Fix filter-related bugHEADmaster

Apparently, an Apache filter can be invoked more than once for a
single request, depending on the size of the contents [1].

Luckily, though, a filter can save state in the ctx field [1,2].

The solution isn't perfect, as it can't handle arbitrary long heads,
but they're very unlikely.

[1] https://httpd.apache.org/docs/2.4/developer/output-filters.html#invocation
[2] https://perl.apache.org/docs/2.0/user/handlers/filters.html#Introducing_Filters

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