diff --git a/README.md b/README.md
index 5a597dc7..18521578 100644
--- a/README.md
+++ b/README.md
@@ -174,7 +174,9 @@ SpoolMan can print QR-code stickers for every spool; follow the SpoolMan label g
   - set `PRINTER_ID` — find it in the printer settings under Setting → Device → Printer SN.
    - set `PRINTER_ACCESS_CODE` — find it in Setting → LAN Only Mode → Access Code (the LAN Only Mode toggle may stay off).
    - set `PRINTER_IP` — found in Setting → LAN Only Mode → IP Address.
-   - set `SPOOLMAN_BASE_URL` — the URL of your SpoolMan installation without trailing slash.
+   - set `SPOOLMAN_BASE_URL` — the URL of your SpoolMan installation without trailing slash. Used for UI links (menu, spool detail pages) and as the default for API calls when `SPOOLMAN_API_URL` is not set.
+   - set `SPOOLMAN_UI_URL` *(optional)* — semantic alias for `SPOOLMAN_BASE_URL`; either variable satisfies the requirement. If both are set, `SPOOLMAN_BASE_URL` takes precedence.
+   - set `SPOOLMAN_API_URL` *(optional)* — the URL OpenSpoolMan uses for backend API calls to SpoolMan (without trailing slash). Defaults to `SPOOLMAN_BASE_URL`. Useful for reverse-proxy / split-horizon setups where the container reaches SpoolMan via internal DNS (e.g. `http://spoolman:8000`) while the browser needs a public hostname (e.g. `https://spoolman.example.com`).
   - set `AUTO_SPEND` to `True` to enable legacy slicer-estimate tracking (no live layer tracking).
   - set `TRACK_LAYER_USAGE` to `True` to switch to per-layer tracking/consumption **while `AUTO_SPEND` is also `True`**. If `AUTO_SPEND` is `False`, all filament tracking remains disabled regardless of `TRACK_LAYER_USAGE`.
   - set `AUTO_SPEND` to `True` if you want automatic filament usage tracking (see the AUTO SPEND notes below).
diff --git a/config.env.template b/config.env.template
index ba26bfa2..c8060783 100644
--- a/config.env.template
+++ b/config.env.template
@@ -6,7 +6,11 @@ PRINTER_IP=
 PRINTER_NAME=
 SPOOLMAN_BASE_URL=
 AUTO_SPEND=False
-TRACK_LAYER_USAGE=False
-SPOOL_SORTING=filament.material:asc,filament.vendor.name:asc,filament.name:asc
-CLEAR_ASSIGNMENT_WHEN_EMPTY=False
-COLOR_DISTANCE_TOLERANCE=40
+TRACK_LAYER_USAGE=False
+SPOOL_SORTING=filament.material:asc,filament.vendor.name:asc,filament.name:asc
+CLEAR_ASSIGNMENT_WHEN_EMPTY=False
+COLOR_DISTANCE_TOLERANCE=40
+
+# Allow API and UI URLs to differ (reverse-proxy friendly)
+# SPOOLMAN_UI_URL= # Semantic alias for SPOOLMAN_BASE_URL
+# SPOOLMAN_API_URL=http://spoolman:8000 # The Backend reaches Spoolman via internal Docker DNS
diff --git a/config.py b/config.py
index ca30dadd..3eff41c0 100644
--- a/config.py
+++ b/config.py
@@ -35,8 +35,9 @@ def _env_to_int(name: str, default: int) -> int:
 PRINTER_CODE = os.getenv("PRINTER_ACCESS_CODE")  # Printer access code - Run init_bambulab.py
 PRINTER_IP = os.getenv("PRINTER_IP")  # Printer local IP address - Check wireless on printer
 PRINTER_NAME = os.getenv("PRINTER_NAME")  # Printer name - Check wireless on printer
-SPOOLMAN_BASE_URL = os.getenv("SPOOLMAN_BASE_URL")
-SPOOLMAN_API_URL = f"{SPOOLMAN_BASE_URL}/api/v1"
+SPOOLMAN_BASE_URL = os.getenv("SPOOLMAN_BASE_URL") or os.getenv("SPOOLMAN_UI_URL")
+SPOOLMAN_API_URL = os.getenv("SPOOLMAN_API_URL") or SPOOLMAN_BASE_URL
+SPOOLMAN_API_V1 = f"{SPOOLMAN_API_URL}/api/v1"
 AUTO_SPEND = _env_to_bool("AUTO_SPEND", False)
 TRACK_LAYER_USAGE = _env_to_bool("TRACK_LAYER_USAGE", False)
 SPOOL_SORTING = os.getenv(
diff --git a/spoolman_client.py b/spoolman_client.py
index 7c8b51a0..acd47ac6 100644
--- a/spoolman_client.py
+++ b/spoolman_client.py
@@ -1,5 +1,5 @@
 import requests
-from config import SPOOLMAN_API_URL, SPOOL_SORTING
+from config import SPOOLMAN_API_V1, SPOOL_SORTING
 import json
 from logger import append_to_rotating_file, log
 
@@ -31,7 +31,7 @@ def patchExtraTags(spool_id, old_extras, new_extras):
   for key, value in new_extras.items():
     old_extras[key] = value
 
-  resp = requests.patch(f"{SPOOLMAN_API_URL}/spool/{spool_id}", json={
+  resp = requests.patch(f"{SPOOLMAN_API_V1}/spool/{spool_id}", json={
     "extra": old_extras
   })
   _log_spoolman_change(
@@ -45,27 +45,27 @@ def patchExtraTags(spool_id, old_extras, new_extras):
 
 
 def getSpoolById(spool_id):
-  response = requests.get(f"{SPOOLMAN_API_URL}/spool/{spool_id}")
-  #print(response.status_code)
-  #print(response.text)
-  return response.json()
-
-
-def fetchSpoolList():
-  if SPOOL_SORTING:
-    response = requests.get(f"{SPOOLMAN_API_URL}/spool?sort={SPOOL_SORTING}")
-  else:
-    response = requests.get(f"{SPOOLMAN_API_URL}/spool")
-    
-  #print(response.status_code)
-  #print(response.text)
-  return response.json()
-
-def consumeSpool(spool_id, use_weight=None, use_length=None):
-  if use_weight is None and use_length is None:
-    raise ValueError("use_weight or use_length is required")
-
-  payload = {}
+  response = requests.get(f"{SPOOLMAN_API_V1}/spool/{spool_id}")
+  #print(response.status_code)
+  #print(response.text)
+  return response.json()
+
+
+def fetchSpoolList():
+  if SPOOL_SORTING:
+    response = requests.get(f"{SPOOLMAN_API_V1}/spool?sort={SPOOL_SORTING}")
+  else:
+    response = requests.get(f"{SPOOLMAN_API_V1}/spool")
+    
+  #print(response.status_code)
+  #print(response.text)
+  return response.json()
+
+def consumeSpool(spool_id, use_weight=None, use_length=None):
+  if use_weight is None and use_length is None:
+    raise ValueError("use_weight or use_length is required")
+
+  payload = {}
   if use_weight is not None:
     payload["use_weight"] = use_weight
   if use_length is not None:
@@ -73,7 +73,7 @@ def consumeSpool(spool_id, use_weight=None, use_length=None):
 
   log(f'Consuming {payload} from spool {spool_id}')
 
-  response = requests.put(f"{SPOOLMAN_API_URL}/spool/{spool_id}/use", json=payload)
+  response = requests.put(f"{SPOOLMAN_API_V1}/spool/{spool_id}/use", json=payload)
   _log_spoolman_change(
     "consume_spool",
     spool_id=spool_id,
@@ -82,25 +82,25 @@ def consumeSpool(spool_id, use_weight=None, use_length=None):
   )
   #print(response.status_code)
   #print(response.text)
-
-def fetchSettings():
-  response = requests.get(f"{SPOOLMAN_API_URL}/setting/")
-  #print(response.status_code)
-  #print(response.text)
-
-  # JSON in ein Python-Dictionary laden
-  data = response.json()
-
-  # Extrahiere die Werte aus den relevanten Feldern
-  extra_fields_spool = json.loads(data["extra_fields_spool"]["value"])
-  extra_fields_filament = json.loads(data["extra_fields_filament"]["value"])
-  base_url = data["base_url"]["value"]
-  currency = data["currency"]["value"]
-
-  settings = {}
-  settings["extra_fields_spool"] = extra_fields_spool 
-  settings["extra_fields_filament"] = extra_fields_filament
-  settings["base_url"] = base_url.replace('"', '')
-  settings["currency"] = currency.replace('"', '')
-
+
+def fetchSettings():
+  response = requests.get(f"{SPOOLMAN_API_V1}/setting/")
+  #print(response.status_code)
+  #print(response.text)
+
+  # JSON in ein Python-Dictionary laden
+  data = response.json()
+
+  # Extrahiere die Werte aus den relevanten Feldern
+  extra_fields_spool = json.loads(data["extra_fields_spool"]["value"])
+  extra_fields_filament = json.loads(data["extra_fields_filament"]["value"])
+  base_url = data["base_url"]["value"]
+  currency = data["currency"]["value"]
+
+  settings = {}
+  settings["extra_fields_spool"] = extra_fields_spool 
+  settings["extra_fields_filament"] = extra_fields_filament
+  settings["base_url"] = base_url.replace('"', '')
+  settings["currency"] = currency.replace('"', '')
+
   return settings