Refactor platform headers; rename captured-headers metadata key

Platform settings now build auth/routing headers using the shared
constants in uipath.platform.common.constants (lowercase canonical
form; HTTP is case-insensitive so no wire change). Process key is
URL-encoded (quote(..., safe="")) before being sent, matching the
platform-wide convention, and licensing_context is read dynamically
from UiPathConfig at call time so updates are picked up without
rebuilding settings.

Langchain: captured gateway headers are now exposed on
AIMessage.response_metadata under the "headers" key (previously
"uipath_llmgateway_headers"). Breaking for anyone reading that key.

Core 1.9.1 -> 1.9.2. Langchain 1.9.1 -> 1.9.2 (requires core >= 1.9.2).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: cosminacho

CHANGELOG.md

@@ -2,6 +2,15 @@
 
 All notable changes to `uipath_llm_client` (core package) will be documented in this file.
 
+## [1.9.2] - 2026-04-17
+
+### Changed
+- `PlatformBaseSettings.build_auth_headers()` now uses the header-name constants from `uipath.platform.common.constants` (lowercase canonical form). HTTP header names are case-insensitive so wire-level behavior is unchanged.
+- `UIPATH_PROCESS_KEY` is now URL-encoded (`urllib.parse.quote(..., safe="")`) before being placed in `X-UiPath-ProcessKey`, matching the platform-wide convention.
+
+### Added
+- `HEADER_LICENSING_CONTEXT` header populated dynamically from `UiPathConfig.licensing_context` when set.
+
 ## [1.9.1] - 2026-04-17
 
 ### Added

packages/uipath_langchain_client/CHANGELOG.md

@@ -2,6 +2,12 @@
 
 All notable changes to `uipath_langchain_client` will be documented in this file.
 
+## [1.9.2] - 2026-04-17
+
+### Changed
+- **Breaking:** captured gateway headers are now exposed on `AIMessage.response_metadata` under the `headers` key (previously `uipath_llmgateway_headers`). Update any consumers that read this key.
+- Minimum `uipath-llm-client` bumped to 1.9.2 for the platform-headers refactor and licensing-context support.
+
 ## [1.9.1] - 2026-04-17
 
 ### Fixed

packages/uipath_langchain_client/pyproject.toml

@@ -6,7 +6,7 @@ readme = "README.md"
 requires-python = ">=3.11"
 dependencies = [
     "langchain>=1.2.15",
-    "uipath-llm-client>=1.9.1",
+    "uipath-llm-client>=1.9.2",
 ]
 
 [project.optional-dependencies]

packages/uipath_langchain_client/src/uipath_langchain_client/__version__.py

@@ -1,3 +1,3 @@
 __title__ = "UiPath LangChain Client"
 __description__ = "A Python client for interacting with UiPath's LLM services via LangChain."
-__version__ = "1.9.1"
+__version__ = "1.9.2"

packages/uipath_langchain_client/src/uipath_langchain_client/base_client.py

@@ -115,7 +115,7 @@ class UiPathBaseLLMClient(BaseModel, ABC):
     captured_headers: tuple[str, ...] = Field(
         default=("x-uipath-",),
         description="Case-insensitive response header prefixes to capture from LLM Gateway responses. "
-        "Captured headers appear in response_metadata under the 'uipath_llmgateway_headers' key. "
+        "Captured headers appear in response_metadata under the 'headers' key. "
         "Set to an empty tuple to disable.",
     )
 
@@ -343,7 +343,7 @@ class UiPathBaseChatModel(UiPathBaseLLMClient, BaseChatModel):
 
     Wraps _generate/_agenerate/_stream/_astream to automatically read captured headers
     from the ContextVar (populated by the httpx client's send()) and inject them into
-    the AIMessage's response_metadata under the 'uipath_llmgateway_headers' key.
+    the AIMessage's response_metadata under the 'headers' key.
 
     Dynamic request headers are injected via UiPathDynamicHeadersCallback: set
     ``run_inline = True`` (already the default) so LangChain calls
@@ -475,7 +475,7 @@ def _inject_gateway_headers(self, generations: Sequence[ChatGeneration]) -> None
         if not headers:
             return
         for generation in generations:
-            generation.message.response_metadata["uipath_llmgateway_headers"] = headers
+            generation.message.response_metadata["headers"] = headers
 
 
 class UiPathBaseEmbeddings(UiPathBaseLLMClient, Embeddings):

src/uipath/llm_client/__version__.py

@@ -1,3 +1,3 @@
 __title__ = "UiPath LLM Client"
 __description__ = "A Python client for interacting with UiPath's LLM services."
-__version__ = "1.9.1"
+__version__ = "1.9.2"

src/uipath/llm_client/settings/platform/settings.py

@@ -2,11 +2,23 @@
 
 from collections.abc import Mapping
 from typing import Any, Self
+from urllib.parse import quote
 
 from pydantic import Field, SecretStr, model_validator
 from typing_extensions import override
 from uipath.platform import UiPath
 from uipath.platform.common import EndpointManager
+from uipath.platform.common._config import UiPathConfig
+from uipath.platform.common.constants import (
+    HEADER_AGENTHUB_CONFIG,
+    HEADER_FOLDER_KEY,
+    HEADER_INTERNAL_ACCOUNT_ID,
+    HEADER_INTERNAL_TENANT_ID,
+    HEADER_JOB_KEY,
+    HEADER_LICENSING_CONTEXT,
+    HEADER_PROCESS_KEY,
+    HEADER_TRACE_ID,
+)
 
 from uipath.llm_client.settings.base import UiPathAPIConfig, UiPathBaseSettings
 from uipath.llm_client.settings.constants import ApiType, RoutingMode
@@ -134,21 +146,31 @@ def build_auth_headers(
         model_name: str | None = None,
         api_config: UiPathAPIConfig | None = None,
     ) -> Mapping[str, str]:
-        """Build authentication and routing headers for API requests."""
+        """Build authentication and routing headers for API requests.
+
+        Mirrors the platform-wide header convention (see
+        ``uipath.platform.common.constants``): routing headers come from the
+        configured org/tenant, tracing headers come from pydantic fields
+        (which pull from env vars), and licensing context is read dynamically
+        from ``UiPathConfig`` at call time so updates are picked up without
+        rebuilding settings.
+        """
         headers: dict[str, str] = {
-            "X-UiPath-Internal-AccountId": self.organization_id,
-            "X-UiPath-Internal-TenantId": self.tenant_id,
+            HEADER_INTERNAL_ACCOUNT_ID: self.organization_id,
+            HEADER_INTERNAL_TENANT_ID: self.tenant_id,
         }
         if self.agenthub_config:
-            headers["X-UiPath-AgentHub-Config"] = self.agenthub_config
+            headers[HEADER_AGENTHUB_CONFIG] = self.agenthub_config
         if self.process_key:
-            headers["X-UiPath-ProcessKey"] = self.process_key
+            headers[HEADER_PROCESS_KEY] = quote(self.process_key, safe="")
         if self.folder_key:
-            headers["X-UiPath-FolderKey"] = self.folder_key
+            headers[HEADER_FOLDER_KEY] = self.folder_key
         if self.job_key:
-            headers["X-UiPath-JobKey"] = self.job_key
+            headers[HEADER_JOB_KEY] = self.job_key
         if self.trace_id:
-            headers["X-UiPath-TraceId"] = self.trace_id
+            headers[HEADER_TRACE_ID] = self.trace_id
+        if licensing_context := UiPathConfig.licensing_context:
+            headers[HEADER_LICENSING_CONTEXT] = licensing_context
         return headers
 
     @override

tests/core/features/settings/test_platform.py

@@ -63,9 +63,9 @@ def test_build_auth_headers_has_default_config(self, platform_env_vars, mock_pla
             settings = PlatformSettings()
             headers = settings.build_auth_headers()
             assert headers == {
-                "X-UiPath-Internal-AccountId": "test-org-id",
-                "X-UiPath-Internal-TenantId": "test-tenant-id",
-                "X-UiPath-AgentHub-Config": "agentsruntime",
+                "x-uipath-internal-accountid": "test-org-id",
+                "x-uipath-internal-tenantid": "test-tenant-id",
+                "x-uipath-agenthub-config": "agentsruntime",
             }
 
     def test_build_auth_headers_with_tracing(self, platform_env_vars, mock_platform_auth):
@@ -79,9 +79,22 @@ def test_build_auth_headers_with_tracing(self, platform_env_vars, mock_platform_
         with patch.dict(os.environ, env, clear=True):
             settings = PlatformSettings()
             headers = settings.build_auth_headers()
-            assert headers["X-UiPath-AgentHub-Config"] == "test-config"
-            assert headers["X-UiPath-ProcessKey"] == "test-process"
-            assert headers["X-UiPath-JobKey"] == "test-job"
+            assert headers["x-uipath-agenthub-config"] == "test-config"
+            assert headers["x-uipath-processkey"] == "test-process"
+            assert headers["x-uipath-jobkey"] == "test-job"
+
+    def test_build_auth_headers_process_key_is_url_encoded(
+        self, platform_env_vars, mock_platform_auth
+    ):
+        """Process key must be URL-encoded for safe transport in headers."""
+        env = {
+            **platform_env_vars,
+            "UIPATH_PROCESS_KEY": "path/with+special=chars",
+        }
+        with patch.dict(os.environ, env, clear=True):
+            settings = PlatformSettings()
+            headers = settings.build_auth_headers()
+            assert headers["x-uipath-processkey"] == "path%2Fwith%2Bspecial%3Dchars"
 
     def test_build_auth_pipeline_returns_auth(self, platform_env_vars, mock_platform_auth):
         """Test build_auth_pipeline returns an Auth instance."""
@@ -199,8 +212,8 @@ def test_build_auth_headers_only_required_when_no_optional(
             settings.job_key = None
             headers = settings.build_auth_headers()
             assert headers == {
-                "X-UiPath-Internal-AccountId": "test-org-id",
-                "X-UiPath-Internal-TenantId": "test-tenant-id",
+                "x-uipath-internal-accountid": "test-org-id",
+                "x-uipath-internal-tenantid": "test-tenant-id",
             }
 
     def test_validation_requires_all_fields(self, mock_platform_auth):

tests/langchain/features/test_captured_headers.py

@@ -329,8 +329,8 @@ class TestNormalizedClientHeaderCapture:
     def test_generate_captures_headers(self, llmgw_settings):
         chat = _make_normalized_chat(llmgw_settings)
         result = chat.invoke("Hello")
-        assert "uipath_llmgateway_headers" in result.response_metadata
-        gateway_headers = result.response_metadata["uipath_llmgateway_headers"]
+        assert "headers" in result.response_metadata
+        gateway_headers = result.response_metadata["headers"]
         assert "x-uipath-requestid" in gateway_headers
         assert "x-uipath-traceid" in gateway_headers
         assert "content-type" not in gateway_headers
@@ -339,8 +339,8 @@ def test_generate_captures_headers(self, llmgw_settings):
     async def test_agenerate_captures_headers(self, llmgw_settings):
         chat = _make_normalized_chat(llmgw_settings)
         result = await chat.ainvoke("Hello")
-        assert "uipath_llmgateway_headers" in result.response_metadata
-        gateway_headers = result.response_metadata["uipath_llmgateway_headers"]
+        assert "headers" in result.response_metadata
+        gateway_headers = result.response_metadata["headers"]
         assert "x-uipath-requestid" in gateway_headers
 
     def test_stream_captures_headers_on_first_chunk(self, llmgw_settings):
@@ -349,12 +349,12 @@ def test_stream_captures_headers_on_first_chunk(self, llmgw_settings):
         assert len(chunks) >= 1
         # First chunk should have gateway headers
         first_chunk = chunks[0]
-        assert "uipath_llmgateway_headers" in first_chunk.response_metadata
-        gateway_headers = first_chunk.response_metadata["uipath_llmgateway_headers"]
+        assert "headers" in first_chunk.response_metadata
+        gateway_headers = first_chunk.response_metadata["headers"]
         assert "x-uipath-requestid" in gateway_headers
         # Later chunks should not have gateway headers
         if len(chunks) > 1:
-            assert "uipath_llmgateway_headers" not in chunks[1].response_metadata
+            assert "headers" not in chunks[1].response_metadata
 
     @pytest.mark.asyncio
     async def test_astream_captures_headers_on_first_chunk(self, llmgw_settings):
@@ -364,22 +364,22 @@ async def test_astream_captures_headers_on_first_chunk(self, llmgw_settings):
             chunks.append(chunk)
         assert len(chunks) >= 1
         first_chunk = chunks[0]
-        assert "uipath_llmgateway_headers" in first_chunk.response_metadata
+        assert "headers" in first_chunk.response_metadata
 
     def test_custom_prefixes(self, llmgw_settings):
         chat = _make_normalized_chat(
             llmgw_settings,
             captured_headers=("x-uipath-", "x-ratelimit-"),
         )
         result = chat.invoke("Hello")
-        gateway_headers = result.response_metadata["uipath_llmgateway_headers"]
+        gateway_headers = result.response_metadata["headers"]
         assert "x-uipath-requestid" in gateway_headers
         assert "x-ratelimit-remaining" in gateway_headers
 
     def test_disabled_capture(self, llmgw_settings):
         chat = _make_normalized_chat(llmgw_settings, captured_headers=())
         result = chat.invoke("Hello")
-        assert "uipath_llmgateway_headers" not in result.response_metadata
+        assert "headers" not in result.response_metadata
 
     def test_no_matching_headers(self, llmgw_settings):
         chat = _make_normalized_chat(
@@ -388,7 +388,7 @@ def test_no_matching_headers(self, llmgw_settings):
         )
         result = chat.invoke("Hello")
         # No matching headers, so the key should not be present
-        assert "uipath_llmgateway_headers" not in result.response_metadata
+        assert "headers" not in result.response_metadata
 
 
 # ============================================================================
@@ -417,7 +417,7 @@ def test_inject_gateway_headers_populates_result(self, llmgw_settings):
             generations=[ChatGeneration(message=AIMessage(content="test", response_metadata={}))]
         )
         chat._inject_gateway_headers(result.generations)
-        assert result.generations[0].message.response_metadata["uipath_llmgateway_headers"] == {
+        assert result.generations[0].message.response_metadata["headers"] == {
             "x-uipath-requestid": "test-123"
         }
         set_captured_response_headers({})
@@ -434,5 +434,5 @@ def test_inject_gateway_headers_skipped_when_disabled(self, llmgw_settings):
             generations=[ChatGeneration(message=AIMessage(content="test", response_metadata={}))]
         )
         chat._inject_gateway_headers(result.generations)
-        assert "uipath_llmgateway_headers" not in result.generations[0].message.response_metadata
+        assert "headers" not in result.generations[0].message.response_metadata
         set_captured_response_headers({})