Undo some of the span abuse

Emby.Server.Implementations/ApplicationHost.cs

@@ -1676,7 +1676,7 @@ namespace Emby.Server.Implementations
                     LogErrorResponseBody = false,
                     LogErrors = logPing,
                     LogRequest = logPing,
-                    TimeoutMs = 30000,
+                    TimeoutMs = 5000,
                     BufferContent = false,
 
                     CancellationToken = cancellationToken

Emby.Server.Implementations/Emby.Server.Implementations.csproj

@@ -40,6 +40,7 @@
     <PackageReference Include="ServiceStack.Text.Core" Version="5.4.0" />
     <PackageReference Include="sharpcompress" Version="0.22.0" />
     <PackageReference Include="SQLitePCL.pretty.netstandard" Version="1.0.0" />
+    <PackageReference Include="System.Buffers" Version="4.5.0" />
     <PackageReference Include="UTF.Unknown" Version="1.0.0-beta1" />
   </ItemGroup>
 

Emby.Server.Implementations/SocketSharp/WebSocketSharpRequest.cs

@@ -273,11 +273,11 @@ namespace Emby.Server.Implementations.SocketSharp
 
         private static string GetQueryStringContentType(HttpRequest httpReq)
         {
-            string format = httpReq.Query["format"];
+            ReadOnlySpan<char> format = httpReq.Query["format"].ToString().AsSpan();
             if (format == null)
             {
                 const int formatMaxLength = 4;
-                string pi = httpReq.Path.ToString();
+                ReadOnlySpan<char> pi = httpReq.Path.ToString().AsSpan();
                 if (pi == null || pi.Length <= formatMaxLength)
                 {
                     return null;
@@ -285,7 +285,7 @@ namespace Emby.Server.Implementations.SocketSharp
 
                 if (pi[0] == '/')
                 {
-                    pi = pi.Substring(1);
+                    pi = pi.Slice(1);
                 }
 
                 format = LeftPart(pi, '/');
@@ -296,11 +296,11 @@ namespace Emby.Server.Implementations.SocketSharp
             }
 
             format = LeftPart(format, '.');
-            if (format.ToLower().Contains("json"))
+            if (format.Contains("json".AsSpan(), StringComparison.OrdinalIgnoreCase))
             {
                 return "application/json";
             }
-            else if (format.ToLower().Contains("xml"))
+            else if (format.Contains("xml".AsSpan(), StringComparison.OrdinalIgnoreCase))
             {
                 return "application/xml";
             }
@@ -308,25 +308,14 @@ namespace Emby.Server.Implementations.SocketSharp
             return null;
         }
 
-        public static string LeftPart(string strVal, char needle)
+        public static ReadOnlySpan<char> LeftPart(ReadOnlySpan<char> strVal, char needle)
         {
             if (strVal == null)
             {
                 return null;
             }
 
-            var pos = strVal.IndexOf(needle.ToString(), StringComparison.Ordinal);
-            return pos == -1 ? strVal : strVal.Substring(0, pos);
-        }
-
-        public static ReadOnlySpan<string> LeftPart(ReadOnlySpan<string> strVal, char needle)
-        {
-            if (strVal == null)
-            {
-                return null;
-            }
-
-            var pos = strVal.IndexOf(needle.ToString());
+            var pos = strVal.IndexOf(needle);
             return pos == -1 ? strVal : strVal.Slice(0, pos);
         }