http: name anonymous functions in _http_server

[maasencioh]

Checklist

• commit message follows commit guidelines

Description of change

Ref: #8913

[MylesBorins]

@maasencioh if you are going to be submitting a large number of these changes it might make sense to group them, even if they are still separate commits. I would say likely a single PR per subsystem would make sense.

I think we may have originally suggested only submitting a single file so that we could get on the same page about what these changes should be

[maasencioh]

@thealphanerd I thought that you need different PR per file too, but if you agree then I could make a single PR with http files then

[maasencioh]

@thealphanerd I move them to #9055, thanks for the advise