diff --git a/alertproviders/http_alert_provider.py b/alertproviders/http_alert_provider.py
index a59a003..1abb4ee 100644
--- a/alertproviders/http_alert_provider.py
+++ b/alertproviders/http_alert_provider.py
@@ -54,7 +54,7 @@ class HTTPAlertProvider(AlertProvider):
                 logging.debug("Received data from " + self.name + " alert API.")
             else:
                 self.status = "Error"
-                logging.warning(f"{self.name} alert API returned HTTP {http_response.status_code}.")
+                logging.warning(f"HTTP {http_response.status_code} when calling {self.name} alerts API.")
 
         except Exception:
             self.status = "Error"
diff --git a/core/cache_utils.py b/core/cache_utils.py
index 2ec492c..68e521f 100644
--- a/core/cache_utils.py
+++ b/core/cache_utils.py
@@ -8,8 +8,11 @@ from requests_cache import CachedSession
 # of time has passed. This is used throughout Spothole to cache data that does not change
 # rapidly. The ThreadSafeSession construct here protects it against some multithreading
 # contention weirdness we sometimes used to see on startup where the cache was hammered
-# pretty hard.
-_session = CachedSession("cache/semi_static_url_data_cache", expire_after=timedelta(days=30))
+# pretty hard. The expanded list of allowable_codes ensures we also cache and return 400-type
+# responses, e.g "this SOTA summit ref doesn't actually exist", to avoid hammering remote
+# servers for data they've told us they can't provide.
+_session = CachedSession("cache/semi_static_url_data_cache", expire_after=timedelta(days=30),
+                         allowable_codes=(200, 400, 401, 403, 404))
 _lock = threading.Lock()
 
 
diff --git a/solarconditionsproviders/giroionosonde.py b/solarconditionsproviders/giroionosonde.py
index 86d2042..c85960d 100644
--- a/solarconditionsproviders/giroionosonde.py
+++ b/solarconditionsproviders/giroionosonde.py
@@ -129,7 +129,7 @@ class GIROIonosonde(SolarConditionsProvider):
         url = f"{LGDC_URL}?ursiCode={ursi}&charName=foF2,MUFD,fmin&DMUF=3000&fromDate={from_str}&toDate={to_str}"
         http_response = requests.get(url, headers=HTTP_HEADERS, timeout=(5, 15))
         if http_response.status_code != 200:
-            logging.warning(f"Giro ionosonde API returned HTTP {http_response.status_code}.")
+            logging.warning(f"HTTP {http_response.status_code} when calling Giro ionosonde API.")
             return None, None, None
         return self._parse_all(http_response.text)
 
diff --git a/solarconditionsproviders/http_solar_conditions_provider.py b/solarconditionsproviders/http_solar_conditions_provider.py
index 4a639fd..b3a0064 100644
--- a/solarconditionsproviders/http_solar_conditions_provider.py
+++ b/solarconditionsproviders/http_solar_conditions_provider.py
@@ -49,7 +49,7 @@ class HTTPSolarConditionsProvider(SolarConditionsProvider):
                 logging.debug("Received data from " + self.name + " solar conditions API.")
             else:
                 self.status = "Error"
-                logging.warning(f"{self.name} solar conditions API returned HTTP {http_response.status_code}.")
+                logging.warning(f"HTTP {http_response.status_code} when calling {self.name} solar conditions API.")
 
         except Exception:
             self.status = "Error"
diff --git a/solarconditionsproviders/kc2gprop.py b/solarconditionsproviders/kc2gprop.py
index 99660ad..d1aa1b0 100644
--- a/solarconditionsproviders/kc2gprop.py
+++ b/solarconditionsproviders/kc2gprop.py
@@ -46,7 +46,7 @@ class KC2GProp(SolarConditionsProvider):
             logging.debug("Polling KC2G ionosonde data...")
             http_response = requests.get(KC2G_URL, headers=HTTP_HEADERS, timeout=(5, 30))
             if http_response.status_code != 200:
-                logging.warning(f"KC2G ionosonde API returned HTTP {http_response.status_code}")
+                logging.warning(f"HTTP {http_response.status_code} when calling KG2G ionosonde API.")
                 return
 
             now = datetime.now(timezone.utc)
diff --git a/spotproviders/http_spot_provider.py b/spotproviders/http_spot_provider.py
index 57bd046..37038c7 100644
--- a/spotproviders/http_spot_provider.py
+++ b/spotproviders/http_spot_provider.py
@@ -54,7 +54,7 @@ class HTTPSpotProvider(SpotProvider):
                 logging.debug("Received data from " + self.name + " spot API.")
             else:
                 self.status = "Error"
-                logging.warning(f"{self.name} spot API returned HTTP {http_response.status_code}.")
+                logging.warning(f"HTTP {http_response.status_code} when calling {self.name} spot API.")
 
         except Exception:
             self.status = "Error"
diff --git a/templates/add_spot.html b/templates/add_spot.html
index 587c910..56b2739 100644
--- a/templates/add_spot.html
+++ b/templates/add_spot.html
@@ -76,7 +76,7 @@
 
 </div>
 
-<script src="/js/add-spot.js?v=1784963837"></script>
+<script src="/js/add-spot.js?v=1784964562"></script>
 <script>$(document).ready(function () {
     $("#nav-link-add-spot").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/alerts.html b/templates/alerts.html
index 26dff8c..73f0081 100644
--- a/templates/alerts.html
+++ b/templates/alerts.html
@@ -75,7 +75,7 @@
 
 </div>
 
-<script src="/js/alerts.js?v=1784963837"></script>
+<script src="/js/alerts.js?v=1784964563"></script>
 <script>$(document).ready(function () {
     $("#nav-link-alerts").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/bands.html b/templates/bands.html
index 5c0203a..a4d206f 100644
--- a/templates/bands.html
+++ b/templates/bands.html
@@ -75,8 +75,8 @@
 <script>
     let spotProvidersEnabledByDefault = {% raw json_encode(web_ui_options["spot-providers-enabled-by-default"]) %};
 </script>
-<script src="/js/spotsbandsandmap.js?v=1784963837"></script>
-<script src="/js/bands.js?v=1784963837"></script>
+<script src="/js/spotsbandsandmap.js?v=1784964562"></script>
+<script src="/js/bands.js?v=1784964562"></script>
 <script>$(document).ready(function () {
     $("#nav-link-bands").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/base.html b/templates/base.html
index a801bba..45842c0 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -1,6 +1,6 @@
 {% extends "skeleton.html" %}
 {% block head_extra %}
-<link rel="stylesheet" href="/css/style.css?v=1784963837" type="text/css">
+<link rel="stylesheet" href="/css/style.css?v=1784964562" type="text/css">
 <link href="/vendor/css/bootstrap-5.3.8.min.css" rel="stylesheet">
 <link href="/vendor/css/fontawesome-6.7.2.min.css" rel="stylesheet">
 <link href="/vendor/css/solid-6.7.2.min.css" rel="stylesheet">
@@ -10,10 +10,10 @@
 <script src="/vendor/js/bootstrap-5.3.8.bundle.min.js"></script>
 <script src="/vendor/js/tinycolor2-1.6.0.min.js"></script>
 
-<script src="/js/utils.js?v=1784963837"></script>
-<script src="/js/ui-ham.js?v=1784963837"></script>
-<script src="/js/geo.js?v=1784963837"></script>
-<script src="/js/common.js?v=1784963837"></script>
+<script src="/js/utils.js?v=1784964562"></script>
+<script src="/js/ui-ham.js?v=1784964562"></script>
+<script src="/js/geo.js?v=1784964562"></script>
+<script src="/js/common.js?v=1784964562"></script>
 {% end %}
 {% block body %}
 <div class="container">
diff --git a/templates/conditions.html b/templates/conditions.html
index 8124c77..15273a7 100644
--- a/templates/conditions.html
+++ b/templates/conditions.html
@@ -284,7 +284,7 @@
 </div>
 
 <script src="/vendor/js/chart-4.4.9.umd.min.js"></script>
-<script src="/js/conditions.js?v=1784963837"></script>
+<script src="/js/conditions.js?v=1784964562"></script>
 <script>$(document).ready(function () {
     $("#nav-link-conditions").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/map.html b/templates/map.html
index ec5c18d..2e64fba 100644
--- a/templates/map.html
+++ b/templates/map.html
@@ -95,8 +95,8 @@
 <script>
     let spotProvidersEnabledByDefault = {% raw json_encode(web_ui_options["spot-providers-enabled-by-default"]) %};
 </script>
-<script src="/js/spotsbandsandmap.js?v=1784963837"></script>
-<script src="/js/map.js?v=1784963837"></script>
+<script src="/js/spotsbandsandmap.js?v=1784964563"></script>
+<script src="/js/map.js?v=1784964563"></script>
 <script>$(document).ready(function () {
     $("#nav-link-map").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/spots.html b/templates/spots.html
index 701fce4..22fc625 100644
--- a/templates/spots.html
+++ b/templates/spots.html
@@ -116,8 +116,8 @@
 <script>
     let spotProvidersEnabledByDefault = {% raw json_encode(web_ui_options["spot-providers-enabled-by-default"]) %};
 </script>
-<script src="/js/spotsbandsandmap.js?v=1784963837"></script>
-<script src="/js/spots.js?v=1784963837"></script>
+<script src="/js/spotsbandsandmap.js?v=1784964562"></script>
+<script src="/js/spots.js?v=1784964562"></script>
 <script>$(document).ready(function () {
     $("#nav-link-spots").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/status.html b/templates/status.html
index 0454209..3da2d06 100644
--- a/templates/status.html
+++ b/templates/status.html
@@ -59,7 +59,7 @@
     </div>
 </div>
 
-<script src="/js/status.js?v=1784963837"></script>
+<script src="/js/status.js?v=1784964562"></script>
 <script>
     $(document).ready(function () {
         $("#nav-link-status").addClass("active");