Accessing HTTP request headers in nginx module

[Mapper Uno]

Hi,

I am writing a small nginx module that needs to get/parse HTTP request
header and depending on it's value, needs to be do something.

ex.  curl -X POST -H "OPERATION: add"  http://localhost:80/calc
to add 2 numbers

ex.  curl -X POST -H "OPERATION: divide" http://localhost:80/calc
to divide 2 numbers

etc..

I know in Mongoose web server's callback routine, you can easily access
custom HTTP header with an API like

const char *value = mg_get_header(connection,  "OPERATION")

I could not find such an API in nginx. How can I get this functionality
in nginx module in handler routine ? Any help would be great

Thanks

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