Remove /static/a endpoint

The code for this was removed from static in
alphagov/static#2152 and thus this endpoint is
not used anymore. The 802 status response in this host was only used by
this endpoint so can also be removed.

spec/test-outputs/assets-integration.out.vcl

@@ -68,11 +68,6 @@ sub vcl_recv {
      error 801 "Force SSL";
   }
 
-  # Serve and log an empty response for analytics purposes
-  if (req.url ~ "^/static/a\?") {
-     error 802 "OK";
-  }
-
   # Serve from stale for 24 hours if origin is sick
   set req.grace = 24h;
 
@@ -176,14 +171,6 @@ sub vcl_error {
     return (deliver);
   }
 
-  if (obj.status == 802) {
-    set obj.http.Content-Type = "text/plain";
-    set obj.http.Access-Control-Allow-Origin = "*";
-    set obj.status = 200;
-    synthetic {""};
-    return(deliver);
-  }
-
   # Serve stale from error subroutine as recommended in:
   # https://docs.fastly.com/guides/performance-tuning/serving-stale-content
   # The use of `req.restarts == 0` condition is to enforce the restriction

spec/test-outputs/assets-production.out.vcl

@@ -169,11 +169,6 @@ sub vcl_recv {
      error 801 "Force SSL";
   }
 
-  # Serve and log an empty response for analytics purposes
-  if (req.url ~ "^/static/a\?") {
-     error 802 "OK";
-  }
-
   # Serve from stale for 24 hours if origin is sick
   set req.grace = 24h;
 
@@ -328,14 +323,6 @@ sub vcl_error {
     return (deliver);
   }
 
-  if (obj.status == 802) {
-    set obj.http.Content-Type = "text/plain";
-    set obj.http.Access-Control-Allow-Origin = "*";
-    set obj.status = 200;
-    synthetic {""};
-    return(deliver);
-  }
-
   # Serve stale from error subroutine as recommended in:
   # https://docs.fastly.com/guides/performance-tuning/serving-stale-content
   # The use of `req.restarts == 0` condition is to enforce the restriction

spec/test-outputs/assets-staging.out.vcl

@@ -169,11 +169,6 @@ sub vcl_recv {
      error 801 "Force SSL";
   }
 
-  # Serve and log an empty response for analytics purposes
-  if (req.url ~ "^/static/a\?") {
-     error 802 "OK";
-  }
-
   # Serve from stale for 24 hours if origin is sick
   set req.grace = 24h;
 
@@ -328,14 +323,6 @@ sub vcl_error {
     return (deliver);
   }
 
-  if (obj.status == 802) {
-    set obj.http.Content-Type = "text/plain";
-    set obj.http.Access-Control-Allow-Origin = "*";
-    set obj.status = 200;
-    synthetic {""};
-    return(deliver);
-  }
-
   # Serve stale from error subroutine as recommended in:
   # https://docs.fastly.com/guides/performance-tuning/serving-stale-content
   # The use of `req.restarts == 0` condition is to enforce the restriction

vcl_templates/assets.vcl.erb

@@ -188,11 +188,6 @@ sub vcl_recv {
      error 801 "Force SSL";
   }
 
-  # Serve and log an empty response for analytics purposes
-  if (req.url ~ "^/static/a\?") {
-     error 802 "OK";
-  }
-
   # Serve from stale for 24 hours if origin is sick
   set req.grace = 24h;
 
@@ -347,14 +342,6 @@ sub vcl_error {
     return (deliver);
   }
 
-  if (obj.status == 802) {
-    set obj.http.Content-Type = "text/plain";
-    set obj.http.Access-Control-Allow-Origin = "*";
-    set obj.status = 200;
-    synthetic {""};
-    return(deliver);
-  }
-
   # Serve stale from error subroutine as recommended in:
   # https://docs.fastly.com/guides/performance-tuning/serving-stale-content
   # The use of `req.restarts == 0` condition is to enforce the restriction