Discussion: Disable HTTP supports for MMF and Evaluator

[yfei1]

When working on #744, I realized we may need to change a bunch of files and expose some internal types to make the tests work.

After some further thoughts I am thinking about whether we really need HTTP supports for the MMFs and the Evaluators. MMF and Evaluator are customized components which won't be called directly and the only way to trigger the MMF and Evaluator is via our internal components. Therefore, disabling HTTP supports for the MMF and Evaluator won't hurt our usability and core functionalities.

@Laremere @sawagh What do you think about this proposal?