Scheme doesn't matter for local service chaining

Signed-off-by: itowlson <ivan.towlson@fermyon.com>

Author: itowlson

content/spin/v3/http-outbound.md

@@ -7,6 +7,7 @@ url = "https://github.com/fermyon/developer/blob/main/content/spin/v3/http-outbo
 
 ---
 - [Using HTTP From Applications](#using-http-from-applications)
+- [Restrictions](#restrictions)
 - [Granting HTTP Permissions to Components](#granting-http-permissions-to-components)
   - [Configuration-Based Permissions](#configuration-based-permissions)
 - [Making HTTP Requests Within an Application](#making-http-requests-within-an-application)
@@ -218,6 +219,8 @@ You must still grant permission by including the relevant `spin.internal` hosts
 allowed_outbound_hosts = ["http://authz.spin.internal", "https://reporting.spin.internal"]
 ```
 
+You may use either the `http` or `https` scheme, and the scheme in the service chaining request is ignored: only the special host name matters.
+
 To allow local chaining to _any_ component in your application, you can use a subdomain wildcard:
 
 ```toml