| ⇢ | A | UtmSource added | |
| ⇢ | A | RequestHeader added |
| ⇢ | A | RequestHeader::getReferer() added | |
| ⇢ | A | UtmSource::getReferer() added | |
| ⇢ | A | InvalidConfiguration::emptySessionKey() added | |
| C | ↗ | A | Referer::determineFromRequest() improved |
| A | ↛ | Referer::shouldCapture() removed | |
| A | ↛ | InvalidConfiguration::emptyKey() removed |