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Size-related VCL variables

To allow better reporting, Fastly has added several variables to VCL to give more insight into what happened in a request.

Name Where Description
req.bytes_read deliver log How big a request was in total bytes.
req.header_bytes_read all How big the header of a request was in total bytes.
req.body_bytes_read deliver log How big the body of a request was in total bytes.
resp.bytes_written log How many bytes in total were sent as a response.
resp.header_bytes_written log How many bytes were written for the header of a response.
resp.body_bytes_written log How many bytes were written for body of a response.
resp.completed log Whether the response completed successfully or not.