2.2.1.2.3 User-Agent
The User-Agent request-header field contains information about the user agent originating the request.
User-Agent = "User-Agent:" 1*product CRLF; as specified in [RFC1945], section 10.15
product = 1*CHAR
The client sets the token value to "Mozilla/4.0 (compatible; MSIE 5.5; Win32)", but the implementer of the HTTP Encapsulation of SSTP Protocol can choose to use their product name as token value<2>.
Example: User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Win32)