Update app.py

app.py

@@ -13,17 +13,21 @@ def process_song():
         return jsonify({"error": "Please provide a song link with ?song=<url>"}), 400
 
     try:
-        # Download audio file
-        resp = requests.get(url, stream=True)
+        # Download audio file with headers & redirects
+        headers = {"User-Agent": "Mozilla/5.0"}
+        resp = requests.get(url, stream=True, headers=headers, allow_redirects=True, timeout=30)
         resp.raise_for_status()
 
-        # Load audio into pydub
+        # Check if it's really audio
+        if "audio" not in resp.headers.get("Content-Type", ""):
+            return jsonify({"error": f"URL did not return audio, got {resp.headers.get('Content-Type')}"}), 400
+
+        # Load into pydub
         sound = AudioSegment.from_file(io.BytesIO(resp.content), format="mp3")
         sound = effects.normalize(sound)
 
         # Split channels
-        channels = sound.split_to_mono()
-        left, right = channels[0], channels[1]
+        left, right = sound.split_to_mono()
 
         # Empty output
         output = AudioSegment.silent(duration=len(sound), frame_rate=sound.frame_rate)
@@ -50,15 +54,15 @@ def process_song():
             stereo_chunk = AudioSegment.from_mono_audiosegments(left_chunk, right_chunk)
             output += stereo_chunk
 
-        # --- Stereo widening ---
+        # Stereo widening
         widened = output.overlay(output.pan(-0.5), gain_during_overlay=-6)
         widened = widened.overlay(output.pan(0.5), gain_during_overlay=-6)
 
-        # --- Subtle reverb ---
+        # Subtle reverb
         reverb = widened.overlay(widened - 8, delay=reverb_delay)
         reverb = reverb.overlay(widened - 14, delay=reverb_delay * 2)
 
-        # --- Final mastering ---
+        # Final mastering
         final = effects.normalize(reverb)
 
         # Export to memory
@@ -66,7 +70,12 @@ def process_song():
         final.export(buf, format="mp3")
         buf.seek(0)
 
-        return send_file(buf, mimetype="audio/mpeg", as_attachment=True, download_name="panned_heavenly.mp3")
+        return send_file(
+            buf,
+            mimetype="audio/mpeg",
+            as_attachment=True,
+            download_name="panned_heavenly.mp3"
+        )
 
     except Exception as e:
         return jsonify({"error": str(e)}), 500