Visual FoxPro Requires Chilkat v11.0.0+

HTTPS Server Certificate Require Hostname Match

See more HTTP Examples

Demonstrates and explains the RequireHostnameMatch property. Visual FoxPro

LOCAL loHttp
LOCAL lcHtml

*  The RequireHostnameMatch property was added in Chilkat v11.0.0
*  to ensure the URL's hostname matches at least one of the server certificate SAN's (Subject Alternative Names)
*  
*  In actuality, it is the SNI hostname that must match.  If the SNI hostname is not explicitly set,
*  then Chilkat uses the hostname from the URL as the SNI hostname.

*  Here's an example using chilkatsoft.com
*  The SSL server certificate for chilkatsoft.com has 2 Subject Alternative Names:
*  
*  1) DNS Name: *.chilkatsoft.com
*  2) DNS Name: chilkatsoft.com
*  
*  See Explaining the SNI Hostname in TLS

loHttp = CreateObject('Chilkat.Http')

loHttp.RequireHostnameMatch = 1

*  This should succeed because "www.chilkatsoft.com" matches the SAN entry "*.chilkatsoft.com"
lcHtml = loHttp.QuickGetStr("https://www.chilkatsoft.com/helloWorld.html")
? "1) Succeeded: " + STR(loHttp.LastMethodSuccess)

*  At the time of writing this example, the IP address for chilkatsoft.com is 3.101.18.47
*  If we send the request using the IP address, it will fail because the IP address is does 
*  not match any of the SAN entries in the server certificate.
lcHtml = loHttp.QuickGetStr("https://3.101.18.47/helloWorld.html")
? "2) Succeeded: " + STR(loHttp.LastMethodSuccess)

*  However, it will succeed if we explicitly set the SNI hostname.
loHttp.SniHostname = "www.chilkatsoft.com"
lcHtml = loHttp.QuickGetStr("https://3.101.18.47/helloWorld.html")
? "3) Succeeded: " + STR(loHttp.LastMethodSuccess)

*  Remove our explicit SNI hostname.
loHttp.SniHostname = ""

*  Now let's try wrong.host.badssl.com
*  The SSL server certificate for badssl.com has 2 Subject Alternative Names:
*  
*  1) DNS Name: *.badssl.com
*  2) DNS Name: badssl.com

*  The domain wrong.host.badssl.com will fail the RequireHostnameMatch because
*  the wildcarded domain SAN entry only extends 1 level deep.  
lcHtml = loHttp.QuickGetStr("https://wrong.host.badssl.com/")
? "4) Succeeded: " + STR(loHttp.LastMethodSuccess)

*  The expected output is:
*  1) Succeeded: True
*  2) Succeeded: False
*  3) Succeeded: True
*  4) Succeeded: False

RELEASE loHttp