HttpResponse.PushPromise Method (String, String, NameValueCollection)
This API is to support applications sending push promises to HTTP 2.0 clients. You can find more details regarding to Http2 server push at HTTP/2 Specification Section 8.2: Server Push.
Assembly: System.Web (in System.Web.dll)
The URL of the push request. It should be the virtual path of the relative resource that the server wants to push to the client.
Http request method that would be used by the push request.
Http request header that would be used by the push request.
PushPromise is non-deterministic and applications shouldn't have logic that depends on it. Its only purpose is performance advantage in some cases. There are many conditions (protocol and implementation) that may cause to ignore the push requests completely. The expectation is based on fire-and-forget.
Available since 4.6