Health checks and networking

Q: How do I check if a TCP port is open in C#?

Call Pineapple.Health.Check.IsAlive(host, port). It attempts a TCP connection and returns true if it succeeds.

Q: How do I enable Brotli decompression for HttpClient?

The simplest option is new HttpClientHandler { AutomaticDecompression = DecompressionMethods.All }. If you build HttpClient pipelines with IHttpClientFactory and DelegatingHandlers, add Pineapple’s handler with services.AddHttpClient("api").AddBrotliCompression(services).

`Health.Check`

Pineapple.Health.Check provides quick yes/no probes for dependencies — useful in startup checks, CLI tools, and test fixtures.

using Pineapple.Health;

bool dbPortOpen = Check.IsAlive("sql.contoso.internal", 1433);       // TCP connect
bool siteUp     = Check.IsUrlAvailable("https://contoso.com/health", timeoutInMs: 5_000); // HTTP 200
bool running    = Check.IsRunning("dotnet");                          // process name contains "dotnet"
bool apiUp      = new Uri("https://api.contoso.com/ping").IsUrlAvailable(2_000);

All probes return false instead of throwing when the target is unreachable. For ASP.NET Core readiness and liveness endpoints, use these inside a IHealthCheck.

`BrotliCompressionHandler`

A DelegatingHandler that decompresses Content-Encoding: br responses with System.IO.Compression.BrotliStream, for IHttpClientFactory pipelines.

using Pineapple.Networking;

builder.Services
    .AddHttpClient("catalog", c => c.BaseAddress = new Uri("https://catalog.contoso.com"))
    .AddBrotliCompression(builder.Services);

Remember to send Accept-Encoding: br on requests. If you control the primary handler, HttpClientHandler.AutomaticDecompression = DecompressionMethods.Brotli achieves the same thing without a delegating handler.

Questions about health checks and networking

How do I check if a TCP port is open in C#?

Call Pineapple.Health.Check.IsAlive(host, port). It attempts a TCP connection and returns true if it succeeds.

How do I enable Brotli decompression for HttpClient?

The simplest option is new HttpClientHandler { AutomaticDecompression = DecompressionMethods.All }. If you build HttpClient pipelines with IHttpClientFactory and DelegatingHandlers, add Pineapple’s handler with services.AddHttpClient("api").AddBrotliCompression(services).