From 9d546885a8858228bf7b510a18dd30831f6a034a Mon Sep 17 00:00:00 2001
From: Luca <37640802+lucapivato@users.noreply.github.com>
Date: Wed, 2 Jul 2025 11:00:56 +0200
Subject: [PATCH] Fixed StreamableHttpClientSessionTransport.cs for netstandard

Fixed exception 'The format of value 'application/json; charset=utf-8' is invalid

"application/json; charset=utf-8" is an invalid header.  the correct one is "application/json".
---
 .../Client/StreamableHttpClientSessionTransport.cs            | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ModelContextProtocol.Core/Client/StreamableHttpClientSessionTransport.cs b/src/ModelContextProtocol.Core/Client/StreamableHttpClientSessionTransport.cs
index 14df5c35..78217868 100644
--- a/src/ModelContextProtocol.Core/Client/StreamableHttpClientSessionTransport.cs
+++ b/src/ModelContextProtocol.Core/Client/StreamableHttpClientSessionTransport.cs
@@ -75,7 +75,7 @@ internal async Task<HttpResponseMessage> SendHttpRequestAsync(JsonRpcMessage mes
         using var content = new StringContent(
             JsonSerializer.Serialize(message, McpJsonUtilities.JsonContext.Default.JsonRpcMessage),
             Encoding.UTF8,
-            "application/json; charset=utf-8"
+            "application/json"
         );
 #endif
 
@@ -310,4 +310,4 @@ internal static void CopyAdditionalHeaders(
             }
         }
     }
-}
\ No newline at end of file
+}