More debug info when try_from_http_request fails

src/api/ruma_wrapper/axum.rs

@@ -281,7 +281,10 @@ where
         debug!("{:?}", http_request);
 
         let body = T::try_from_http_request(http_request, &path_params).map_err(|e| {
-            warn!("{:?}\n{:?}", e, json_body);
+            warn!(
+                "try_from_http_request failed: {:?}\nJSON body: {:?}",
+                e, json_body
+            );
             Error::BadRequest(ErrorKind::BadJson, "Failed to deserialize request.")
         })?;