Version 0.21.1

Added

• OpenTelemetry integration under lilya.contrib.opentelemetry:
  • Introduced OpenTelemetryMiddleware for automatic request tracing.
    • Creates one SERVER span per HTTP request.
    • Records standard HTTP attributes (method, path, status, client.address, url.query, etc.).
    • Captures exceptions and marks spans with StatusCode.ERROR.
    • Handles parent context extraction from inbound headers for trace propagation.
  • Added setup_tracing(config: OpenTelemetryConfig | None) helper.
    • Initializes a global TracerProvider with a BatchSpanProcessor.
    • Automatically selects between ConsoleSpanExporter, OTLP/gRPC, and OTLP/HTTP exporters.
    • Safe to call multiple times (idempotent).
  • Added OpenTelemetryConfig dataclass for configuration.
    • Supports fields:
      • service_name: logical name reported to telemetry backends.
      • exporter: "otlp" or "console".
      • otlp_endpoint: e.g. "http://localhost:4317" or "http://collector:4318".
      • otlp_insecure: disable TLS verification for gRPC exporters.
      • sampler: "parentbased_always_on", "always_on", or "always_off".
  • Added get_tracer_provider() utility to retrieve the active TracerProvider.
• Async testing utilities:
  • Introduced AsyncTestClient and create_async_client() to allow fully asynchronous testing of Lilya apps.
  • Both support full middleware stacks, including OpenTelemetryMiddleware.
  • Enables concurrent request tests and real async span creation with in-memory exporters.
• Contrib Shortcuts:
  • New abort function to raise HTTP exceptions.
  • New responses shorcuts including:
    • send_json(): send JSON responses with proper headers.
    • json_error(): send JSON error responses with status codes.
    • stream(): stream response content from async generators.
    • empty(): return empty 204 No Content responses.
    • redirect(): send HTTP redirects with proper status codes and headers.
    • forbidden(): send 403 Forbidden responses.
    • not_found(): send 404 Not Found responses.
    • unauthorized(): send 401 Unauthorized responses.

Changed

• redirect now is in lilya.contrib.responses.shortcuts.

Fixed

• send_file now correctly sets Content-Disposition headers for file downloads.
• Late binding in the make_response.