I found that on a CentOS system*1 the somehow invalid but accepted configuration sets a variable to an emtpy value, if there is no Access-Control-Request-Headers Header: SetEnvIfNoCase Access-Control-Request-Headers "^(.*)$" AccessControlAllowHeaders=$0 However, in some cases (1% of the requests without Access-Control-Request-Headers may be), the lenght of the empty value appeared to be something like 18446744073709551615 which leads to further errors in later processing of the requests. The problem appeared to be visible in json data generated by mod_WebObjects*2, it might be well possible that it's not a problem in mod_sentenvif, but seems unlikely to me. The bug needs further investigation, as it's currently unclear where mod_WebObjects get's the length from and whos responsibility it is to set it. However, i currently have no sponsor for that work, so i hope someone will pick it up. [1] httpd-2.2.15-30.el6.centos.x86_64 [2] https://github.com/wocommunity/wonder.git
There is no separate length. Can you get mod_log_config to log an incorrect value with %{Access-Control-Request-Headers}e ?
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