Use phpstudy iis to set up php asp dual environment, php integrates ueditor, and submits the form to mysql. When using phpstudy apache mode and phpstudy NGINX mode, there is no problem in submitting long text. However, when using phpstudy iis, a 500 error appears. It seems to be a problem. It should not be caused by phpstudy, but by iis. I searched for some methods on the Internet, but none of them worked. I don’t know how to solve this problem. This server has an asp site, so it must be php asp.