HeaderValue parse(String value, { String parameterSeparator: ";", String valueSeparator: null, bool preserveBackslash: false })

Creates a new header value object from parsing a header value string with both value and optional parameters.

Source 

static HeaderValue parse(String value,
                         {String parameterSeparator: ";",
                          String valueSeparator: null,
                          bool preserveBackslash: false}) {
  return _HeaderValue.parse(value,
                            parameterSeparator: parameterSeparator,
                            valueSeparator: valueSeparator,
                            preserveBackslash: preserveBackslash);
}