using Microsoft.AspNetCore.ResponseCompression;
using Microsoft.Net.Http.Headers;

var builder = WebApplication.CreateBuilder(args);

// 啟用響應(yīng)壓縮中間件
builder.Services.AddResponseCompression(options =>
{
    options.EnableForHttps = true; // 啟用HTTPS壓縮（需謹(jǐn)慎?。?
});

var app = builder.Build();

// 在管道中啟用中間件（必須在其他中間件之前）
app.UseResponseCompression();

app.Run(async context =>
{
    var acceptEncoding = context.Request.Headers[HeaderNames.AcceptEncoding];
    
    // 根據(jù)客戶端支持的編碼格式設(shè)置Vary頭
    if (!StringValues.IsNullOrEmpty(acceptEncoding))
    {
        context.Response.Headers.Append(HeaderNames.Vary, HeaderNames.AcceptEncoding);
    }

    context.Response.ContentType = "text/plain";
    await context.Response.WriteAsync(new string('A', 1000000)); // 1MB的文本
});

builder.Services.AddResponseCompression(options =>
{
    options.EnableForHttps = true;
    options.Providers.Add<GzipCompressionProvider>(); // 添加Gzip壓縮
});

public class CustomCompressionProvider : ICompressionProvider
{
    public string EncodingName => "mycustomcompression"; // 自定義編碼名
    public bool SupportsFlush => true;

    public Stream CreateStream(Stream outputStream)
    {
        // 返回自定義壓縮流包裝器
        return new MyCustomCompressor(outputStream);
    }
}

// 注冊(cè)自定義提供程序
builder.Services.AddResponseCompression(options =>
{
    options.Providers.Add<CustomCompressionProvider>();
});

builder.Services.AddResponseCompression(options =>
{
    options.MimeTypes = new[] { "image/svg+xml" }; // 添加需要壓縮的MIME類型
});

builder.Services.AddResponseCompression(options =>
{
    options.EnableForHttps = false; // 默認(rèn)禁用HTTPS壓縮
});

# 使用Firefox開(kāi)發(fā)者工具
1. 打開(kāi)網(wǎng)絡(luò)面板（Network）
2. 右鍵請(qǐng)求 -> "Edit and Resend"
3. 添加請(qǐng)求頭：Accept-Encoding: br
4. 檢查響應(yīng)頭是否包含Content-Encoding: br

// 安裝NuGet包：AspNetCore.Diagnostics.HealthChecks
builder.Services.AddResponseCompression(options =>
{
    options.EnableForHttps = true;
});

app.UseResponseCompression();
app.UseHealthChecks("/health"); // 添加健康檢查端點(diǎn)

// 啟用靜態(tài)文件壓縮
app.UseStaticFiles(new StaticFileOptions
{
    OnPrepareResponse = ctx =>
    {
        if (ctx.Context.Request.Headers["Accept-Encoding"].Contains("gzip"))
        {
            ctx.Context.Response.Headers["Content-Encoding"] = "gzip";
        }
    }
});

app.Run(async context =>
{
    if (context.Request.Headers["Accept-Encoding"].Contains("br"))
    {
        context.Response.Headers["Content-Encoding"] = "br";
    }
    await context.Response.WriteAsync("Dynamic content");
});

app.Use(async (context, next) =>
{
    var tenant = context.Request.Headers["X-Tenant"];
    if (tenant == "premium")
    {
        context.Items["CompressionLevel"] = CompressionLevel.Optimal; // 高質(zhì)量壓縮
    }
    else
    {
        context.Items["CompressionLevel"] = CompressionLevel.Fastest; // 快速壓縮
    }
    await next();
});