fix: range request with 0 rows and 0 offset return status 416 (#2991)

CHANGELOG.md

@@ -12,6 +12,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
  - #2771, Add `Server-Timing` header with JWT duration - @taimoorzaeem
  - #2698, Add config `jwt-cache-max-lifetime` and implement JWT caching - @taimoorzaeem
  - #2943, Add `handling=strict/lenient` for Prefer header - @taimoorzaeem
+ - #2824, Fix range request with 0 rows and 0 offset return status 416 - @strengthless
 
 ## [11.2.1] - 2023-10-03
 

src/PostgREST/RangeQuery.hs

@@ -104,9 +104,9 @@ rangeStatusHeader topLevelRange queryTotal tableTotal =
     rangeStatus :: Integer -> Integer -> Maybe Integer -> Status
     rangeStatus _ _ Nothing = status200
     rangeStatus lower upper (Just total)
-      | lower >= total && lower /= upper = status416 -- 416 Range Not Satisfiable
-      | (1 + upper - lower) < total      = status206 -- 206 Partial Content
-      | otherwise                        = status200 -- 200 OK
+      | lower >= total && lower /= upper && lower /= 0 = status416 -- 416 Range Not Satisfiable
+      | (1 + upper - lower) < total                    = status206 -- 206 Partial Content
+      | otherwise                                      = status200 -- 200 OK
 
 contentRangeH :: (Integral a, Show a) => a -> a -> Maybe a -> Header
 contentRangeH lower upper total =

test/spec/Feature/Query/RangeSpec.hs

@@ -413,6 +413,15 @@ spec = do
               matchHeader "Content-Range" "10-14/*"
             simpleStatus r `shouldBe` ok200
 
+        it "does not throw error when offset is 0 and and total is 0" $
+          request methodGet "/rpc/getitemrange?min=0&max=0"
+                  (rangeHdrsWithCount $ ByteRangeFromTo 0 1) mempty
+            `shouldRespondWith`
+            [json|[]|]
+            { matchStatus  = 200
+            , matchHeaders = ["Content-Range" <:> "*/0"]
+            }
+
       context "of invalid range" $ do
         it "fails with 416 for offside range" $
           request methodGet  "/items"