A unique key is a column or a set of columns that can uniquely identify a row in a table. So, a unique key is constraint such that no two values of it are equal. Unique key
allows only a single NULL value in that column. Depending on the design
of a database, a table may have more than one unique key.
In my application it was an issue because client was encoding the body content.But I was not specifying the encoding or media type. I have specified and resolved the issue as below var content = new StringContent ( postData , Encoding . UTF8 , "application/json" ); httpClient . PostAsync ( uri , content );
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