Give better HTTP Responses for ContentLength limits

Currently, Pod will respond 404 Not Found for requests which body exceeds a certain value (currently 5 Mb). This is confusing for a developer that develops against this API.

Instead, Pod should be changed to respond with 400 Bad Request https://en.wikipedia.org/wiki/List_of_HTTP_status_codes#4xx_client_errors and specify the reason of the failure in the response body (any short description will do).

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