Add basic error message if URL fails to download

app.py

@@ -90,6 +90,7 @@ question_files = {
 
 
 def process_path(path):
+    error = None
     if path:
         try:
             document = load_document(path)
@@ -100,14 +101,16 @@ def process_path(path):
                 gr.update(visible=False, value=None),
                 gr.update(visible=False, value=None),
             )
-        except Exception:
+        except Exception as e:
             traceback.print_exc()
+            error = str(e)
     return (
         None,
         gr.update(visible=False, value=None),
         gr.update(visible=False),
         gr.update(visible=False, value=None),
         gr.update(visible=False, value=None),
+        gr.update(visible=True, value=error) if error is not None else None,
     )
 
 
@@ -121,6 +124,7 @@ def process_upload(file):
             gr.update(visible=False),
             gr.update(visible=False, value=None),
             gr.update(visible=False, value=None),
+            None,
         )
 
 
@@ -265,6 +269,10 @@ gradio-app h2, .gradio-app h2 {
     border-color: #777;
     font-size: 18px;
 }
+
+#url-error input {
+    color: red;
+}
 """
 
 with gr.Blocks(css=CSS) as demo:
@@ -290,14 +298,23 @@ with gr.Blocks(css=CSS) as demo:
                 )
             image = gr.Gallery(visible=False)
             with gr.Row(equal_height=True):
-                url = gr.Textbox(
-                    show_label=False,
-                    placeholder="URL",
-                    lines=1,
-                    max_lines=1,
-                    elem_id="url-textbox",
-                )
-                submit = gr.Button("Get")
+                with gr.Column():
+                    with gr.Row():
+                        url = gr.Textbox(
+                            show_label=False,
+                            placeholder="URL",
+                            lines=1,
+                            max_lines=1,
+                            elem_id="url-textbox",
+                        )
+                        submit = gr.Button("Get")
+                    url_error = gr.Textbox(
+                        visible=False,
+                        elem_id="url-error",
+                        max_lines=1,
+                        interactive=False,
+                        label="Error",
+                    )
             gr.Markdown("— or —")
             upload = gr.File(label=None, interactive=True, elem_id="short-upload-box")
             gr.Examples(
@@ -341,6 +358,7 @@ with gr.Blocks(css=CSS) as demo:
                 None,
                 None,
                 None,
+                gr.update(visible=False, value=None),
                 None,
             ),
             inputs=clear_button,
@@ -353,6 +371,7 @@ with gr.Blocks(css=CSS) as demo:
                 example_image,
                 upload,
                 url,
+                url_error,
                 question,
             ],
         )
@@ -360,12 +379,12 @@ with gr.Blocks(css=CSS) as demo:
     upload.change(
         fn=process_upload,
         inputs=[upload],
-        outputs=[document, image, img_clear_button, output, output_text],
+        outputs=[document, image, img_clear_button, output, output_text, url_error],
     )
     submit.click(
         fn=process_path,
         inputs=[url],
-        outputs=[document, image, img_clear_button, output, output_text],
+        outputs=[document, image, img_clear_button, output, output_text, url_error],
     )
 
     question.submit(