support proxy openai urls

litellm/tests/test_proxy_api.py

@@ -0,0 +1,15 @@
+import sys, os
+import traceback
+sys.path.insert(0, os.path.abspath('../..'))  # Adds the parent directory to the system path
+import litellm
+from litellm import embedding, completion
+
+litellm.api_base = "https://oai.hconeai.com/v1"
+litellm.headers = {"Helicone-Auth": f"Bearer {os.getenv('HELICONE_API_KEY')}"}
+
+response = litellm.completion(
+    model="gpt-3.5-turbo",
+    messages=[{"role": "user", "content": "how does a court case get to the Supreme Court?"}]
+)
+
+print(response)