Hi Thomas,
I found what was
my problem. I was passing an object whereas the Web API was expecting the array of objects. Once I changed it, the code you kindly wrote, works.
Thank you, again.
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham