Treat HTTP::Request body as IO. Fixes #257

src/kemal/context.cr

@@ -9,7 +9,11 @@ class HTTP::Server
 
     def params
       @request.url_params ||= route_lookup.params
-      @params ||= Kemal::ParamParser.new(@request)
+      @params ||= if @request.param_parser
+                    @request.param_parser.not_nil!
+                  else
+                    Kemal::ParamParser.new(@request)
+                  end
     end
 
     def redirect(url, status_code = 302)

src/kemal/param_parser.cr

@@ -75,8 +75,20 @@ module Kemal
       end
     end
 
-    def parse_part(part)
-      HTTP::Params.parse(part.to_s || "")
+    def parse_part(part : IO?)
+      if part
+        HTTP::Params.parse(part.gets_to_end)
+      else
+        HTTP::Params.parse("")
+      end
+    end
+
+    def parse_part(part : String?)
+      if part
+        HTTP::Params.parse(part.to_s)
+      else
+        HTTP::Params.parse("")
+      end
     end
   end
 end

src/kemal/request.cr

@@ -2,6 +2,7 @@
 class HTTP::Request
   property override_method
   property url_params : Hash(String, String)?
+  getter param_parser : Kemal::ParamParser?
 
   def override_method
     @override_method ||= check_for_method_override!
@@ -18,7 +19,8 @@ class HTTP::Request
   private def check_for_method_override!
     @override_method = @method
     if @method == "POST"
-      params = Kemal::ParamParser.new(self).body
+      @param_parser = Kemal::ParamParser.new(self)
+      params = @param_parser.not_nil!.body
       if params.has_key?("_method") && HTTP::Request.override_method_valid?(params["_method"])
         @override_method = params["_method"]
       end