# Module elli_handler #
* [Data Types](#types)
__This module defines the `elli_handler` behaviour.__
Required callback functions: `handle/2`, `handle_event/3`.
## Data Types ##
### callback() ###
__abstract datatype__: `callback()`
A tuple of a callback_mod() and callback_args().
### callback_args() ###
__abstract datatype__: `callback_args()`
Arguments to pass to a callback_mod().
### callback_mod() ###
__abstract datatype__: `callback_mod()`
A callback module.
### event() ###
__abstract datatype__: `event()`
Fired throughout processing a request.
See [`elli_example_callback:handle_event/3`](elli_example_callback.md#handle_event-3) for descriptions.
### result() ###
result() = {elli:response_code() | ok, elli:headers(), {file, file:name_all()} | {file, file:name_all(), elli_util:range()}} | {elli:response_code() | ok, elli:headers(), elli:body()} | {elli:response_code() | ok, elli:body()} | {chunk, elli:headers()} | {chunk, elli:headers(), elli:body()} | ignore