報錯之前：
@RequestMapping(value = "hi", method = RequestMethod.GET)
String hiService(@RequestParam String name);
修改之后：
@RequestMapping(value = "hi", method = RequestMethod.GET)
String hiService(@RequestParam(name = "name") String name);
問題解決
spring cloud feign：Caused by: java.lang.IllegalStateException: RequestParam.value() was empty on parameter 0
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