Created by: sebastien-rosset
Two scenarios need to be differentiated:
- HTTP requests may have an empty body, e.g. HTTP GET requests.
- HTTP requests may also have a body with the 'null' value.
We need to be able to differentiate these two cases when serializing the body. In particular, for HTTP GET request which have an empty body, the input object was set to null, and it was serialized as the 'null' value instead of the empty string.
This leads to incorrect message digest being calculated.
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