fix: enforce provider upstream stream policy

apps/aether-gateway/src/ai_serving/planner/standard/normalize/chat.rs

@@ -9,10 +9,13 @@ use crate::ai_serving::{
     GatewayProviderTransportSnapshot,
 };
 
+use super::{enforce_provider_body_stream_policy, request_requires_body_stream_field};
+
 pub(crate) fn build_local_openai_chat_request_body(
     body_json: &Value,
     mapped_model: &str,
     upstream_is_stream: bool,
+    force_body_stream_field: bool,
     body_rules: Option<&Value>,
     request_headers: &http::HeaderMap,
     enable_model_directives: bool,
@@ -23,12 +26,20 @@ pub(crate) fn build_local_openai_chat_request_body(
         upstream_is_stream,
         enable_model_directives,
     )?;
-    apply_standard_provider_request_body_rules_with_request_headers(
-        provider_request_body,
-        body_rules,
-        body_json,
-        request_headers,
-    )
+    let mut provider_request_body =
+        apply_standard_provider_request_body_rules_with_request_headers(
+            provider_request_body,
+            body_rules,
+            body_json,
+            request_headers,
+        )?;
+    enforce_provider_body_stream_policy(
+        &mut provider_request_body,
+        "openai:chat",
+        upstream_is_stream,
+        request_requires_body_stream_field(body_json, force_body_stream_field),
+    );
+    Some(provider_request_body)
 }
 
 pub(crate) fn build_local_openai_chat_upstream_url(
@@ -44,6 +55,7 @@ pub(crate) fn build_cross_format_openai_chat_request_body(
     provider_type: &str,
     provider_api_format: &str,
     upstream_is_stream: bool,
+    force_body_stream_field: bool,
     body_rules: Option<&Value>,
     user_api_key_id: Option<&str>,
     request_headers: &http::HeaderMap,
@@ -74,6 +86,12 @@ pub(crate) fn build_cross_format_openai_chat_request_body(
         &mut provider_request_body,
         provider_api_format,
     );
+    enforce_provider_body_stream_policy(
+        &mut provider_request_body,
+        provider_api_format,
+        upstream_is_stream,
+        request_requires_body_stream_field(body_json, force_body_stream_field),
+    );
     Some(provider_request_body)
 }
 

apps/aether-gateway/src/ai_serving/planner/standard/normalize/responses.rs

@@ -9,10 +9,13 @@ use crate::ai_serving::{
     GatewayProviderTransportSnapshot,
 };
 
+use super::{enforce_provider_body_stream_policy, request_requires_body_stream_field};
+
 pub(crate) fn build_local_openai_responses_request_body(
     body_json: &Value,
     mapped_model: &str,
     require_streaming: bool,
+    force_body_stream_field: bool,
     provider_type: &str,
     provider_api_format: &str,
     body_rules: Option<&Value>,
@@ -44,6 +47,12 @@ pub(crate) fn build_local_openai_responses_request_body(
         &mut provider_request_body,
         provider_api_format,
     );
+    enforce_provider_body_stream_policy(
+        &mut provider_request_body,
+        provider_api_format,
+        require_streaming,
+        request_requires_body_stream_field(body_json, force_body_stream_field),
+    );
     Some(provider_request_body)
 }
 
@@ -53,6 +62,7 @@ pub(crate) fn build_cross_format_openai_responses_request_body(
     client_api_format: &str,
     provider_api_format: &str,
     upstream_is_stream: bool,
+    force_body_stream_field: bool,
     provider_type: &str,
     body_rules: Option<&Value>,
     user_api_key_id: Option<&str>,
@@ -85,6 +95,12 @@ pub(crate) fn build_cross_format_openai_responses_request_body(
         &mut provider_request_body,
         provider_api_format,
     );
+    enforce_provider_body_stream_policy(
+        &mut provider_request_body,
+        provider_api_format,
+        upstream_is_stream,
+        request_requires_body_stream_field(body_json, force_body_stream_field),
+    );
     Some(provider_request_body)
 }
 

apps/aether-gateway/src/ai_serving/planner/standard/normalize/tests.rs

@@ -87,6 +87,7 @@ fn builds_openai_chat_cross_format_request_body_from_openai_responses_source() {
         "openai:responses",
         "openai:chat",
         false,
+        false,
         "openai",
         None,
         None,
@@ -121,6 +122,7 @@ fn local_openai_responses_wrapper_preserves_body_order_after_edits() {
         &body_json,
         "gpt-5.4",
         true,
+        false,
         "codex",
         "openai:responses",
         None,
@@ -160,6 +162,7 @@ fn local_openai_responses_compact_wrapper_strips_store_for_same_format_requests(
         &body_json,
         "gpt-5.4",
         false,
+        false,
         "openai",
         "openai:responses:compact",
         None,
@@ -170,6 +173,7 @@ fn local_openai_responses_compact_wrapper_strips_store_for_same_format_requests(
     .expect("local openai compact body should build");
 
     assert!(provider_request_body.get("store").is_none());
+    assert!(provider_request_body.get("stream").is_none());
 }
 
 #[test]
@@ -187,6 +191,7 @@ fn local_openai_responses_wrapper_applies_model_directive_before_body_rules() {
         &body_json,
         "gpt-5.4",
         false,
+        false,
         "openai",
         "openai:responses",
         Some(&body_rules),
@@ -237,6 +242,7 @@ fn strips_metadata_for_codex_openai_responses_requests() {
         "claude:messages",
         "openai:responses",
         true,
+        false,
         "codex",
         None,
         None,
@@ -271,6 +277,7 @@ fn applies_codex_defaults_unless_body_rules_handle_the_field() {
         "claude:messages",
         "openai:responses",
         true,
+        false,
         "codex",
         Some(&body_rules),
         None,
@@ -300,6 +307,7 @@ fn injects_codex_prompt_cache_key_for_openai_responses_cross_format_requests() {
         "claude:messages",
         "openai:responses",
         true,
+        false,
         "codex",
         None,
         Some("key-123"),
@@ -330,6 +338,7 @@ fn injects_codex_prompt_cache_key_for_openai_chat_cross_format_requests() {
         "codex",
         "openai:responses",
         false,
+        false,
         None,
         Some("key-123"),
         &http::HeaderMap::new(),