The preferences that w3m can apply to the matched url. Options are: substitute_url "<destination-url>", url_charset <charset>, no_referer_from on|off, no_referer_to on|off, user_agent "string".
substitute_url "<destination-url>"
url_charset <charset>
no_referer_from on|off
no_referer_to on|off
user_agent "string"
list of string
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