Чтобы использовать HttpMethodConstraint, ограничение параметра маршрута "<var>X</var>" для маршрута с URL-адресом "<var>Y</var>" должно содержать строковый параметр.

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Unlocalized message

The constraint for route parameter '<var>X</var>' on the route with URL '<var>Y</var>' must have a string value in order to use an HttpMethodConstraint.

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