Dockerfile has typo in server proxy uri variable (#968)

* s/URL/URI/ in dockerfile

* Treat blank proxy uri as missing

CHANGELOG.md

@@ -11,6 +11,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- #968, Treat blank proxy uri as missing - @begriffs
+
 ## [0.4.3.0] - 2017-09-06
 
 ### Added

docker/Dockerfile

@@ -30,7 +30,7 @@ ENV PGRST_DB_URI= \
     PGRST_DB_POOL=100 \
     PGRST_SERVER_HOST=*4 \
     PGRST_SERVER_PORT=3000 \
-    PGRST_SERVER_PROXY_URL= \
+    PGRST_SERVER_PROXY_URI= \
     PGRST_JWT_SECRET= \
     PGRST_SECRET_IS_BASE64=false \
     PGRST_MAX_ROWS= \

src/PostgREST/Config.hs

@@ -106,7 +106,7 @@ readOptions = do
         AppConfig <$>
             C.key "db-uri"
           <*> C.key "db-anon-role"
-          <*> C.key "server-proxy-uri"
+          <*> (mfilter (/= "") <$> C.key "server-proxy-uri")
           <*> C.key "db-schema"
           <*> (fromMaybe "*4" . mfilter (/= "") <$> C.key "server-host")
           <*> (fromMaybe 3000 . join . fmap coerceInt <$> C.key "server-port")