core, modules: Avoid error response/document handling by the core if some handler or input filter already did it while reading the request (causing a double response body).
mod_proxy_http: Use the "Connection: close" header for requests to backends not recycling connections (disablereuse), including the default reverse and forward proxies.
Submitted by: ylavic (and trawick for an old helper function) Reviewed by: rjung, covener
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