MC-15960: Separate Graphql cache handing in VCL for the /graphql area

- Modified vcls to separate graphql cache handling

Author: Prabhu Ram

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

@@ -123,11 +123,8 @@ sub vcl_hash {
         hash_data(server.ip);
     }
 
-    if (req.http.Store) {
-        hash_data(req.http.Store);
-    }
-    if (req.http.Content-Currency) {
-        hash_data(req.http.Content-Currency);
+    if (req.url ~ "graphql") {
+        call process_graphql_headers;
     }
 
     # To make sure http users don't see ssl warning
@@ -137,6 +134,15 @@ sub vcl_hash {
     /* {{ design_exceptions_code }} */
 }
 
+sub process_graphql_headers {
+    if (req.http.Store) {
+        hash_data(req.http.Store);
+    }
+    if (req.http.Content-Currency) {
+        hash_data(req.http.Content-Currency);
+    }
+}
+
 sub vcl_backend_response {
 
     set beresp.grace = 3d;

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

@@ -130,6 +130,12 @@ sub vcl_hash {
     }
     /* {{ design_exceptions_code }} */
 
+    if (req.url ~ "graphql") {
+        call process_graphql_headers;
+    }
+}
+
+sub process_graphql_headers {
     if (req.http.Store) {
         hash_data(req.http.Store);
     }