diff --git a/config/config.go b/config/config.go
index b47acf8ee..d013d5a5b 100644
--- a/config/config.go
+++ b/config/config.go
@@ -44,7 +44,7 @@ func Load(filename string, input io.Reader) (Group, error) {
 	// Each server block represents similar hosts/addresses.
 	// Iterate each server block and make a config for each one,
 	// executing the directives that were parsed.
-	for _, sb := range serverBlocks {
+	for i, sb := range serverBlocks {
 		onces := makeOnces()
 
 		for _, addr := range sb.Addresses {
@@ -75,6 +75,8 @@ func Load(filename string, input io.Reader) (Group, error) {
 							})
 							return err
 						},
+						ServerBlockIndex: i,
+						ServerBlockHosts: sb.HostList(),
 					}
 
 					midware, err := dir.setup(controller)
diff --git a/config/parse/parsing.go b/config/parse/parsing.go
index 6ec04dced..594553913 100644
--- a/config/parse/parsing.go
+++ b/config/parse/parsing.go
@@ -312,3 +312,15 @@ type (
 		Host, Port string
 	}
 )
+
+// HostList converts the list of addresses (hosts)
+// that are associated with this server block into
+// a slice of strings. Each string is a host:port
+// combination.
+func (sb serverBlock) HostList() []string {
+	sbHosts := make([]string, len(sb.Addresses))
+	for j, addr := range sb.Addresses {
+		sbHosts[j] = net.JoinHostPort(addr.Host, addr.Port)
+	}
+	return sbHosts
+}
diff --git a/config/setup/controller.go b/config/setup/controller.go
index d0b0ee89e..eb9b90cfc 100644
--- a/config/setup/controller.go
+++ b/config/setup/controller.go
@@ -24,6 +24,15 @@ type Controller struct {
 	// (not deferred) and may return an error which is
 	// returned by OncePerServerBlock.
 	OncePerServerBlock func(f func() error) error
+
+	// ServerBlockIndex is the 0-based index of the
+	// server block as it appeared in the input.
+	ServerBlockIndex int
+
+	// ServerBlockHosts is a list of hosts that are
+	// associated with this server block. All these
+	// hosts, consequently, share the same tokens.
+	ServerBlockHosts []string
 }
 
 // NewTestController creates a new *Controller for