diff --git a/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj b/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj
index f583f64ed..7d051e322 100644
--- a/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj
+++ b/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj
@@ -37,6 +37,7 @@
     <Compile Include="HtmlOperations.fs" />
     <Compile Include="HtmlAttributeExtensions.fs" />
     <Compile Include="HtmlCssSelectors.fs" />
+    <Compile Include="XmlExtensions.fs" />
     <Compile Include="WorldBankRuntime.fs" />
     <Compile Include="Program.fs" />
   </ItemGroup>
diff --git a/tests/FSharp.Data.Core.Tests/XmlExtensions.fs b/tests/FSharp.Data.Core.Tests/XmlExtensions.fs
new file mode 100644
index 000000000..a30a1d7ae
--- /dev/null
+++ b/tests/FSharp.Data.Core.Tests/XmlExtensions.fs
@@ -0,0 +1,251 @@
+module FSharp.Data.Tests.XmlExtensions
+
+open FsUnit
+open NUnit.Framework
+open System
+open System.Xml.Linq
+open FSharp.Data
+open FSharp.Data.HttpRequestHeaders
+open Microsoft.AspNetCore.Builder
+open Microsoft.AspNetCore.Http
+open System.Threading.Tasks
+open System.Net.NetworkInformation
+open System.IO
+open System.Text
+
+type ITestHttpServer =
+    inherit IDisposable
+    abstract member BaseAddress: string
+    abstract member WorkerTask: Task
+
+let startXmlHttpLocalServer() =
+    let app = WebApplication.CreateBuilder().Build()
+    
+    // Handle XML POST requests and echo back the received XML
+    app.Map("/echo", (fun (ctx: HttpContext) ->
+        async {
+            use reader = new StreamReader(ctx.Request.Body)
+            let! body = reader.ReadToEndAsync() |> Async.AwaitTask
+            
+            ctx.Response.ContentType <- "application/xml"
+            ctx.Response.StatusCode <- 200
+            
+            // Echo back the received XML with a wrapper to validate it was received
+            let responseXml = $"<response><received>{body}</received></response>"
+            return! ctx.Response.WriteAsync(responseXml) |> Async.AwaitTask
+        } |> Async.StartAsTask :> Task
+    )) |> ignore
+    
+    // Handle different HTTP methods
+    app.Map("/test/{method}", (fun (ctx: HttpContext) ->
+        async {
+            let method = ctx.Request.RouteValues.["method"] :?> string
+            let actualMethod = ctx.Request.Method
+            
+            ctx.Response.ContentType <- "application/xml"
+            ctx.Response.StatusCode <- 200
+            
+            let responseXml = $"<response><method>{actualMethod}</method><expected>{method}</expected></response>"
+            return! ctx.Response.WriteAsync(responseXml) |> Async.AwaitTask
+        } |> Async.StartAsTask :> Task
+    )) |> ignore
+
+    let freePort =
+        let random = new System.Random()
+        let mutable port = random.Next(10000, 65000)
+        while
+            IPGlobalProperties.GetIPGlobalProperties().GetActiveTcpListeners()
+            |> Array.map (fun x -> x.Port)
+            |> Array.contains port do
+                port <- random.Next(10000, 65000)
+        port
+
+    let baseAddress = $"http://localhost:{freePort}"
+    let workerTask = app.RunAsync(baseAddress)
+
+    { new ITestHttpServer with
+        member this.Dispose() =
+            app.StopAsync() |> Async.AwaitTask |> ignore
+        member this.WorkerTask = workerTask
+        member this.BaseAddress = baseAddress }
+
+[<Test>]
+let ``XElement.Request sends XML via POST by default`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100) // Let server start
+    
+    let xml = XElement(XName.Get("test"), "sample content")
+    let response = xml.Request(localServer.BaseAddress + "/echo")
+    
+    response.StatusCode |> should equal 200
+    match response.Body with
+    | Text bodyText -> bodyText |> should contain "<test>sample content</test>"
+    | Binary _ -> failwith "Expected text response, but got binary"
+
+[<Test>]
+let ``XElement.Request with custom HTTP method`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = XElement(XName.Get("test"), "content")
+    let response = xml.Request(localServer.BaseAddress + "/test/PUT", httpMethod = HttpMethod.Put)
+    
+    response.StatusCode |> should equal 200
+    match response.Body with
+    | Text bodyText -> bodyText |> should contain "<method>PUT</method>"
+    | Binary _ -> failwith "Expected text response, but got binary"
+
+[<Test>]
+let ``XElement.Request includes default User-Agent header`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = XElement(XName.Get("test"))
+    let response = xml.Request(localServer.BaseAddress + "/echo")
+    
+    // The User-Agent should be set to the default value
+    response.StatusCode |> should equal 200
+
+[<Test>]
+let ``XElement.Request with custom headers`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = XElement(XName.Get("test"))
+    let customHeaders = [("X-Custom-Header", "test-value")]
+    let response = xml.Request(localServer.BaseAddress + "/echo", headers = customHeaders)
+    
+    response.StatusCode |> should equal 200
+
+[<Test>]
+let ``XElement.Request preserves existing User-Agent when provided`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = XElement(XName.Get("test"))
+    let customHeaders = [UserAgent "CustomAgent/1.0"]
+    let response = xml.Request(localServer.BaseAddress + "/echo", headers = customHeaders)
+    
+    response.StatusCode |> should equal 200
+
+[<Test>]
+let ``XElement.Request includes XML content type header`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = XElement(XName.Get("test"))
+    let response = xml.Request(localServer.BaseAddress + "/echo")
+    
+    // Should include Content-Type: application/xml
+    response.StatusCode |> should equal 200
+
+[<Test>]
+let ``XElement.Request with complex XML structure`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = 
+        XElement(XName.Get("root"),
+            XElement(XName.Get("child1"), "value1"),
+            XElement(XName.Get("child2"), 
+                XAttribute(XName.Get("attr"), "attrvalue"),
+                "value2"))
+    
+    let response = xml.Request(localServer.BaseAddress + "/echo")
+    
+    response.StatusCode |> should equal 200
+    match response.Body with
+    | Text bodyText -> 
+        bodyText |> should contain "<child1>value1</child1>"
+        bodyText |> should contain "<child2 attr=\"attrvalue\">value2</child2>"
+    | Binary _ -> failwith "Expected text response, but got binary"
+
+[<Test>]
+let ``XElement.RequestAsync sends XML via POST by default`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = XElement(XName.Get("test"), "async content")
+    let response = xml.RequestAsync(localServer.BaseAddress + "/echo") |> Async.RunSynchronously
+    
+    response.StatusCode |> should equal 200
+    match response.Body with
+    | Text bodyText -> bodyText |> should contain "<test>async content</test>"
+    | Binary _ -> failwith "Expected text response, but got binary"
+
+[<Test>]
+let ``XElement.RequestAsync with custom HTTP method`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = XElement(XName.Get("test"))
+    let response = xml.RequestAsync(localServer.BaseAddress + "/test/PUT", httpMethod = HttpMethod.Put) |> Async.RunSynchronously
+    
+    response.StatusCode |> should equal 200
+    match response.Body with
+    | Text bodyText -> bodyText |> should contain "<method>PUT</method>"
+    | Binary _ -> failwith "Expected text response, but got binary"
+
+[<Test>]
+let ``XElement.RequestAsync with custom headers`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = XElement(XName.Get("test"))
+    let customHeaders = [("X-Async-Header", "async-value")]
+    let response = xml.RequestAsync(localServer.BaseAddress + "/echo", headers = customHeaders) |> Async.RunSynchronously
+    
+    response.StatusCode |> should equal 200
+
+[<Test>]
+let ``XElement.RequestAsync includes default User-Agent header`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = XElement(XName.Get("test"))
+    let response = xml.RequestAsync(localServer.BaseAddress + "/echo") |> Async.RunSynchronously
+    
+    response.StatusCode |> should equal 200
+
+[<Test>]
+let ``XElement.RequestAsync preserves existing User-Agent when provided`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = XElement(XName.Get("test"))
+    let customHeaders = [UserAgent "AsyncAgent/1.0"]
+    let response = xml.RequestAsync(localServer.BaseAddress + "/echo", headers = customHeaders) |> Async.RunSynchronously
+    
+    response.StatusCode |> should equal 200
+
+[<Test>]
+let ``XElement with namespaces serializes correctly`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let ns = XNamespace.Get("http://example.com/test")
+    let xml = XElement(ns + "root", XAttribute(XNamespace.Xmlns + "test", ns.NamespaceName), "content")
+    let response = xml.Request(localServer.BaseAddress + "/echo")
+    
+    response.StatusCode |> should equal 200
+    match response.Body with
+    | Text bodyText -> bodyText |> should contain "xmlns:test=\"http://example.com/test\""
+    | Binary _ -> failwith "Expected text response, but got binary"
+
+[<Test>]
+let ``XElement serialization disables formatting`` () =
+    use localServer = startXmlHttpLocalServer()
+    System.Threading.Thread.Sleep(100)
+    
+    let xml = 
+        XElement(XName.Get("root"),
+            XElement(XName.Get("child1"), "value1"),
+            XElement(XName.Get("child2"), "value2"))
+    
+    let response = xml.Request(localServer.BaseAddress + "/echo")
+    
+    response.StatusCode |> should equal 200
+    // Should be compact without extra whitespace due to SaveOptions.DisableFormatting
+    match response.Body with
+    | Text bodyText -> bodyText |> should not' (contain "\n  <child1>")
+    | Binary _ -> failwith "Expected text response, but got binary"
\ No newline at end of file