Revert "Fix swagger-ui when "server-proxy-uri" is not set (#857)"

This was a bug in swagger-ui, not postgrest

CHANGELOG.md

@@ -25,7 +25,6 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Resource embedding in views referencing tables in public schema - @fab1an
 - #777, Empty body is allowed when calling a non-parameterized RPC - @koulakis
 - #831, Fix proc resource embedding issue with search_path - @steve-chavez
-- #857, Fix swagger-ui when "server-proxy-uri" is not set - @feynmanliang
 - #547, Use read-only transaction for stable/immutable RPC - @begriffs
 
 ## [0.4.0.0] - 2017-01-19

src/PostgREST/App.hs

@@ -245,7 +245,7 @@ app dbStructure conf apiRequest =
           let host = configHost conf
               port = toInteger $ configPort conf
               proxy = pickProxy $ toS <$> configProxyUri conf
-              uri Nothing = ("http", host, port, "")
+              uri Nothing = ("http", host, port, "/")
               uri (Just Proxy { proxyScheme = s, proxyHost = h, proxyPort = p, proxyPath = b }) = (s, h, p, b)
               uri' = uri proxy
               encodeApi ti = encodeOpenAPI (M.elems $ dbProcs dbStructure) ti uri'