From 65da5018f68ffed978056a2cde75a3981dacaad5 Mon Sep 17 00:00:00 2001
From: Davy Landman <davy.landman@swat.engineering>
Date: Wed, 17 Jun 2026 16:49:21 +0200
Subject: [PATCH] Only return external output resolver if the input resolver
 also goes to the external

---
 src/org/rascalmpl/uri/URIResolverRegistry.java | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/org/rascalmpl/uri/URIResolverRegistry.java b/src/org/rascalmpl/uri/URIResolverRegistry.java
index ed7943766e..74ed2be442 100644
--- a/src/org/rascalmpl/uri/URIResolverRegistry.java
+++ b/src/org/rascalmpl/uri/URIResolverRegistry.java
@@ -506,7 +506,11 @@ private ISourceLocationOutput getOutputResolver(String scheme) {
 					return result;
 				}
 			}
-			if (externalRegistry != null && externalRegistry.supportsOutput(scheme)) {
+			// only return an external registry if the input is also going to an external resolver
+			// as input resolvers are quite common, but output less, and we don't want all of them
+			// to always go via the external registries (just to receive an exception)
+			var inputResolver = getInputResolver(scheme);
+			if (externalRegistry != null && externalRegistry.supportsOutput(scheme) && inputResolver == externalRegistry) {
 				return externalRegistry;
 			}
 		}