Unhandled exception. System.FormatException: The format of value '<null>' is invalid. at System.Net.Http.Headers.HttpHeaderParser.ParseValue(String value, Object storeValue, Int32& index) at System.Net.Http.Headers.HttpHeaders.ParseAndAddValue(HeaderDescriptor descriptor, HeaderStoreItemInfo info, String value) at System.Net.Http.Headers.HttpHeaders.Add(HeaderDescriptor descriptor, String value) at System.Net.Http.Headers.HttpHeaders.Add(String name, String value)
HttpHeaders.Add(string, IEnumerable<string?>)
HttpHeaders.Add(string, string?)
Unhandled exception. System.FormatException: The format of value '' is invalid. at System.Net.Http.Headers.HttpHeaderParser.ParseValue(String value, Object storeValue, Int32& index) at System.Net.Http.Headers.HttpHeaders.ParseAndAddValue(HeaderDescriptor descriptor, HeaderStoreItemInfo info, String value) at System.Net.Http.Headers.HttpHeaders.Add(HeaderDescriptor descriptor, String value) at System.Net.Http.Headers.HttpHeaders.Add(String name, String value)