initial modified-time support

from being freed twice (a NULL free the second time)

very early, as that could leak memory before

used

memory is then freed in the function

to remove pedantic compiler warnings

warning

go weird, had to remove this. I should use trio soon for all the *printf()
stuff as this is too broken

since it has to survive http struct deletion

to return different sizes

"hang", it now results in an error instead