Merge branch 'master' into plugins-2

app/post.go

@@ -782,6 +782,11 @@ func (a *App) GetOpenGraphMetadata(requestURL string) *opengraph.OpenGraph {
 
 	makeOpenGraphURLsAbsolute(og, requestURL)
 
+	// The URL should be the link the user provided in their message, not a redirected one.
+	if og.URL != "" {
+		og.URL = requestURL
+	}
+
 	return og
 }