add support for promptflow endpoint (#709)

.env.sample

@@ -100,4 +100,11 @@ AZURE_MLINDEX_FILENAME_COLUMN=
 AZURE_MLINDEX_TITLE_COLUMN= 
 AZURE_MLINDEX_URL_COLUMN= 
 AZURE_MLINDEX_VECTOR_COLUMNS=
-AZURE_MLINDEX_QUERY_TYPE=
+AZURE_MLINDEX_QUERY_TYPE=
+# Chat with data: Prompt flow API
+USE_PROMPTFLOW=False
+PROMPTFLOW_ENDPOINT=
+PROMPTFLOW_API_KEY=
+PROMPTFLOW_RESPONSE_TIMEOUT=120
+PROMPTFLOW_REQUEST_FIELD_NAME=question
+PROMPTFLOW_RESPONSE_FIELD_NAME=answer

README.md

@@ -230,6 +230,12 @@ Note: settings starting with `AZURE_SEARCH` are only needed when using Azure Ope
 |UI_FAVICON|| Defaults to Contoso favicon. Configure the URL to your favicon to modify.
 |UI_SHOW_SHARE_BUTTON|True|Share button (right-top)
 |SANITIZE_ANSWER|False|Whether to sanitize the answer from Azure OpenAI. Set to True to remove any HTML tags from the response.|
+|USE_PROMPTFLOW|False|Use existing Promptflow deployed endpoint. If set to `True` then both `PROMPTFLOW_ENDPOINT` and `PROMPTFLOW_API_KEY` also need to be set.|
+|PROMPTFLOW_ENDPOINT||URL of the deployed Promptflow endpoint e.g. https://pf-deployment-name.region.inference.ml.azure.com/score|
+|PROMPTFLOW_API_KEY||Auth key for deployed Promptflow endpoint. Note: only Key-based authentication is supported.|
+|PROMPTFLOW_RESPONSE_TIMEOUT|120|Timeout value in seconds for the Promptflow endpoint to respond.|
+|PROMPTFLOW_REQUEST_FIELD_NAME|question|Default field name to construct Promptflow request. Note: chat_history is auto constucted based on the interaction, if your API expects other mandatory field you will need to change the request parameters under `promptflow_request` function.|
+|PROMPTFLOW_RESPONSE_FIELD_NAME|answer|Default field name to process the response from Promptflow request.|
 
 ## Contributing