Possibility to suppress the HTTP Date header field

I am writing a small application that emulates electrical meters like the Everhome EcoTracker. Therefore, I am using Pekko and Pekko Http.

The emulated EcoTracker device has the absolute non-standard behavior of not providing a Date header field in its HTTP responses. I guess the main reason for that is that the device has no date/time information. Unfortunately, some battery storages rely on an HTTP response with exactly the two HTTP header fields content-type and content-length.

With the current Pekko HTTP version, I am not able to suppress the Date header field. It is always automatically added. I am thinking about an additional configuration parameter that allows suppressing the Date header in a similar manner as it is possible with der Server header field.

I would volunteer to implement that feature and provide a PR. I just wanted to first check if such a PR has the chance to be accepted or if it would be refused since such a behavior is absolutely non-standard.

Start by locating Pekko HTTP's automatic Date-header handling and the existing configuration for suppressing the Server header. Add a configuration option for omitting Date, and cover the behavior with regression tests for responses with and without the option enabled.

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