Cookie is a client cookie that is used to pseudonymously identify a particular user across multiple requests.

HeaderTitle is an HTTP header that can be returned by an upstream server to manually set the "Document Title" value.

HeaderUTMCampaign is an HTTP header that can be returned by an upstream server to manually set the "Campaign Name" value.

HeaderUTMContent is an HTTP header that can be returned by an upstream server to manually set the "Campaign Content" value.

HeaderUTMID is an HTTP header that can be returned by an upstream server to manually set the "Campaign ID" value.

HeaderUTMMedium is an HTTP header that can be returned by an upstream server to manually set the "Campaign Medium" value.

HeaderUTMSource is an HTTP header that can be returned by an upstream server to manually set the "Campaign Source" value.

HeaderUTMTerm is an HTTP header that can be returned by an upstream server to manually set the "Campaign Keyword" value.

Tracker implements a custom http.Handler that wraps another http.Handler.