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Called once before the body is processed.
void on_body_init_impl( boost::optional< std::uint64_t > const& content_length, error_code& ec);
This virtual function is invoked once, before the content body is processed (but after the complete header is received).
| Name | Description | 
|---|---|
| 
                     | 
                    A value representing the content length in bytes if the length
                    is known (this can include a zero length). Otherwise, the value
                    will be  | 
| 
                     | An output parameter which the function may set to indicate an error. The error will be clear before this function is invoked. |