Support encoded path in router (#1347)

Encoded path means the URL path contains encoded string like "/foo%2Fbar".
Gorilla/Mux by default doesn't enable encoded path support, you need to enable
it when initializing the router.

This PR adds a new environment variable USE_ENCODED_PATH to the router
deployment to enable encoded path support.

charts/fission-core/templates/router.yaml

@@ -53,10 +53,12 @@ spec:
             value: {{ .Values.router.svcAddressMaxRetries | default 5 | quote }}
           - name: ROUTER_SVC_ADDRESS_UPDATE_TIMEOUT
             value: {{ .Values.router.svcAddressUpdateTimeout | default "30s" | quote }}
-          - name: DEBUG_ENV
-            value: {{ .Values.debugEnv | quote }}
           - name: TRACING_SAMPLING_RATE
             value: {{ .Values.traceSamplingRate | default "0.5" | quote }}
+          - name: USE_ENCODED_PATH
+            value: {{ .Values.router.useEncodedPath | default false | quote }}
+          - name: DEBUG_ENV
+            value: {{ .Values.debugEnv | quote }}
 {{- if .Values.analytics }}
           - name: ANALYTICS_URL
             value: "https://g.fission.sh/metrics"

charts/fission-core/values.yaml

@@ -53,6 +53,12 @@ router:
   ## Add annotations for router
   # svcAnnotations:
   #   cloud.google.com/load-balancer-type: Internal
+  
+  ## For router to match encoded path.
+  ## If true, "/foo%2Fbar" will match the path "/{var}";
+  ## Otherwise, it will match the path "/foo/bar".
+  useEncodedPath: false
+  
   roundTrip:
     ## If true, router will disable the HTTP keep-alive which result in performance degradation.
     ## But it ensures that router can redirect new coming requests to new function pods.