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HTTP 客户端库 `ehttpc` 升级到 0.4.7。
在升级前,如果 HTTP 客户端,例如 认证,授权,webhook 等配置中使用了content-type HTTP 头,但是没有配置 body,则可能会发生异常。
详情见 [ehttpc PR#44](https://github.com/emqx/ehttpc/pull/44)。