CookiestxtSaver saves and loads cookies in the cookies.txt format.
Available option keywords are below:
`:header`
Specifies the header line not including a line feed, which is only used by #save(). None is output if nil is given. (default: `"# HTTP Cookie File"`)
`:linefeed`
Specifies the line separator (default: `"\n"`).
# File lib/http/cookie_jar/cookiestxt_saver.rb, line 22
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