public async Task InvokeAsync(HttpContext context)
{
cachingManager.Start(context);
AppendAuthHeaders(context);
context.Response.OnStarting(_ =>
{
var httpContext = (HttpContext)_;
cachingManager.Finish(httpContext);
if (httpContext.Response.Headers.TryGetString(HeaderNames.ETag, out var etag))
{
if (!cachingOptions.StrongETag && !ETagUtils.IsWeakEtag(etag))
{
httpContext.Response.Headers[HeaderNames.ETag] = ETagUtils.ToWeakEtag(etag);
}
}
return(Task.CompletedTask);
}, context);
await next(context);
}
private static bool IsCacheable(HttpContext httpContext, string etag)
{
if (!HttpMethods.IsGet(httpContext.Request.Method) || httpContext.Response.StatusCode != 200)
{
return(false);
}
if (!httpContext.Request.Headers.TryGetString(HeaderNames.IfNoneMatch, out var noneMatchValue))
{
return(false);
}
return(ETagUtils.IsSameEtag(noneMatchValue, etag));
}