| InjectContentTypeTrait | |
| SapiEmitterTrait |
| EmitterInterface |
| ArraySerializer | Serialize or deserialize response messages to/from arrays. |
| EmptyResponse | A class representing empty HTTP responses. |
| HtmlResponse | HTML response. |
| JsonResponse | JSON response. |
| RedirectResponse | Produce a redirect response. |
| SapiEmitter | |
| SapiStreamEmitter | |
| Serializer | Provides base functionality for request and response de/serialization strategies, including functionality for retrieving a line at a time from the message, splitting headers from the body, and serializing headers. |
| TextResponse | Plain text response. |
| XmlResponse | XML response. |
