Litellm dev 01 22 2025 p4 (#7932)

* feat(main.py): add new 'provider_specific_header' param

allows passing extra header for specific provider

* fix(litellm_pre_call_utils.py): add unit test for pre call utils

* test(test_bedrock_completion.py): skip test now that bedrock supports this

litellm/proxy/litellm_pre_call_utils.py

@@ -20,6 +20,7 @@ from litellm.proxy._types import (
 from litellm.types.llms.anthropic import ANTHROPIC_API_HEADERS
 from litellm.types.services import ServiceTypes
 from litellm.types.utils import (
+    ProviderSpecificHeader,
     StandardLoggingUserAPIKeyMetadata,
     SupportedCacheControls,
 )
@@ -729,19 +730,20 @@ def add_provider_specific_headers_to_request(
     data: dict,
     headers: dict,
 ):
-
-    extra_headers = data.get("extra_headers", {}) or {}
-
+    anthropic_headers = {}
     # boolean to indicate if a header was added
     added_header = False
     for header in ANTHROPIC_API_HEADERS:
         if header in headers:
             header_value = headers[header]
-            extra_headers.update({header: header_value})
+            anthropic_headers[header] = header_value
             added_header = True
 
     if added_header is True:
-        data["extra_headers"] = extra_headers
+        data["provider_specific_header"] = ProviderSpecificHeader(
+            custom_llm_provider="anthropic",
+            extra_headers=anthropic_headers,
+        )
 
     return