Avoid XML errors

1 files changed, 8 insertions, 6 deletions

diff --git a/libs/web/luasrc/http.lua b/libs/web/luasrc/http.lua
index 6b73b9414c..c5a85ea4d9 100644
--- a/libs/web/luasrc/http.lua
+++ b/libs/web/luasrc/http.lua
@@ -192,14 +192,16 @@ end
 --- Set the mime type of following content data.
 -- @param mime	Mimetype of following content
 function prepare_content(mime)
-	if mime == "application/xhtml+xml" then
-		if not getenv("HTTP_ACCEPT") or
-		  not getenv("HTTP_ACCEPT"):find("application/xhtml+xml", nil, true) then
-			mime = "text/html; charset=UTF-8"
+	if not context.headers or not context.headers["content-type"] then
+		if mime == "application/xhtml+xml" then
+			if not getenv("HTTP_ACCEPT") or
+			  not getenv("HTTP_ACCEPT"):find("application/xhtml+xml", nil, true) then
+				mime = "text/html; charset=UTF-8"
+			end
+			header("Vary", "Accept")
 		end
-		header("Vary", "Accept")
+		header("Content-Type", mime)
 	end
-	header("Content-Type", mime)
 end
 
 --- Get the RAW HTTP input source