feign.codec.EncodeException: Error converting request body

feign调用传入HttpServletRequest request, HttpServletResponse response 报错feign.codec.EncodeException: Error converting request body

这个问题通常是因为在传递HttpServletRequest request, HttpServletResponse response时，Feign编码器无法将它们转换为请求体。

解决方案：

1. 将HttpServletRequest request, HttpServletResponse response从参数中移除。
2. 在Feign客户端调用时，手动设置请求头、cookie等信息来替代HttpServletRequest和HttpServletResponse。

示例代码：

FeignClient接口调用的接口，这个接口接收的是HttpServletRequest参数

	@RequestMapping(value = "/getDictItems/{dictCode}", method = RequestMethod.GET)
	public Result<List<DictModel>> getDictItems(@PathVariable("dictCode") String dictCode, @RequestParam(value = "sign",required = false) String sign,HttpServletRequest request) {
		 //业务处理
		return result;
	}

FeignClient接口

通过@RequestHeader注解和@CookieValue注解手动设置了请求头和cookie信息。这样就可以避免使用HttpServletRequest和HttpServletResponse传参导致的错误。

    @GetMapping(value = "/sys/dict/getDictItems/{dictCode}")
    Result<List<DictModel>> getDictItems(@PathVariable("dictCode") String dictCode, @RequestParam(value = "sign",
            required = false) String sign, @RequestHeader("Authorization") String token,
                                         @CookieValue("SESSIONID") String sessionId);

contronller调用FeignClient的接口

controller接收的是HttpServletRequest，但是传给FeignClient接口的是token和sessionid。

@GetMapping(value = "/getDictItems/{dictCode}")
public Result<List<DictModel>> getDictItems(@PathVariable("dictCode") String dictCode,
                                            @RequestParam(value = "sign",required = false) String sign,
                                            @NotNull HttpServletRequest request) {
    
    return ddgSysClient.getDictItems(dictCode,sign,
            request.getHeader("Authorization"),
            request.getRequestedSessionId());
}