Installing a tag on a site with CSP

The tag code generated by Yandex Metrica is intended for inline insertion in the pages' HTML code. On sites that use Content Security Policy technology, this code will not run unless you take specific steps. In particular, you'll have to use the HTTP header to give the browser permission to process data. The HTTP header should include the src-script directive with the nonce attribute (this requires signing the contents of the script element) and the img-src directive for processing the contents of the noscript element.

In addition, Yandex Metrica offers another way of enabling the code snippet: placing only the contents of the noscript element in the HTML code of the pages and moving the contents of the script element to an external script (for example, to a JS file).

No matter which method you choose, you must modify the HTTP header to add permission to access Yandex Metrica.

Inserting the tag code in the HTML code of site pages

If you want to use this method, the Content-Security-Policy or Content-Security-Policy-Report-Only HTTP header must contain the following directives:

• script-src with the nonce attribute. This attribute must contain a string value with a random sequence of characters (Latin letters and numbers). This value must be generated randomly on the server separately for each request.

  Content-Security-Policy: script-src 'nonce-<character sequence>';
  

  The same character sequence must be contained in the nonce attribute in the script element for the counter code on the site's pages.

  ...
  <!-- Yandex.Metrika counter -->
  <script type="text/javascript" nonce="<character sequence>">
      (function(m,e,t,r,i,k,a){m[i]=m[i]||function(){(m[i].a=m[i].a||
      []).push(arguments)};
  ...
  

• img-src to allow for processing the noscript element contents.

  Content-Security-Policy: img-src https://mc.yandex.ru;
  

• connect-src for connecting to Yandex Metrica.

  Content-Security-Policy: connect-src https://mc.yandex.ru;
  

• child-src with the string blob: https://mc.yandex.ru for Session Replay, click maps, link maps, and scroll maps to work properly.

  Content-Security-Policy: child-src blob: https://mc.yandex.ru;
  

• frame-src with the string blob: https://mc.yandex.ru for Session Replay, click maps, link maps, and scroll maps to work properly.

  Content-Security-Policy: frame-src blob: https://mc.yandex.ru;
  

• frame-ancestors with the string blob: https://mc.yandex.ru for Session Replay, click maps, link maps, and scroll maps to work properly.

  Content-Security-Policy: frame-ancestors blob: https://mc.yandex.ru;
  

Example of the HTTP header when using this method:

Content-Security-Policy:
 ...
 img-src https://mc.yandex.ru;
 script-src https://mc.yandex.ru https://yastatic.net 'nonce-<character sequence>';
 connect-src https://mc.yandex.ru;
 ...

Using an external script to connect the tag code

If you're using this method, the Content-Security-Policy or Content-Security-Policy-Report-Only HTTP header can have a general set of directives, including rules for data import from Yandex Metrica:

• script-src to allow scripts to be processed.

  Content-Security-Policy: script-src https://mc.yandex.ru https://yastatic.net;
  

• img-src to allow for processing the noscript element contents.

  Content-Security-Policy: img-src https://mc.yandex.ru;
  

• connect-src for connecting to Yandex Metrica.

  Content-Security-Policy: connect-src https://mc.yandex.ru;
  

• child-src with the string blob: https://mc.yandex.ru for Session Replay, click maps, link maps, and scroll maps to work properly.

  Content-Security-Policy: child-src blob: https://mc.yandex.ru;
  

• frame-src with the string blob: https://mc.yandex.ru for Session Replay, click maps, link maps, and scroll maps to work properly.

  Content-Security-Policy: frame-src blob: https://mc.yandex.ru;
  

Example of the HTTP header when using this method:

Content-Security-Policy:
 ...
 img-src https://mc.yandex.ru;
 script-src 'self' https://mc.yandex.ru https://yastatic.net;
 connect-src https://mc.yandex.ru;
 ...

The example below enables the JavaScript code in an external JS file. Only the script element with the src attribute needs to be added to the HTML code of the site's pages. This attribute must contain the path to the file (for example, metrika.js).

<script type="text/javascript" src="/metrika.js"></script>

1. In the Yandex Metrica interface, go to Settings > Tag and copy the contents of the script element from the field.

2. Add this code to the metrika.js file.

   Example of file contents

   (function(m,e,t,r,i,k,a){m[i]=m[i]||function(){(m[i].a=m[i].a||
   []).push(arguments)};
       m[i].l=1*new Date();k=e.createElement(t),a=e.getElementsByTagName(t)
   [0],k.async=1,k.src=r,a.parentNode.insertBefore(k,a)})
       (window, document, "script", "https://mc.yandex.ru/metrika/tag.js", "ym")
       ym(XXXXXX, "init", {
           id:XXXXXX,
           clickmap:true,
           trackLinks:true,
           accurateTrackBounce:true
       });
   

   Where XXXXXX is a Yandex Metrica tag number.

3. In order for the tag to collect data on users who have JavaScript disabled, add the content of the noscript element to the HTML code of the site's pages:

   <noscript><div><img src="https://mc.yandex.ru/watch/XXXXXX" style="position:absolute; left:-9999px;" alt="" /></div></noscript> 
   

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