fix: allow empty provider secrets to attempt requests

apps/aether-gateway/src/ai_pipeline/planner/candidate_preparation.rs

@@ -82,3 +82,116 @@ pub(crate) async fn resolve_candidate_oauth_auth(
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use aether_provider_transport::snapshot::{
+        GatewayProviderTransportEndpoint, GatewayProviderTransportKey,
+        GatewayProviderTransportProvider, GatewayProviderTransportSnapshot,
+    };
+    use aether_scheduler_core::SchedulerMinimalCandidateSelectionCandidate;
+
+    use super::{prepare_header_authenticated_candidate, OauthPreparationContext};
+    use crate::ai_pipeline::PlannerAppState;
+
+    fn sample_transport() -> GatewayProviderTransportSnapshot {
+        GatewayProviderTransportSnapshot {
+            provider: GatewayProviderTransportProvider {
+                id: "provider-1".to_string(),
+                name: "provider".to_string(),
+                provider_type: "custom".to_string(),
+                website: None,
+                is_active: true,
+                keep_priority_on_conversion: false,
+                enable_format_conversion: false,
+                concurrent_limit: None,
+                max_retries: None,
+                proxy: None,
+                request_timeout_secs: None,
+                stream_first_byte_timeout_secs: None,
+                config: None,
+            },
+            endpoint: GatewayProviderTransportEndpoint {
+                id: "endpoint-1".to_string(),
+                provider_id: "provider-1".to_string(),
+                api_format: "openai:chat".to_string(),
+                api_family: Some("openai".to_string()),
+                endpoint_kind: Some("chat".to_string()),
+                is_active: true,
+                base_url: "https://example.test".to_string(),
+                header_rules: None,
+                body_rules: None,
+                max_retries: None,
+                custom_path: None,
+                config: None,
+                format_acceptance_config: None,
+                proxy: None,
+            },
+            key: GatewayProviderTransportKey {
+                id: "key-1".to_string(),
+                provider_id: "provider-1".to_string(),
+                name: "key".to_string(),
+                auth_type: "api_key".to_string(),
+                is_active: true,
+                api_formats: Some(vec!["openai:chat".to_string()]),
+                auth_type_by_format: None,
+                allowed_models: None,
+                capabilities: None,
+                rate_multipliers: None,
+                global_priority_by_format: None,
+                expires_at_unix_secs: None,
+                proxy: None,
+                fingerprint: None,
+                decrypted_api_key: String::new(),
+                decrypted_auth_config: None,
+            },
+        }
+    }
+
+    fn sample_candidate() -> SchedulerMinimalCandidateSelectionCandidate {
+        SchedulerMinimalCandidateSelectionCandidate {
+            provider_id: "provider-1".to_string(),
+            provider_name: "provider".to_string(),
+            provider_type: "custom".to_string(),
+            provider_priority: 1,
+            endpoint_id: "endpoint-1".to_string(),
+            endpoint_api_format: "openai:chat".to_string(),
+            key_id: "key-1".to_string(),
+            key_name: "key".to_string(),
+            key_auth_type: "api_key".to_string(),
+            key_internal_priority: 1,
+            key_global_priority_for_format: None,
+            key_capabilities: None,
+            model_id: "model-1".to_string(),
+            global_model_id: "global-model-1".to_string(),
+            global_model_name: "gpt-test".to_string(),
+            selected_provider_model_name: "gpt-test-upstream".to_string(),
+            mapping_matched_model: None,
+        }
+    }
+
+    #[tokio::test]
+    async fn header_auth_preparation_allows_empty_auth_value() {
+        let state = crate::AppState::new().expect("state should build");
+        let transport = sample_transport();
+        let candidate = sample_candidate();
+
+        let prepared = prepare_header_authenticated_candidate(
+            PlannerAppState::new(&state),
+            &transport,
+            &candidate,
+            Some(("authorization".to_string(), String::new())),
+            OauthPreparationContext {
+                trace_id: "trace-empty-auth",
+                api_format: "openai:chat",
+                operation: "test",
+            },
+        )
+        .await
+        .expect("empty auth value should still prepare the candidate");
+
+        assert_eq!(prepared.auth_header, "authorization");
+        assert_eq!(prepared.auth_value, "");
+        assert_eq!(prepared.mapped_model, "gpt-test-upstream");
+    }
+}

apps/aether-gateway/src/handlers/public/support/test_connection/route.rs

@@ -242,22 +242,23 @@ pub(super) async fn maybe_build_local_test_connection_route_response(
         return None;
     };
 
-    let mut provider_request_headers = BTreeMap::from([
-        ("content-type".to_string(), "application/json".to_string()),
-        (auth_header.clone(), auth_value.clone()),
-    ]);
+    let mut provider_request_headers =
+        BTreeMap::from([("content-type".to_string(), "application/json".to_string())]);
+    if !auth_header.trim().is_empty() && !auth_value.trim().is_empty() {
+        provider_request_headers.insert(auth_header.clone(), auth_value.clone());
+    }
     if uses_vertex_query_auth {
         provider_request_headers.remove("x-goog-api-key");
     }
-    let protected_headers = if uses_vertex_query_auth {
-        &["content-type"][..]
+    let protected_headers = if uses_vertex_query_auth || auth_value.trim().is_empty() {
+        vec!["content-type"]
     } else {
-        &[auth_header.as_str(), "content-type"][..]
+        vec![auth_header.as_str(), "content-type"]
     };
     if !crate::provider_transport::apply_local_header_rules(
         &mut provider_request_headers,
         transport.endpoint.header_rules.as_ref(),
-        protected_headers,
+        &protected_headers,
         &provider_request_body,
         None,
     ) {