Unpin most python dependencies

Author: evanc577

requirements.txt

@@ -1,9 +1,9 @@
 cython
 annoy==1.16.3
 Flask
-gunicorn[gevent]==20.0.4
-ImageHash==4.3.1
-piexif==1.1.3
+gunicorn[gevent]
+ImageHash
+piexif
 Pillow
 PyYAML
 Werkzeug
@@ -12,10 +12,10 @@ tldextract
 opencv-python
 opencv-contrib-python
 joblib
-requests-cache==0.5.2
-redis==3.5.2
+requests-cache
+redis
 youtube_dl
 bsddb3
-cachetools==4.2.2
-MarkupSafe==2.0.1
+cachetools
+MarkupSafe
 python-dateutil

src/web_server.py

@@ -110,9 +110,6 @@ def entity_too_large(e):
 
 @app.route('/upload', methods=['POST'])
 def upload():
-    # remove old requests from cache
-    cached_req_session.cache.remove_old_entries(datetime.now() - req_expire_after)
-
     f = request.files['file']
     filename = '{:016x}'.format(random.randint(0, 1<<128))
     path = os.path.join(app.config['UPLOAD_FOLDER'], filename)
@@ -129,9 +126,6 @@ def upload():
 
 @app.route('/')
 def root():
-    # remove old requests from cache
-    cached_req_session.cache.remove_old_entries(datetime.now() - req_expire_after)
-
     return render_page('sourcecatcher.html')