Our API lets you use the following headers:

• Host: The hostname of the HTTP request or the hostname of the Piwik PRO server.
• Referrer: Used to track referrer information like website, search engine or social network.
• User-Agent: Used to detect the information about browsers, operating systems, devices using a device-detector library.
• Cookie: Used to store opt-out tracking information or when third-party cookies are used.
• Origin: Used when the cross-origin resource sharing is enabled.
• Accept-Language: Used to detect the user’s browser language.
• X-Forwarded-Proto, X-Forwarded-Host, X-Forwarded-For: Used when Piwik PRO is set up behind a proxy or hybrid server-side tracking is used.