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API/HydrusNetwork.py

@@ -200,6 +200,10 @@ class HydrusNetwork:
                             content = spec.data
                         else:
                             json_data = spec.data
+                            # Hydrus expects JSON bodies to be sent with Content-Type: application/json.
+                            # httpx will usually set this automatically, but we set it explicitly to
+                            # match the Hydrus API docs and avoid edge cases.
+                            headers.setdefault("Content-Type", "application/json")
                         logger.debug(f"{self._log_prefix()} Request body size: {len(content) if content else 'json'}")
                     
                     response = client.request(