项目最开始的依赖

io.github.openfeign.form

feign-form

3.0.3

io.github.openfeign.form

feign-form-spring

3.0.3

commons-fileupload

commons-fileupload

1.3.3

跟踪源码发现content-type会被”,”或”;”进行转换为Map，跟踪代码为org.apache.tomcat.util.http.fileupload.FileUploadBase#getBoundary

截图

3ecbc0062411

20191217012606545.png

在org.apache.tomcat.util.http.fileupload.FileUploadBase.FileItemIteratorImpl#FileItemIteratorImpl抛出异常

3ecbc0062411

2019121701274175.png

请求头中内容为

//用户所调用的接口提交的content-type

multipart/form-data; boundary=————————–381278542566024683689443

//经过feign转发请求后的content-type，按英文逗号拆分刚好Map没有boundary为key的值，索引报错

multipart/form-data, multipart/form-data; charset=UTF-8; boundary=16f0f6d2c45

解决方法为修改feign-form的版本

io.github.openfeign.form

feign-form-spring

3.6.0

io.github.openfeign.form

feign-form

3.6.0

commons-fileupload

commons-fileupload

1.3.3