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According to the spec for URL, can the scheme have an underscore? E.g., is web_view://example.com a valid URL?

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No.

A valid RFC 3986 URL scheme must consist of "a letter and followed by any combination of letters, digits, plus ("+"), period ("."), or hyphen ("-")."

    scheme      = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
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