Fixes #449

RELEASE_NOTES.md

@@ -1,6 +1,10 @@
 Release Notes
 =============
 
+## 5.0.0-rc-3
+
+- Added `ReadBodyBufferedFromRequestAsync` extension method to buffer and read a the request body and make subsequent reads possible (see [#449](https://github.com/giraffe-fsharp/Giraffe/issues/449))
+
 ## 5.0.0-rc-2
 
 - Fixed pre-conditions validation issue (see [#424](https://github.com/giraffe-fsharp/Giraffe/issues/424))

src/Giraffe/ModelBinding.fs

@@ -365,6 +365,25 @@ type HttpContext with
             return! reader.ReadToEndAsync()
         }
 
+    /// <summary>
+    /// Reads the entire body of the <see cref="Microsoft.AspNetCore.Http.HttpRequest"/> asynchronously and returns it as a <see cref="System.String"/> value.
+    /// This method buffers the response and makes subsequent reads possible.
+    /// </summary>
+    /// <returns>Returns the contents of the request body as a <see cref="System.Threading.Tasks.Task{System.String}"/>.</returns>
+    member this.ReadBodyBufferedFromRequestAsync() =
+        task {
+            this.Request.EnableBuffering()
+            use reader =
+                new StreamReader(
+                    this.Request.Body,
+                    encoding = Encoding.UTF8,
+                    detectEncodingFromByteOrderMarks = false,
+                    leaveOpen = true)
+            let! body = reader.ReadToEndAsync()
+            this.Request.Body.Position <- 0L
+            return body
+        }
+
     /// <summary>
     /// Uses the <see cref="IJsonSerializer"/> to deserializes the entire body of the <see cref="Microsoft.AspNetCore.Http.HttpRequest"/> asynchronously into an object of type 'T.
     /// </summary>