Update app.py

app.py

@@ -17,7 +17,18 @@ DESCRIPTION = """
 Built with 🤗 Hugging Face's [transformers](https://huggingface.co/transformers/) library, [SentenceBert](https://www.sbert.net/) models, [Streamlit](https://streamlit.io/) and 44k movie descriptions from the Kaggle [Movies Dataset](https://www.kaggle.com/rounakbanik/the-movies-dataset)
 """
 
-
+try:
+    query_params = st.experimental_get_query_params()
+    query_option = query_params['option'][0] #throws an exception when visiting http://host:port
+    option_selected = st.sidebar.selectbox('Pick option', options, index=options.index(query_option))
+    if option_selected:
+        st.experimental_set_query_params(option=option_selected)
+except: # catch exception and set query param to predefined value
+    st.experimental_set_query_params(option="Genomics") # defaults to dog
+    query_params = st.experimental_get_query_params()
+    query_option = query_params['option'][0]
+    if option_selected:
+        st.experimental_set_query_params(option=option_selected)
 
 #def form_callback():
 #    st.write(st.session_state.my_slider)