Route declaration must start with / fixes #242

src/kemal/dsl.cr

@@ -5,11 +5,13 @@ HTTP_METHODS = %w(get post put patch delete options)
 
 {% for method in HTTP_METHODS %}
   def {{method.id}}(path, &block : HTTP::Server::Context -> _)
+  	raise Kemal::Exceptions::PathStartInvalidException.new({{method}}, path) unless Kemal::Utils.path_starts_with_backslash?(path)
     Kemal::RouteHandler::INSTANCE.add_route({{method}}.upcase, path, &block)
   end
 {% end %}
 
 def ws(path, &block : HTTP::WebSocket, HTTP::Server::Context -> Void)
+  raise Kemal::Exceptions::PathStartInvalidException.new("ws", path) unless Kemal::Utils.path_starts_with_backslash?(path)
   Kemal::WebSocketHandler.new path, &block
 end
 

src/kemal/exceptions.cr

@@ -1,5 +1,11 @@
 # Exceptions for 404 and custom errors are defined here.
 module Kemal::Exceptions
+  class PathStartInvalidException < Exception
+    def initialize(method, path)
+      super "Route declaration #{method} \"#{path}\" needs to start with '/', should be #{method} \"/#{path}\""
+    end
+  end
+
   class RouteNotFound < Exception
     def initialize(context)
       super "Requested path: '#{context.request.override_method.as(String)}:#{context.request.path}' was not found."

src/kemal/helpers/utils.cr

@@ -0,0 +1,7 @@
+module Kemal
+  class Utils
+    def self.path_starts_with_backslash?(path)
+      path.starts_with?("/")
+    end
+  end
+end