diff --git a/src/lib.rs b/src/lib.rs
index 7f2dd10..b61acbf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -390,6 +390,7 @@ impl ServerInner {
             request.set_cert(client_cert);
         }
 
+        #[cfg_attr(feature = "gemini_srv", allow(unused_mut))] // Used for scgi_srv only
         let mut response = if let Some((trailing, handler)) = self.routes.match_request(&request) {
             request.set_trailing(trailing);
             handler.handle(request.clone()).await
@@ -397,12 +398,25 @@ impl ServerInner {
             Response::not_found()
         };
 
-        match response.rewrite_all(&request).await {
-            Ok(true) => { /* all is well */ }
-            Ok(false) => panic!("Upstream did not include SCRIPT_PATH or SCRIPT_NAME"),
-            Err(e) => {
-                error!("Error reading text/gemini file from Response reader: {}", e);
-                response = Response::not_found();
+        #[cfg(feature = "scgi_srv")] // No point running noop code
+        if self.autorewrite {
+            match response.rewrite_all(&request).await {
+                Ok(true) => { /* all is well */ }
+                Ok(false) => {
+                    error!(
+                        concat!(
+                        "Upstream did not include SCRIPT_PATH or SCRIPT_NAME, refusing to",
+                        " serve any text/gemini content with absolute links.  It's most",
+                        " likely that the proxy server you're using doesn't correctly",
+                        " or completely implement the SCGI specification.",
+                        )
+                    );
+                    response = Response::temporary_failure("Server misconfigured");
+                },
+                Err(e) => {
+                    error!("Error reading text/gemini file from Response reader: {}", e);
+                    response = Response::not_found();
+                }
             }
         }