api/router/static: allow to specify body dst (#1486)

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

api/api.go

@@ -22,7 +22,7 @@ type Api interface {
 	String() string
 }
 
-type Options struct {}
+type Options struct{}
 
 type Option func(*Options) error
 
@@ -40,6 +40,10 @@ type Endpoint struct {
 	Method []string
 	// HTTP Path e.g /greeter. Expect POSIX regex
 	Path []string
+	// Body destination
+	// "*" or "" - top level message value
+	// "string" - inner message value
+	Body string
 	// Stream flag
 	Stream bool
 }