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----
-title: safeURL
-description: Declares the provided string as a safe URL or URL substring.
-godocref: https://golang.org/pkg/html/template/#HTMLEscape
-date: 2017-02-01
-publishdate: 2017-02-01
-lastmod: 2017-02-01
-keywords: [strings,urls]
-categories: [functions]
-menu:
-  docs:
-    parent: "functions"
-signature: ["safeURL INPUT"]
-workson: []
-hugoversion:
-relatedfuncs: []
-deprecated: false
-aliases: []
----
-
-`safeURL` declares the provided string as a "safe" URL or URL substring (see [RFC 3986][]). A URL like `javascript:checkThatFormNotEditedBeforeLeavingPage()` from a trusted source should go in the page, but by default dynamic `javascript:` URLs are filtered out since they are a frequently exploited injection vector.
-
-Without `safeURL`, only the URI schemes `http:`, `https:` and `mailto:` are considered safe by Go templates. If any other URI schemes (e.g., `irc:` and `javascript:`) are detected, the whole URL will be replaced with `#ZgotmplZ`. This is to "defang" any potential attack in the URL by rendering it useless.
-
-The following examples use a [site `config.toml`][configuration] with the following [menu entry][menus]:
-
-{{< code file="config.toml" copy="false" >}}
-[[menu.main]]
-    name = "IRC: #golang at freenode"
-    url = "irc://irc.freenode.net/#golang"
-{{< /code >}}
-
-The following is an example of a sidebar partial that may be used in conjunction with the preceding front matter example:
-
-{{< code file="layouts/partials/bad-url-sidebar-menu.html" copy="false" >}}
-<!-- This unordered list may be part of a sidebar menu -->
-<ul>
-  {{ range .Site.Menus.main }}
-  <li><a href="{{ .URL }}">{{ .Name }}</a></li>
-  {{ end }}
-</ul>
-{{< /code >}}
-
-This partial would produce the following HTML output:
-
-{{< output file="bad-url-sidebar-menu-output.html" >}}
-<!-- This unordered list may be part of a sidebar menu -->
-<ul>
-    <li><a href="#ZgotmplZ">IRC: #golang at freenode</a></li>
-</ul>
-{{< /output >}}
-
-The odd output can be remedied by adding ` | safeURL` to our `.Title` page variable:
-
-{{< code file="layouts/partials/correct-url-sidebar-menu.html" copy="false" >}}
-<!-- This unordered list may be part of a sidebar menu -->
-<ul>
-    <li><a href="{{ .URL | safeURL }}">{{ .Name }}</a></li>
-</ul>
-{{< /code >}}
-
-With the `.URL` page variable piped through `safeURL`, we get the desired output:
-
-{{< output file="correct-url-sidebar-menu-output.html" >}}
-<ul class="sidebar-menu">
-    <li><a href="irc://irc.freenode.net/#golang">IRC: #golang at freenode</a></li>
-</ul>
-{{< /output >}}
-
-[configuration]: /getting-started/configuration/
-[menus]: /content-management/menus/
-[RFC 3986]: http://tools.ietf.org/html/rfc3986