How to write Cyrillic to file using log4net appender?

Question

.NET

Good afternoon, dear colleagues.

The project uses log4net.

There was a need to write an API response to the log, which sends a message in Cyrillic. In response header ContentType = "text/json;charset=utf-8"

using (Stream stream = response.GetResponseStream())
            {
                using (StreamReader reader = new StreamReader(stream))
                {
                    answer = reader.ReadToEnd();
                    Logger.Debug(answer);
                    File.AppendAllText("Logs/msg.txt", answer);
                }
            }

Everything is as it should be in msg.txt:

{"ErrorMessage":"Service not available"}

In the log like this:

2020-07-09 16:16:31,279 DEBUG {"ErrorMessage":"???????????????????????"}

Answer 1

encoding - set, for example, to utf-8 - this is an honest and universal option,
or encode answer in win1251 with possible ambushes when answer arrives, for example, in Estonian)