Nginx FastCGI question

[Ensiferous]

In addition to what Maxim said some people do not realize that not all
headers are created equally and that something as inane as underscores
versus dashes causes it to break RFC and nginx need you to explicitly tell
it that that's okay:
http://nginx.org/en/docs/http/ngx_http_core_module.html#underscores_in_headers

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,234608,234616#msg-234616