067b04aaf1
Summary: We write some synthetic HTTP responses inside unit tests. Some responses have an indirect side effect of adjusting "zlib.output_compression", but this adjustment fails if headers have already been output. From a CLI context, headers appear to count as already-output after we write anything to stdout: ``` <?php echo headers_sent() ? "Y" : "N"; echo "\n"; echo headers_sent() ? "Y" : "N"; echo "\n"; ``` This script prints "N", then "Y". Recently, the default severity of warnings was increased in libphutil; this has been a long-standing warning but now causes test failures. This behavior is sort of silly but the whole thing is kind of moot anyway. Just skip it if "headers_sent()" is true. Test Plan: Ran "arc unit --everything", got clean results. Differential Revision: https://secure.phabricator.com/D21055
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