Find a public program: link Such a proxy may be easy to find the problem. I use the zip package downloaded from the above project, directly extracted to the WEB working directory of the test frankenphp, replace the working file, that is, the frankenphp server has not changed, but the server web page has changed. When the agent has a dynamic web page with video, no matter what version, the package change 1.4.0 version, must be "Segmentation fault" exit. But according to the method found by PHP programmers over here, once you set only single thread in Caddyfile, i.e. set "num_threads 1", there is a high probability that "Segmentation fault" will not occur, and it is possible to use this github project from the present! frankenphp problem solution.