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<?php var_dump(get_headers("http://kubo2.wz.sk"));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: get_headers(): php_network_getaddresses: getaddrinfo for kubo2.wz.sk failed: System error in /in/jbcNm on line 2 Warning: get_headers(http://kubo2.wz.sk): Failed to open stream: php_network_getaddresses: getaddrinfo for kubo2.wz.sk failed: System error in /in/jbcNm on line 2 bool(false)

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