X-Git-Url: http://nitlanguage.org

diff --git a/lib/nitcorn/http_response.nit b/lib/nitcorn/http_response.nit
index b80fb7b..97276ca 100644
--- a/lib/nitcorn/http_response.nit
+++ b/lib/nitcorn/http_response.nit
@@ -39,7 +39,7 @@ class HttpResponse
 	var header = new HashMap[String, String]
 
 	# Body of this response
-	var body = "" is writable
+	var body: Writable = "" is writable
 
 	# Files appended after `body`
 	var files = new Array[String]
@@ -50,7 +50,20 @@ class HttpResponse
 		# Set the content length if not already set
 		if not header.keys.has("Content-Length") then
 			# Size of the body
-			var len = body.byte_length
+			var len
+			var body = self.body
+			if body isa Text then
+				len = body.byte_length
+			else if body isa Bytes then
+				len = body.length
+			else
+				# We need the length, but there is no length in a writable.
+				# So just render it as a bytes then measure :/
+				body = body.write_to_bytes
+				len = body.length
+				# Keep the body as bytes since we have it
+				self.body = body
+			end
 
 			# Size of included files
 			for path in files do