图片用iPhone拍摄的，所以打给2m左右，后台接收的时候总是null，但是换成一个小点的图片，就可以正常接受。
If you are using tomcat, the default request parameters cannot exceed 2M. It is recommended to use multipart/form data to transfer files instead.
You can upload it to CDN first, and then return the URL on the CDN to the backend.
To add to the above, I have never used java, but PHP also has restrictions on the size of form uploads. The configuration file needs to be modified. I don’t know if java is available
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
If you are using tomcat, the default request parameters cannot exceed 2M. It is recommended to use multipart/form data to transfer files instead.
You can upload it to CDN first, and then return the URL on the CDN to the backend.
To add to the above, I have never used java, but PHP also has restrictions on the size of form uploads. The configuration file needs to be modified. I don’t know if java is available