AltSvcHeaderValue.cs

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using System.Globalization;
using System.Text;
 
namespace System.Net.Http.Headers;
 
internal sealed class AltSvcHeaderValue
{
    public static AltSvcHeaderValue Clear { get; } = new AltSvcHeaderValue("clear", null, 0, TimeSpan.Zero, persist: false);
 
 
    public string AlpnProtocolName { get; }
 
    public string Host { get; }
 
    public int Port { get; }
 
    public TimeSpan MaxAge { get; }
 
    public bool Persist { get; }
 
    public AltSvcHeaderValue(string alpnProtocolName, string host, int port, TimeSpan maxAge, bool persist)
    {
        AlpnProtocolName = alpnProtocolName;
        Host = host;
        Port = port;
        MaxAge = maxAge;
        Persist = persist;
    }
 
    public override string ToString()
    {
        StringBuilder stringBuilder = System.Text.StringBuilderCache.Acquire(AlpnProtocolName.Length + (Host?.Length ?? 0) + 64);
        stringBuilder.Append(AlpnProtocolName);
        stringBuilder.Append("=\"");
        if (Host != null)
        {
            stringBuilder.Append(Host);
        }
        stringBuilder.Append(':');
        stringBuilder.Append((uint)Port);
        stringBuilder.Append('"');
        if (MaxAge != TimeSpan.FromTicks(864000000000L))
        {
            StringBuilder stringBuilder2 = stringBuilder;
            IFormatProvider invariantCulture = CultureInfo.InvariantCulture;
            StringBuilder.AppendInterpolatedStringHandler handler = new StringBuilder.AppendInterpolatedStringHandler(5, 1, stringBuilder2, invariantCulture);
            handler.AppendLiteral("; ma=");
            handler.AppendFormatted(MaxAge.Ticks / 10000000);
            stringBuilder2.Append(invariantCulture, ref handler);
        }
        if (Persist)
        {
            stringBuilder.Append("; persist=1");
        }
        return System.Text.StringBuilderCache.GetStringAndRelease(stringBuilder);
    }
}