LiteLLM Minor Fixes & Improvements (10/24/2024) (#6421)

* fix(utils.py): support passing dynamic api base to validate_environment

Returns True if just api base is required and api base is passed

* fix(litellm_pre_call_utils.py): feature flag sending client headers to llm api

Fixes https://github.com/BerriAI/litellm/issues/6410

* fix(anthropic/chat/transformation.py): return correct error message

* fix(http_handler.py): add error response text in places where we expect it

* fix(factory.py): handle base case of no non-system messages to bedrock

Fixes https://github.com/BerriAI/litellm/issues/6411

* feat(cohere/embed): Support cohere image embeddings

Closes https://github.com/BerriAI/litellm/issues/6413

* fix(__init__.py): fix linting error

* docs(supported_embedding.md): add image embedding example to docs

* feat(cohere/embed): use cohere embedding returned usage for cost calc

* build(model_prices_and_context_window.json): add embed-english-v3.0 details (image cost + 'supports_image_input' flag)

* fix(cohere_transformation.py): fix linting error

* test(test_proxy_server.py): cleanup test

* test: cleanup test

* fix: fix linting errors

litellm/proxy/litellm_pre_call_utils.py

@@ -238,11 +238,15 @@ class LiteLLMProxyRequestSetup:
         - Adds org id
         """
         data = LitellmDataForBackendLLMCall()
-        _headers = LiteLLMProxyRequestSetup.add_headers_to_llm_call(
-            headers, user_api_key_dict
-        )
-        if _headers != {}:
-            data["headers"] = _headers
+        if (
+            general_settings
+            and general_settings.get("forward_client_headers_to_llm_api") is True
+        ):
+            _headers = LiteLLMProxyRequestSetup.add_headers_to_llm_call(
+                headers, user_api_key_dict
+            )
+            if _headers != {}:
+                data["headers"] = _headers
         _organization = LiteLLMProxyRequestSetup.get_openai_org_id_from_headers(
             headers, general_settings
         )