Accessing HTTP request headers in nginx module

[Mapper Uno]

Thanks Maxim for your reply. Since I am newbie, please excuse my 
questions. I am still unable to retrieve the variable.

All I have in the handler routine is:  ngx_http_request_t *r
I can see that r->headers_in.headers is a list, but then
when you say $http_operation, it is confusing me.

Could you please explain

Maxim Dounin wrote in post #1141328:
> Hello!
>
> On Fri, Mar 28, 2014 at 01:06:00AM +0100, Mapper Uno wrote:
>
>> indicates that these are not "custom" headers. With reference to my
>> above example, how can I access my custom header "OPERATION" in module
>> handler ?
>
> Please make sure to read not only the first sentence.  Note the
> "Also there are other variables" in the same paragraph.  The
> $http_* variables provide access to all headers, including any
> custom ones.  And it is documented as:
>
> $http_name
> arbitrary request header field; the last part of a variable name
> is the field name converted to lower case with dashes replaced by
> underscores
>
> Therefore, you may either use the $http_operation variable to
> access the header you are looking for.  Or you may take a look at
> the source code to find out how it's implemented.  Take a look at
> the src/http/ngx_http_variables.c, functions
> ngx_http_variable_unknown_header_in() and
> ngx_http_variable_unknown_header() (first one says the header
> should be searched in r->headers_in.headers list, second one does
> actual search).
>
> --
> Maxim Dounin
> http://nginx.org/

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