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21
develop/print.html
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@ -5456,9 +5456,10 @@ to download/operate on media.</p>
<p>This will not prevent the listed domains from accessing media themselves.
It simply prevents users on this server from downloading media originating
from the listed servers.</p>
<p>This will have no effect on media originating from the local server.
This only affects media downloaded from other Matrix servers, to
block domains from URL previews see <a href="usage/configuration/config_documentation.html#url_preview_url_blacklist"><code>url_preview_url_blacklist</code></a>.</p>
<p>This will have no effect on media originating from the local server. This only
affects media downloaded from other Matrix servers, to control URL previews see
<a href="usage/configuration/config_documentation.html#url_preview_ip_range_blacklist"><code>url_preview_ip_range_blacklist</code></a> or
<a href="usage/configuration/config_documentation.html#url_preview_url_blacklist"><code>url_preview_url_blacklist</code></a>.</p>
<p>Defaults to an empty list (nothing blocked).</p>
<p>Example configuration:</p>
<pre><code class="language-yaml">prevent_media_downloads_from:
@ -5584,12 +5585,14 @@ website only visible in your network. Defaults to none.</p>
</code></pre>
<hr />
<h3 id="url_preview_url_blacklist"><a class="header" href="#url_preview_url_blacklist"><code>url_preview_url_blacklist</code></a></h3>
<p>Optional list of URL matches that the URL preview spider is
denied from accessing. You should use <code>url_preview_ip_range_blacklist</code>
in preference to this, otherwise someone could define a public DNS
entry that points to a private IP address and circumvent the blacklist.
This is more useful if you know there is an entire shape of URL that
you know that will never want synapse to try to spider.</p>
<p>Optional list of URL matches that the URL preview spider is denied from
accessing. This is a usability feature, not a security one. You should use
<code>url_preview_ip_range_blacklist</code> in preference to this, otherwise someone could
define a public DNS entry that points to a private IP address and circumvent
the blacklist. Applications that perform redirects or serve different content
when detecting that Synapse is accessing them can also bypass the blacklist.
This is more useful if you know there is an entire shape of URL that you know
that you do not want Synapse to preview.</p>
<p>Each list entry is a dictionary of url component attributes as returned
by urlparse.urlsplit as applied to the absolute form of the URL. See
<a href="https://docs.python.org/2/library/urlparse.html#urlparse.urlsplit">here</a> for more

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21
develop/usage/configuration/config_documentation.html
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@ -1844,9 +1844,10 @@ to download/operate on media.</p>
<p>This will not prevent the listed domains from accessing media themselves.
It simply prevents users on this server from downloading media originating
from the listed servers.</p>
<p>This will have no effect on media originating from the local server.
This only affects media downloaded from other Matrix servers, to
block domains from URL previews see <a href="#url_preview_url_blacklist"><code>url_preview_url_blacklist</code></a>.</p>
<p>This will have no effect on media originating from the local server. This only
affects media downloaded from other Matrix servers, to control URL previews see
<a href="#url_preview_ip_range_blacklist"><code>url_preview_ip_range_blacklist</code></a> or
<a href="#url_preview_url_blacklist"><code>url_preview_url_blacklist</code></a>.</p>
<p>Defaults to an empty list (nothing blocked).</p>
<p>Example configuration:</p>
<pre><code class="language-yaml">prevent_media_downloads_from:
@ -1972,12 +1973,14 @@ website only visible in your network. Defaults to none.</p>
</code></pre>
<hr />
<h3 id="url_preview_url_blacklist"><a class="header" href="#url_preview_url_blacklist"><code>url_preview_url_blacklist</code></a></h3>
<p>Optional list of URL matches that the URL preview spider is
denied from accessing. You should use <code>url_preview_ip_range_blacklist</code>
in preference to this, otherwise someone could define a public DNS
entry that points to a private IP address and circumvent the blacklist.
This is more useful if you know there is an entire shape of URL that
you know that will never want synapse to try to spider.</p>
<p>Optional list of URL matches that the URL preview spider is denied from
accessing. This is a usability feature, not a security one. You should use
<code>url_preview_ip_range_blacklist</code> in preference to this, otherwise someone could
define a public DNS entry that points to a private IP address and circumvent
the blacklist. Applications that perform redirects or serve different content
when detecting that Synapse is accessing them can also bypass the blacklist.
This is more useful if you know there is an entire shape of URL that you know
that you do not want Synapse to preview.</p>
<p>Each list entry is a dictionary of url component attributes as returned
by urlparse.urlsplit as applied to the absolute form of the URL. See
<a href="https://docs.python.org/2/library/urlparse.html#urlparse.urlsplit">here</a> for more