</code></td>
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<td>Allows use of inline source elements such as style attribute, onclick, or script tag bodies (depends on the context of the source it is applied to)</td>
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</tr>
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<tr>
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<td><code>'unsafe-eval'</code></td>
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<td><code>script-src 'unsafe-eval'</code></td>
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<td>Allows unsafe dynamic code evaluation such as Javascript eval()</td>
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</tr>
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</table>
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</div>
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