openfeign 转发post 接口 错误 Incomplete output stream executing POST http://xxxx

问题描述

当采用feign转发 post请求时，报错

 /**
     * 转发post
     *
     * @param uri  url
     * @param body data
     * @return
     */
    @RequestLine("POST")
    ResponseResult<Object> forwardPost(URI uri, @Param Object body);

转发服务定义了拦截

 .requestInterceptor(requestTemplate -> {
      // 装配请求体 header
     ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
     assert attributes != null;
     HttpServletRequest request = attributes.getRequest();
     Enumeration<String> headerNames = request.getHeaderNames();
     if (Objects.nonNull(headerNames)) {       
     	while (headerNames.hasMoreElements()) {
           String key = headerNames.nextElement();       
           String values = request.getHeader(key);
           requestTemplate.header(key, values);       
  	  	}
    } else {
  		 requestTemplate.header("error", "no header");
   	  }
  })

运行就报错

Incomplete output stream executing POST http://localhost:8080/hello/obj"

经过验证发现是
自定义 requestTemplate 添加请求头，导致post类型请求循环调用，报错
百度找不到原因，
很多都在说添加依赖

<dependency>
	<groupId>io.github.openfeign</groupId>
	<artifactId>feign-httpclient</artifactId>
</dependency>

配置

feign:
  httpclient:
    enabled: true # 默认就是true

这个解决不了本文问题

最终必应搜到github有解答

headers.remove("content-length");
it work
# 链接
https://github.com/spring-cloud/spring-cloud-openfeign/issues/390
remove the header param content-length can resolve it

解决方案，不要添加"content-length"

// feign源码问题，带"content-length" 会报错
if (!"content-length".equals(key)) {
    String values = request.getHeader(key);
    requestTemplate.header(key, values);
}