Enhanced file upload debugging and XSRF configuration

- Added --server.enableXsrfProtection=false to Dockerfile ENTRYPOINT
- Enhanced file upload debugging with detailed logging
- Added file pointer reset for proper file reading
- Added UTF-8 decoding with error handling
- Added Streamlit version display in sidebar
- Fixed page_config order (must be first Streamlit command)
- Added empty file detection and better error messages

Dockerfile

@@ -19,4 +19,4 @@ EXPOSE 8501
 
 HEALTHCHECK CMD curl --fail http://localhost:8501/_stcore/health
 
-ENTRYPOINT ["streamlit", "run", "src/streamlit_app.py", "--server.port=8501", "--server.address=0.0.0.0", "--server.maxUploadSize=1024"]
+ENTRYPOINT ["streamlit", "run", "src/streamlit_app.py", "--server.port=8501", "--server.address=0.0.0.0", "--server.maxUploadSize=1024", "--server.enableXsrfProtection=false"]

src/streamlit_app.py

@@ -9,14 +9,20 @@ import json
 from pathlib import Path
 from typing import Dict, Any
 import io
+import sys
 
-# Page configuration
+# Page configuration (MUST be first Streamlit command)
 st.set_page_config(
     page_title="Field Correlation Analyzer",
     page_icon="🤖",
     layout="wide"
 )
 
+# Debug: Show Streamlit version and environment info
+with st.sidebar:
+    st.info(f"🐍 Python {sys.version}")
+    st.info(f"📦 Streamlit {st.__version__}")
+
 # Import our modules
 try:
     from structure_analysis import (
@@ -178,6 +184,10 @@ def main():
         help="Upload a JSON file with structured data (Maximum file size: 1 GB)"
     )
     
+    # Debug upload widget state
+    if uploaded_file is None:
+        st.info("📝 Waiting for file upload...")
+    
     if uploaded_file is not None:
         # Debug file upload info
         st.info(f"📁 File uploaded: {uploaded_file.name} (Size: {uploaded_file.size} bytes)")
@@ -187,15 +197,31 @@ def main():
         # Read and parse JSON
         try:
             st.info("🔄 Reading file content...")
+            
+            # Reset file pointer in case it was read before
+            uploaded_file.seek(0)
+            
+            # Read the file content
             content = uploaded_file.read()
+            uploaded_file.seek(0)  # Reset for potential re-reading
+            
             st.info(f"📄 Content length: {len(content)} characters")
             
             if len(content) == 0:
                 st.error("❌ File appears to be empty!")
+                st.warning("This might be a bug. Please try uploading the file again.")
+                return
+            
+            # Try to decode as UTF-8
+            try:
+                content_str = content.decode('utf-8')
+            except UnicodeDecodeError as e:
+                st.error(f"❌ File encoding error: {e}")
+                st.error("Please ensure your JSON file is UTF-8 encoded")
                 return
             
             st.info("🔄 Parsing JSON...")
-            data = json.loads(content)
+            data = json.loads(content_str)
             
             st.success("✅ File loaded successfully!")
             st.info(f"📊 Data structure: {type(data)} with {len(data) if isinstance(data, (dict, list)) else 'unknown'} top-level items")