multipart/form-data request content type is not handled properly

[baywet]

The content serialization won't work as we don't have a serializer for it. Adding a serializer should be trivial using the natively available libraries on the platform to build the body so encoding is handled for us.

More reading

Originally reported
AB#9788

[baywet]

Some example to test https://docs.microsoft.com/en-us/graph/api/section-post-pages?view=graph-rest-1.0