Update app.py

app.py

@@ -4,10 +4,12 @@ from typing import Iterator
 import os
 from phoenix.otel import register
 
+PHOENIX_API_KEY=st.secrets['PHOENIX_API_KEY']
+os.environ["PHOENIX_CLIENT_HEADERS"] = f"api_key={PHOENIX_API_KEY}"
+
 tracer_provider = register(
   project_name=st.secrets['PHOENIX_PROJECT_NAME'],
   endpoint=os.getenv('PHOENIX_COLLECTOR_ENDPOINT'),
-  headers={"api_key": st.secrets["PHOENIX_CLIENT_HEADERS"]}
 )
 
 from openinference.instrumentation.openai import OpenAIInstrumentor