| ⇢ | A | Output added | |
| ⇢ | A | ConditionalResponse added |
| ⇢ | A | Output::__construct() added | |
| ⇢ | A | HttpResponder::getOutput() added | |
| ⇢ | A | ConditionalResponse::getOutput() added | |
| ⇢ | A | ConditionalResponse::isModified() added | |
| A | ↛ | HttpResponder::transfer304() removed | |
| A | ↛ | HttpResponder::isNotModified() removed |