Which HTTP request headers are used by Piwik PRO?

When measuring activity with the Piwik PRO tracking API, the following HTTP headers may be used:

  • Host – the hostname of the HTTP request, the hostname of the Piwik PRO server;
  • Referrer – used to track Referrer information such as website, search engine, social network;
  • User-Agent – used to detect the information about browsers, operating system, devices by the device-detector library;
  • Cookie – when Opted-out from tracking, or when Third party cookies are used;
  • Origin – used when cross-origin resource sharing is enabled;
  • Accept-Language – used to detect the users’ language;
  • X-Forwarded-Proto, X-Forwarded-Host, X-Forwarded-For – when Piwik PRO is set up behind a proxy;
  • DNT – used to detect whether a visitor’s device is opted-out from tracking.
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