addUtf8Text abstract method

void addUtf8Text(List<int> bytes)

Sends a text message with the text represented by bytes.

The bytes should be valid UTF-8 encoded Unicode characters. If they are not, the receiving end will close the connection.

Source

void addUtf8Text(List<int> bytes);

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https://api.dartlang.org/stable/1.24.3/dart-io/WebSocket/addUtf8Text.html