Problems encountered when the API interface is used on Unreal5.0

The server cannot be connected when the HTTP call is used.I used the plugins provided by the community for UE5 and checked the code, which always failed when connecting to the server. Of course, I also wrote a function to imitate the plugins’ function, and got the same result. This went on for more than two weeks. During this period, I also searched for other plug-ins to implement GPT into Unreal5 project, but they were all stuck in this part. I want to know the reason.