Someone explain to me

Hello, could someone explain or help me I still can’t understand very well but something is wrong and I don’t know why I always get this error

Use Connection: Close instead of Keep-Alive see if it’s better

the same thing happens friend I do not understand why

you hardcoded the content-length.
So if webserver is not very forgiving or you are really sending 212 bytes of content, it is a bad idea to hardcode it.
Better remove the header, so ob2 calculates it automatically

Thank you very much that was the problem and I deleted it and it works normal