shouldAllowUpgrade(upgradeResponse:)

Gives the receiving upgrader the chance to deny the upgrade based on the upgrade HTTP response.

func shouldAllowUpgrade(upgradeResponse: HTTPResponseHead) -> Bool

Mangled symbol

s8NIOHTTP134NIOTypedHTTPClientProtocolUpgraderP18shouldAllowUpgrade15upgradeResponseSbAA16HTTPResponseHeadV_tFWhat are these?

FNV24: [1J2LK]

Other requirements

var requiredUpgradeHeaders: [String]
All the header fields the protocol requires in the request to successfully upgrade. These header fields will be added to the outbound request’s “Connection” header field. It is the responsibility of the custom headers call to actually add these required headers.
var supportedProtocol: String
The protocol this upgrader knows how to support.
func addCustom(upgradeRequestHeaders: inout HTTPHeaders)
Additional headers to be added to the request, beyond the “Upgrade” and “Connection” headers.
func upgrade(channel: Channel, upgradeResponse: HTTPResponseHead) -> EventLoopFuture<UpgradeResult>
Called when the upgrade response has been flushed. At this time it is safe to mutate the channel pipeline to add whatever channel handlers are required. Until the returned EventLoopFuture succeeds, all received data will be buffered.