ServiceMetadataBehavior 的 HttpGetEnabled 属性设置为 True，而 HttpGetUrl 属性是相对地址，但没有 http 基址。请提供 http 基址或将 HttpGetUrl 设置为绝对地址。

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The HttpGetEnabled property of ServiceMetadataBehavior is set to true and the HttpGetUrl property is a relative address, but there is no http base address. Either supply an http base address or set HttpGetUrl to an absolute address.

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