Case insensitive headers

[messani]

Headers in http request should be case insensitive. Header is parsed in file RawHttpRequestReader.cs. I think that dictionary for headers should be case insensitive. Somethink like this:

var headers = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);

[chkr1011]

Hi, I am working on this library at the moment and will add this change. Best regards Christian