ENGCOM-7759: [vcl] don't explicitly hash the host header #28928

 - Merge Pull Request #28928 from gquintard/magento2:vcl_hash
 - Merged commits:
   1. 7660725
   2. 8920869

Author: magento-engcom-team

app/code/Magento/PageCache/etc/varnish4.vcl

@@ -121,13 +121,6 @@ sub vcl_hash {
         hash_data(regsub(req.http.cookie, "^.*?X-Magento-Vary=([^;]+);*.*$", "\1"));
     }
 
-    # For multi site configurations to not cache each other's content
-    if (req.http.host) {
-        hash_data(req.http.host);
-    } else {
-        hash_data(server.ip);
-    }
-
     if (req.url ~ "/graphql") {
         call process_graphql_headers;
     }

app/code/Magento/PageCache/etc/varnish5.vcl

@@ -122,13 +122,6 @@ sub vcl_hash {
         hash_data(regsub(req.http.cookie, "^.*?X-Magento-Vary=([^;]+);*.*$", "\1"));
     }
 
-    # For multi site configurations to not cache each other's content
-    if (req.http.host) {
-        hash_data(req.http.host);
-    } else {
-        hash_data(server.ip);
-    }
-
     # To make sure http users don't see ssl warning
     if (req.http./* {{ ssl_offloaded_header }} */) {
         hash_data(req.http./* {{ ssl_offloaded_header }} */);

app/code/Magento/PageCache/etc/varnish6.vcl

@@ -126,13 +126,6 @@ sub vcl_hash {
         hash_data(regsub(req.http.cookie, "^.*?X-Magento-Vary=([^;]+);*.*$", "\1"));
     }
 
-    # For multi site configurations to not cache each other's content
-    if (req.http.host) {
-        hash_data(req.http.host);
-    } else {
-        hash_data(server.ip);
-    }
-
     # To make sure http users don't see ssl warning
     if (req.http./* {{ ssl_offloaded_header }} */) {
         hash_data(req.http./* {{ ssl_offloaded_header }} */);