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Let's save log.Error for things the user can take action on.
Moved all our diagnostics to log.Debug. We can ideally reduce them
even further.

squash! commands/files: Added PeekFile and StatFile interfaces

commands/http: Updated test

squash! commands: Added Length field to Response

commands/http: client: Fixed error on unset length

@mappum would this work?

cc @mappum can we do this for the copyChunks case?

using Header().Set after WriteHeader() has no effect.
cc @mappum