questions about http variables: flags and no_cacheable

[Manlio Perillo]

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Hi.

In my ngx_http_gateway module
http://bitbucket.org/mperillo/ngx_http_gateway
I'm implementing support for script_name and path_info variables, and I
would like to ask some questions.

* some variables have the ``NGX_HTTP_VAR_NOCACHEABLE`` flag set, however
  the get_handler set ``v->no_cacheable = 0``.

  What is the effect of setting ``v->no_cacheable = 0`` ?

* what is the purpose of the NGX_HTTP_VAR_NOHASH flag?


Thanks  Manlio
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