Fixed headers to be non-case-sensetive
Fixed headers to be non-case-sensetive

int6/uhttpsharp,Code-Sharp/uHttpSharp,lstefano71/uhttpsharp,raistlinthewiz/uhttpsharp,raistlinthewiz/uhttpsharp,habibmasuro/uhttpsharp,habibmasuro/uhttpsharp,Code-Sharp/uHttpSharp,lstefano71/uhttpsharp,int6/uhttpsharp