[Repo Assist] Make Http.AppendQueryToUrl public (#1664)

* Make Http.AppendQueryToUrl public (closes #1325)

Remove `internal` modifier from `Http.AppendQueryToUrl` so callers can
use it directly to build query strings without duplicating the escaping
logic.  Five unit tests added.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: github-actions[bot]

RELEASE_NOTES.md

@@ -2,6 +2,7 @@
 
 ## 8.1.0-beta
 
+- Make `Http.AppendQueryToUrl` public (closes #1325)
 - Add `PreferOptionals` parameter to `JsonProvider` and `XmlProvider` (defaults to `true` to match existing behavior; set to `false` to use empty string or `NaN` for missing values, like the CsvProvider default) (closes #649)
 
 ## 8.0.0 - Feb 25 2026

src/FSharp.Data.Http/Http.fs

@@ -2004,7 +2004,7 @@ type Http private () =
         (WebUtility.UrlEncode query).Replace("+", "%20")
 
     /// Appends the query parameters to the url, taking care of proper escaping
-    static member internal AppendQueryToUrl(url: string, query) =
+    static member AppendQueryToUrl(url: string, query) =
         match query with
         | [] -> url
         | query ->

tests/FSharp.Data.Core.Tests/Http.fs

@@ -69,6 +69,30 @@ let startHttpLocalServer() =
         member this.WorkerTask = workerTask
         member this.BaseAddress = baseAddress }
 
+[<Test>]
+let ``AppendQueryToUrl with no query returns url unchanged`` () =
+    Http.AppendQueryToUrl("https://example.com/api", []) |> should equal "https://example.com/api"
+
+[<Test>]
+let ``AppendQueryToUrl appends query parameters`` () =
+    Http.AppendQueryToUrl("https://example.com/api", [ "key", "value" ])
+    |> should equal "https://example.com/api?key=value"
+
+[<Test>]
+let ``AppendQueryToUrl appends multiple query parameters`` () =
+    Http.AppendQueryToUrl("https://example.com/api", [ "a", "1"; "b", "2" ])
+    |> should equal "https://example.com/api?a=1&b=2"
+
+[<Test>]
+let ``AppendQueryToUrl uses ampersand when url already contains query`` () =
+    Http.AppendQueryToUrl("https://example.com/api?existing=x", [ "key", "value" ])
+    |> should equal "https://example.com/api?existing=x&key=value"
+
+[<Test>]
+let ``AppendQueryToUrl percent-encodes special characters in keys and values`` () =
+    Http.AppendQueryToUrl("https://example.com/search", [ "q", "hello world" ])
+    |> should equal "https://example.com/search?q=hello%20world"
+
 [<Test>]
 let ``Don't throw exceptions on http error`` () =
     use localServer = startHttpLocalServer()