add Keep-Alive to the header of http

[soufiane0123]

I have the issues of "Connection closed while receiving data", I find in stackoverflow this solution https://stackoverflow.com/a/63068022/19782907

[lem8r]

http.Client already keeps persistent connection. You can pass your own http client and inject headers on the fly if you really need it.

[lem8r]

You changed only one line and already fucked up spacing and mixed single and double quotes. And made two commits. Please, stop it.