Update examples (#239)

* Additional example updates -- remove configurable key (no longer
required)
* Use pydantic v1 compatibility layer correctly

examples/configurable_chain/server.py

@@ -59,9 +59,7 @@
 )
 chain = prompt | model | StrOutputParser()
 
-# Add routes requires you to specify which config keys are accepted
-# specifically, you must accept `configurable` as a config key.
-add_routes(app, chain, path="/configurable_temp", config_keys=["configurable"])
+add_routes(app, chain, path="/configurable_temp")
 
 
 ###############################################################################
@@ -96,7 +94,6 @@ def fetch_api_key_from_header(config: Dict[str, Any], req: Request) -> Dict[str,
     app,
     dynamic_auth_chain,
     path="/auth_from_header",
-    config_keys=["configurable"],
     per_req_config_modifier=fetch_api_key_from_header,
 )
 

examples/conversational_retrieval_chain/server.py

@@ -21,9 +21,9 @@
 from langchain.schema.output_parser import StrOutputParser
 from langchain.schema.runnable import RunnableMap, RunnablePassthrough
 from langchain.vectorstores import FAISS
-from pydantic.v1 import BaseModel, Field
 
 from langserve import add_routes
+from langserve.pydantic_v1 import BaseModel, Field
 
 _TEMPLATE = """Given the following conversation and a follow up question, rephrase the 
 follow up question to be a standalone question, in its original language.