Warn the first time a request is missing SCRIPT_PATH

src/types/request.rs

@@ -67,6 +67,21 @@ impl Request {
                 .cloned()
         );
 
+        // Send out a warning if the server did not specify a SCRIPT_PATH.
+        // This should only be done once to avoid spaming log files
+        #[cfg(feature = "scgi_srv")]
+        if script_path.is_none() {
+            static WARN: std::sync::Once = std::sync::Once::new();
+            WARN.call_once(||
+                warn!(concat!(
+                    "The SCGI server did not send a SCRIPT_PATH, indicating that it",
+                    " doesn't comply with Gemini's SCGI spec.  This will cause a problem",
+                    " if the app needs to rewrite a URL.  Please consult the proxy server",
+                    " to identify why this is."
+                ))
+            )
+        }
+
         uri.normalize();
 
         let input = match uri.query().filter(|q| !q.is_empty()) {