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<?php echo 'test'; header('X-Custom-Header: test'); register_shutdown_function(function () { var_dump( headers_sent() ); });
Output for git.master, git.master_jit, rfc.property-hooks
test Warning: Cannot modify header information - headers already sent by (output started at /in/dScPY:2) in /in/dScPY on line 4 bool(true)

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