Remove format from connect and only use it in /send

samples/ChatSample/Views/Home/Index.cshtml

@@ -27,7 +27,7 @@ connection.start();
 document.getElementById('sendmessage').addEventListener('submit', event => {
     let data = document.getElementById('new-message').value;
 
-    connection.invoke('Send', data, 'json').catch(err => {
+    connection.invoke('Send', data).catch(err => {
         var child = document.createElement('li');
         child.style.color = 'red';
         child.innerText = err;

src/Microsoft.AspNetCore.SignalR.Redis/RedisHubLifetimeManager.cs

@@ -278,7 +278,7 @@ namespace Microsoft.AspNetCore.SignalR.Redis
         private async Task WriteAsync(Connection connection, byte[] data)
         {
             var buffer = ReadableBuffer.Create(data).Preserve();
-            var message = new Message(buffer, connection.Metadata.Format, endOfMessage: true);
+            var message = new Message(buffer, Format.Text, endOfMessage: true);
 
             while (await connection.Transport.Output.WaitToWriteAsync())
             {

src/Microsoft.AspNetCore.SignalR/DefaultHubLifetimeManager.cs

@@ -130,7 +130,7 @@ namespace Microsoft.AspNetCore.SignalR
             await invocationAdapter.WriteMessageAsync(invocation, stream);
 
             var buffer = ReadableBuffer.Create(stream.ToArray()).Preserve();
-            var message = new Message(buffer, connection.Metadata.Format, endOfMessage: true);
+            var message = new Message(buffer, Format.Text, endOfMessage: true);
 
             while (await connection.Transport.Output.WaitToWriteAsync())
             {

src/Microsoft.AspNetCore.SignalR/HubEndPoint.cs

@@ -191,7 +191,7 @@ namespace Microsoft.AspNetCore.SignalR
                     await invocationAdapter.WriteMessageAsync(result, outStream);
 
                     var buffer = ReadableBuffer.Create(outStream.ToArray()).Preserve();
-                    var outMessage = new Message(buffer, connection.Metadata.Format, endOfMessage: true);
+                    var outMessage = new Message(buffer, Format.Text, endOfMessage: true);
 
                     while (await connection.Transport.Output.WaitToWriteAsync())
                     {

src/Microsoft.AspNetCore.Sockets/ConnectionMetadata.cs

@@ -10,8 +10,6 @@ namespace Microsoft.AspNetCore.Sockets
     {
         private ConcurrentDictionary<object, object> _metadata = new ConcurrentDictionary<object, object>();
 
-        public Format Format { get; set; } = Format.Text;
-
         public object this[object key]
         {
             get

src/Microsoft.AspNetCore.Sockets/HttpConnectionDispatcher.cs

@@ -153,7 +153,6 @@ namespace Microsoft.AspNetCore.Sockets
         {
             state.Connection.User = context.User;
             state.Connection.Metadata["transport"] = transport;
-            state.Connection.Metadata.Format = format;
 
             // TODO: this is wrong. + how does the user add their own metadata based on HttpContext
             var formatType = (string)context.Request.Query["formatType"];