fix(helm): render ingress-nginx compatible path types via ingress.controller

ingress-nginx's admission webhook (strict-validate-path-type, on by default
from v1.12.0 until v1.12.6 / v1.13.2 allowed dots again) rejects the chart's
/favicon.ico Exact and /eu.assemblyai Prefix rules, so helm install fails on
any cluster it fronts. A new ingress.controller value (alb, the default, or
nginx) renders dotted built-in paths as ImplementationSpecific under nginx,
which serves them as plain prefix locations, and drops the ALB-only /*.txt
wildcard rule there. The default render is unchanged

helm/litellm/templates/_helpers.tpl

@@ -428,3 +428,16 @@ envFrom:
 {{- end }}
 {{- end }}
 {{- end -}}
+
+{{/*
+ingress-nginx's admission webhook rejects a dot in an Exact or Prefix path
+(strict-validate-path-type) and serves ImplementationSpecific as a plain
+prefix location, so a dotted path takes that type there.
+*/}}
+{{- define "litellm.ingress.pathType" -}}
+{{- if and (eq .controller "nginx") (contains "." .path) -}}
+ImplementationSpecific
+{{- else -}}
+{{- .pathType -}}
+{{- end -}}
+{{- end -}}

helm/litellm/templates/ingress.yaml

@@ -5,6 +5,10 @@
 {{- $gatewayPort := .Values.gateway.service.port -}}
 {{- $backendPort := .Values.backend.service.port -}}
 {{- $uiPort := .Values.ui.service.port -}}
+{{- $controller := .Values.ingress.controller | default "alb" -}}
+{{- if not (has $controller (list "alb" "nginx")) }}
+{{- fail (printf "ingress.controller: unknown controller %q, expected one of alb, nginx" $controller) }}
+{{- end }}
 {{/*
   Backends addressable from ingress.extraPaths, keyed by the `service` field.
 */}}
@@ -27,10 +31,11 @@
   /litellm-asset-prefix, so without /*.txt they fall to the backend catch-all
   → 404 → client-side navigation never settles and the login flow spins in an
   infinite redirect loop (/ ⇄ /ui/login). ui/nginx.conf already serves *.txt
-  from the export; the rule only routes the request to it. Needs an ingress
-  controller whose ImplementationSpecific path is a wildcard pattern
-  (AWS ALB: `*` = 0+ chars); this chart targets the AWS Load Balancer
-  Controller.
+  from the export; the rule only routes the request to it. It needs an
+  ingress controller whose ImplementationSpecific path is a wildcard pattern
+  (AWS ALB: `*` = 0+ chars), so it is rendered for ingress.controller=alb
+  only: ingress-nginx serves ImplementationSpecific as a literal prefix
+  location, where /*.txt can never match.
 */}}
 {{- $uiPaths := list
     (dict "path" "/" "pathType" "Exact")
@@ -38,8 +43,10 @@
     (dict "path" "/litellm-asset-prefix" "pathType" "Prefix")
     (dict "path" "/_next" "pathType" "Prefix")
     (dict "path" "/ui" "pathType" "Prefix")
-    (dict "path" "/*.txt" "pathType" "ImplementationSpecific")
 -}}
+{{- if eq $controller "alb" }}
+{{- $uiPaths = append $uiPaths (dict "path" "/*.txt" "pathType" "ImplementationSpecific") }}
+{{- end }}
 {{/*
   Gateway data-plane prefixes — must mirror gateway/routes/allowlist.py.
   Versioned paths are listed explicitly to avoid routing management routes
@@ -83,12 +90,6 @@
   adding to it.
 */}}
 {{- $builtinPathKeys := list "/test|Exact" "/|Prefix" -}}
-{{- range $uiPaths }}
-{{- $builtinPathKeys = append $builtinPathKeys (printf "%s|%s" .path .pathType) }}
-{{- end }}
-{{- range $gatewayPrefixes }}
-{{- $builtinPathKeys = append $builtinPathKeys (printf "%s|Prefix" .) }}
-{{- end }}
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
@@ -115,8 +116,10 @@ spec:
         paths:
           # --- UI (Next.js static export) ---
           {{- range $uiPaths }}
+          {{- $pathType := include "litellm.ingress.pathType" (dict "controller" $controller "path" .path "pathType" .pathType) }}
+          {{- $builtinPathKeys = append $builtinPathKeys (printf "%s|%s" .path $pathType) }}
           - path: {{ .path }}
-            pathType: {{ .pathType }}
+            pathType: {{ $pathType }}
             backend:
               service:
                 name: {{ $uiName }}
@@ -134,8 +137,10 @@ spec:
                 port:
                   number: {{ $gatewayPort }}
           {{- range $gatewayPrefixes }}
+          {{- $pathType := include "litellm.ingress.pathType" (dict "controller" $controller "path" . "pathType" "Prefix") }}
+          {{- $builtinPathKeys = append $builtinPathKeys (printf "%s|%s" . $pathType) }}
           - path: {{ . }}
-            pathType: Prefix
+            pathType: {{ $pathType }}
             backend:
               service:
                 name: {{ $gatewayName }}
@@ -147,10 +152,11 @@ spec:
             Rendered after every built-in path so an entry can never take
             precedence over a default, and before the backend catch-all.
             Position only decides the match on controllers that honour manifest
-            order: the AWS Load Balancer Controller this chart targets sorts
-            Exact paths first and Prefix paths longest-first, but keeps
+            order: the AWS Load Balancer Controller (ingress.controller=alb)
+            sorts Exact paths first and Prefix paths longest-first, but keeps
             ImplementationSpecific paths in manifest order, which is what the
-            /*.txt rule above already depends on.
+            /*.txt rule above already depends on. ingress-nginx ignores order
+            and serves the longest matching location.
           */}}
           {{- range $idx, $extra := .Values.ingress.extraPaths }}
           {{- if not (kindIs "map" $extra) }}

helm/litellm/tests/ingress_controller_tests.yaml

@@ -0,0 +1,129 @@
+suite: test ingress.controller
+templates:
+  - ingress.yaml
+values:
+  - ./values/required.yaml
+tests:
+  - it: keeps the AWS Load Balancer Controller path types by default
+    set:
+      ingress.enabled: true
+    asserts:
+      - contains:
+          path: spec.rules[0].http.paths
+          content:
+            path: /favicon.ico
+            pathType: Exact
+            backend:
+              service:
+                name: RELEASE-NAME-litellm-ui
+                port:
+                  number: 3000
+      - contains:
+          path: spec.rules[0].http.paths
+          content:
+            path: /eu.assemblyai
+            pathType: Prefix
+            backend:
+              service:
+                name: RELEASE-NAME-litellm-gateway
+                port:
+                  number: 4000
+      - contains:
+          path: spec.rules[0].http.paths
+          content:
+            path: /*.txt
+            pathType: ImplementationSpecific
+            backend:
+              service:
+                name: RELEASE-NAME-litellm-ui
+                port:
+                  number: 3000
+
+  - it: renders no dotted Exact or Prefix path for ingress-nginx, whose admission webhook rejects them
+    set:
+      ingress.enabled: true
+      ingress.controller: nginx
+    asserts:
+      - notMatchRegexRaw:
+          pattern: 'path: /\S*\.\S*\n\s+pathType: (Exact|Prefix)\n'
+      - contains:
+          path: spec.rules[0].http.paths
+          content:
+            path: /favicon.ico
+            pathType: ImplementationSpecific
+            backend:
+              service:
+                name: RELEASE-NAME-litellm-ui
+                port:
+                  number: 3000
+      - contains:
+          path: spec.rules[0].http.paths
+          content:
+            path: /eu.assemblyai
+            pathType: ImplementationSpecific
+            backend:
+              service:
+                name: RELEASE-NAME-litellm-gateway
+                port:
+                  number: 4000
+
+  - it: drops the /*.txt wildcard for ingress-nginx and keeps every other route as is
+    set:
+      ingress.enabled: true
+      ingress.controller: nginx
+    asserts:
+      - notContains:
+          path: spec.rules[0].http.paths
+          content:
+            path: /*.txt
+          any: true
+      - contains:
+          path: spec.rules[0].http.paths
+          content:
+            path: /ui
+            pathType: Prefix
+            backend:
+              service:
+                name: RELEASE-NAME-litellm-ui
+                port:
+                  number: 3000
+      - contains:
+          path: spec.rules[0].http.paths
+          content:
+            path: /test
+            pathType: Exact
+            backend:
+              service:
+                name: RELEASE-NAME-litellm-gateway
+                port:
+                  number: 4000
+      - equal:
+          path: spec.rules[0].http.paths[-1]
+          value:
+            path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: RELEASE-NAME-litellm-backend
+                port:
+                  number: 4001
+
+  - it: rejects an extraPaths entry that repeats a built-in path at the pathType ingress-nginx renders it with
+    set:
+      ingress.enabled: true
+      ingress.controller: nginx
+      ingress.extraPaths:
+        - path: /favicon.ico
+          service: ui
+          pathType: ImplementationSpecific
+    asserts:
+      - failedTemplate:
+          errorMessage: "ingress.extraPaths[0]: path /favicon.ico with pathType ImplementationSpecific is already routed by this chart, and a duplicate would take it over rather than add to it"
+
+  - it: rejects a controller it has no path types for
+    set:
+      ingress.enabled: true
+      ingress.controller: traefik
+    asserts:
+      - failedTemplate:
+          errorMessage: 'ingress.controller: unknown controller "traefik", expected one of alb, nginx'

helm/litellm/values.yaml

@@ -10,6 +10,17 @@ imagePullSecrets: []
 ingress:
   enabled: false
   className: ""
+  # Which ingress controller serves this Ingress. Controllers disagree on the
+  # pathTypes they accept, so this picks the pathType of a few built-in paths:
+  #   alb    AWS Load Balancer Controller (default): Exact and Prefix paths plus
+  #          the /*.txt wildcard that routes the UI's RSC payloads.
+  #   nginx  ingress-nginx: its admission webhook rejects a dot in an Exact or
+  #          Prefix path (strict-validate-path-type, on by default from v1.12.0
+  #          until v1.12.6 / v1.13.2 allowed dots again), so /favicon.ico and
+  #          /eu.assemblyai render as ImplementationSpecific, which nginx serves
+  #          as a plain prefix location. /*.txt is dropped: nginx has no
+  #          wildcard pathType, so that rule could never match there.
+  controller: alb
   annotations: {}
   host: ""        # optional; if set, becomes the rule's host
   tls: []