If you like to have SSL with security, you need to verify the certificate. FileMaker comes with a root certificate file, so we can refer CURL to that file and enjoy the checks against the given list of root certificates:

Set Variable [ $curl ; Value: MBS("CURL.New") ] 

# 

If [ MBS("IsIOS") ] 

# look for path to certificate file

Set Variable [ $path ; Value: Substitute(MBS("Folders.UserDocuments"); "/Documents"; "/Library/Application Support/FileMaker/iOS/1.0/root.pem") ] 

If [ MBS("Files.FileExists"; $path) ] 

# use in CURL

Set Variable [ $r ; Value: MBS( "CURL.SetOptionCAINFO"; $curl; $path) ] 

Else

Show Custom Dialog [ "File not found." ; $path ] 

End If

Else If [ MBS("IsMacOSX") ] 

# look for path to certificate file

Set Variable [ $path ; Value: Substitute(MBS("Folders.UserDocuments"); "/Documents"; "/Library/Application Support/FileMaker/Shared/17.0/root.pem") ] 

If [ MBS("Files.FileExists"; $path) ] 

# use in CURL

Set Variable [ $r ; Value: MBS( "CURL.SetOptionCAINFO"; $curl; $path) ] 

Else

Show Custom Dialog [ "File not found." ; $path ] 

End If

Else If [ MBS("IsWindows") ] 

# look for path to certificate file

Set Variable [ $path ; Value: Substitute(MBS("Folders.UserDocuments"); "\Documents"; "\AppData\Local\FileMaker\FileMaker Pro Advanced\17.0\root.pem") ] 

If [ MBS("Files.FileExists"; $path) ] 

# use in CURL

Set Variable [ $r ; Value: MBS( "CURL.SetOptionCAINFO"; $curl; $path) ] 

Else

Show Custom Dialog [ "File not found." ; $path ] 

End If

Else If [ MBS("IsLinux") ] 

# look for path to certificate file

Set Variable [ $path ; Value: "/FileMakerData/Extensions/OpenSSL/root.pem" ] 

# use in CURL

Set Variable [ $r ; Value: MBS( "CURL.SetOptionCAINFO"; $curl; $path) ] 

End If

# 

# Start new session

Set Variable [ $URL ; Value: "https://www.filemaker.com" ] 

# Set URL to load (HTTP, HTTPS, FTP, FTPS, SFTP, etc.)

Set Variable [ $result ; Value: MBS("CURL.SetOptionURL"; $curl; $URL) ] 

// Set Variable [ $result ; Value: MBS( "CURL.SetOptionCertInfo"; $curl; 1 ) ] 

# Do transfer now:

Set Field [ PlaceHolder::result ; MBS("CURL.Perform"; $curl) ] 

# Check result

Set Field [ PlaceHolder::Container ; MBS("CURL.GetResultAsText"; $curl; "UTF8") ] 

Set Field [ PlaceHolder::result ; MBS("CURL.GetDebugAsText"; $curl) ] 

// Set Field [ PlaceHolder::result ; MBS("CURL.GetCertinfo"; $curl; "UTF8") ] 

# Cleanup

Set Variable [ $result ; Value: MBS("CURL.Cleanup"; $curl) ] 

This script works fine with MacOS, Windows, Linux and iOS. If needed you can request certificate information via CURL.SetOptionCertInfo and see all the details from certificates in the text given by CURL.GetCertinfo function.