public async Task Get()
{
var result = await _healthCheckService.CheckHealthAsync(_healthCheckOptions.Predicate, HttpContext.RequestAborted);
// Map status to response code - this is customizable via options.
if (!_healthCheckOptions.ResultStatusCodes.TryGetValue(result.Status, out var statusCode))
{
var message =
$"No status code mapping found for {nameof(HealthStatus)} value: {result.Status}." +
$"{nameof(HealthCheckOptions)}.{nameof(HealthCheckOptions.ResultStatusCodes)} must contain" +
$"an entry for {result.Status}.";
throw new InvalidOperationException(message);
}
HttpContext.Response.StatusCode = statusCode;
if (!_healthCheckOptions.AllowCachingResponses)
{
var headers = HttpContext.Response.Headers;
headers[HeaderNames.CacheControl] = "no-store, no-cache";
headers[HeaderNames.Pragma] = "no-cache";
headers[HeaderNames.Expires] = "Thu, 01 Jan 1970 00:00:00 GMT";
}
if (_healthCheckOptions.ResponseWriter != null)
{
await _healthCheckOptions.ResponseWriter(HttpContext, result);
}
}
/// <summary>
/// Processes a request.
/// </summary>
/// <param name="httpContext"></param>
/// <returns></returns>
public async Task InvokeAsync(HttpContext httpContext)
{
if (httpContext == null)
{
throw new ArgumentNullException(nameof(httpContext));
}
// Get results
var result = await _healthCheckService.CheckHealthAsync(_healthCheckOptions.Predicate, httpContext.RequestAborted);
// Map status to response code - this is customizable via options.
if (!_healthCheckOptions.ResultStatusCodes.TryGetValue(result.Status, out var statusCode))
{
var message =
$"No status code mapping found for {nameof(HealthStatus)} value: {result.Status}." +
$"{nameof(HealthCheckOptions)}.{nameof(HealthCheckOptions.ResultStatusCodes)} must contain" +
$"an entry for {result.Status}.";
throw new InvalidOperationException(message);
}
httpContext.Response.StatusCode = statusCode;
if (!_healthCheckOptions.AllowCachingResponses)
{
// Similar to: https://github.com/aspnet/Security/blob/7b6c9cf0eeb149f2142dedd55a17430e7831ea99/src/Microsoft.AspNetCore.Authentication.Cookies/CookieAuthenticationHandler.cs#L377-L379
var headers = httpContext.Response.Headers;
headers.CacheControl = "no-store, no-cache";
headers.Pragma = "no-cache";
headers.Expires = "Thu, 01 Jan 1970 00:00:00 GMT";
}
if (_healthCheckOptions.ResponseWriter != null)
{
await _healthCheckOptions.ResponseWriter(httpContext, result);
}
}