How can I grab content from ngx_http_request_t?

Hi all,

I am building a module which talks to my other c++ applications. So far I am able to read uri, args, content type and content length from header. But I am not sure where is the actual content stored.

E.g. I am sending stringified json through jquery, but the request_body is always empty! Don't know where to look.

Many thanks,

Shuo