fix: Set cache headers to refresh after an hour (#20)

Author: DenverCoder1

action.py

@@ -105,10 +105,10 @@ def parse_video(self, video: Dict[str, Any]) -> str:
             "id": video_id,
             "title": video["title"],
             "timestamp": int(time.mktime(video["published_parsed"])),
-            "width": self._card_width,
             "background_color": self._background_color,
             "title_color": self._title_color,
             "stats_color": self._stats_color,
+            "width": self._card_width,
         }
         if video_id in self._youtube_data:
             content_details = self._youtube_data[video_id]["contentDetails"]

web/app.py

@@ -1,4 +1,5 @@
 from datetime import datetime
+from time import gmtime, strftime
 
 from flask import Flask, render_template, request
 from flask.wrappers import Response
@@ -62,3 +63,14 @@ def render():
             status=status,
             mimetype="image/svg+xml",
         )
+
+
+@app.after_request
+def add_header(r):
+    """Add headers to cache the response no longer than an hour."""
+    r.headers["Expires"] = strftime(
+        "%a, %d %b %Y %H:%M:%S GMT", gmtime(datetime.now().timestamp() + 3600)
+    )
+    r.headers["Last-Modified"] = strftime("%a, %d %b %Y %H:%M:%S GMT", gmtime())
+    r.headers["Cache-Control"] = "public, max-age=3600"
+    return r