Add proxy awareness for OpenAPI spec generation

Proxy uri from command line options takes precedence over host and port

test/Main.hs

@@ -20,6 +20,7 @@ import qualified Feature.QuerySpec
 import qualified Feature.RangeSpec
 import qualified Feature.StructureSpec
 import qualified Feature.UnicodeSpec
+import qualified Feature.ProxySpec
 
 main :: IO ()
 main = do
@@ -32,6 +33,7 @@ main = do
   let withApp = return $ postgrest testCfg refDbStructure pool
       ltdApp  = return $ postgrest testLtdRowsCfg refDbStructure pool
       unicodeApp = return $ postgrest testUnicodeCfg refDbStructure pool
+      proxyApp = return $ postgrest testProxyCfg refDbStructure pool
 
   hspec $ do
     mapM_ (beforeAll_ resetDb . before withApp) specs
@@ -44,6 +46,10 @@ main = do
     beforeAll_ resetDb . before unicodeApp $
       describe "Feature.UnicodeSpec" Feature.UnicodeSpec.spec
 
+    -- this test runs with a proxy
+    beforeAll_ resetDb . before proxyApp $
+      describe "Feature.ProxySpec" Feature.ProxySpec.spec
+
  where
   specs = map (uncurry describe) [
       ("Feature.AuthSpec"         , Feature.AuthSpec.spec)