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/llms/anthropic/chat/handler.py

@@ -398,6 +398,8 @@ class AnthropicChatCompletion(BaseLLM):
             error_response = getattr(e, "response", None)
             if error_headers is None and error_response:
                 error_headers = getattr(error_response, "headers", None)
+            if error_response and hasattr(error_response, "text"):
+                error_text = getattr(error_response, "text", error_text)
             raise AnthropicError(
                 message=error_text,
                 status_code=status_code,