Elli middleware adding the Date header.
This Elli middleware adds the "Date" header to responses. The current date string is cached in an ETS-table and updated once a second. The impact on performance is very low, if noticeable at all.
According to the HTTP 1.1 specification, the "Date" header in each response is required.
To use elli_date, just add it to your mods in your elli_middleware
Config.
Config = [
          {mods, [
                  {elli_date, []},
                  %% ...,
                 ]}
         ],
elli:start_link([
                 %% ...,
                 {callback, elli_middleware},
                 {callback_args, Config}
                ]).