TLSEventsHandler wasn't getting added

This fixes testStressGetHttpsSSLError without TS

Author: adam-fowler

Sources/AsyncHTTPClient/ConnectionPool.swift

@@ -419,11 +419,8 @@ final class ConnectionPool {
             }
 
             return channel.flatMap { channel -> EventLoopFuture<ConnectionPool.Connection> in
-                if self.requiresSSLHandler(on: eventLoop) {
-                    channel.pipeline.addSSLHandlerIfNeeded(for: self.key, tlsConfiguration: self.configuration.tlsConfiguration, handshakePromise: handshakePromise)
-                } else {
-                    handshakePromise.succeed(())
-                }
+                    
+                channel.pipeline.addSSLHandlerIfNeeded(for: self.key, tlsConfiguration: self.configuration.tlsConfiguration, addSSLClient: self.requiresSSLHandler(on: eventLoop), handshakePromise: handshakePromise)
                 return handshakePromise.futureResult.flatMap {
                    channel.pipeline.addHTTPClientHandlers(leftOverBytesStrategy: .forwardBytes)
                 }.map {

Sources/AsyncHTTPClient/HTTPClient.swift

@@ -681,19 +681,24 @@ extension ChannelPipeline {
         return addHandlers([encoder, decoder, handler])
     }
 
-    func addSSLHandlerIfNeeded(for key: ConnectionPool.Key, tlsConfiguration: TLSConfiguration?, handshakePromise: EventLoopPromise<Void>) {
+    func addSSLHandlerIfNeeded(for key: ConnectionPool.Key, tlsConfiguration: TLSConfiguration?, addSSLClient: Bool, handshakePromise: EventLoopPromise<Void>) {
         guard key.scheme == .https else {
             handshakePromise.succeed(())
             return
         }
 
         do {
-            let tlsConfiguration = tlsConfiguration ?? TLSConfiguration.forClient()
-            let context = try NIOSSLContext(configuration: tlsConfiguration)
-            let handlers: [ChannelHandler] = [
-                try NIOSSLClientHandler(context: context, serverHostname: key.host.isIPAddress ? nil : key.host),
-                TLSEventsHandler(completionPromise: handshakePromise),
-            ]
+            let handlers: [ChannelHandler]
+            if addSSLClient {
+                let tlsConfiguration = tlsConfiguration ?? TLSConfiguration.forClient()
+                let context = try NIOSSLContext(configuration: tlsConfiguration)
+                handlers = [
+                    try NIOSSLClientHandler(context: context, serverHostname: key.host.isIPAddress ? nil : key.host),
+                    TLSEventsHandler(completionPromise: handshakePromise)
+                ]
+            } else {
+                handlers = [TLSEventsHandler(completionPromise: handshakePromise)]
+            }
             self.addHandlers(handlers).cascadeFailure(to: handshakePromise)
         } catch {
             handshakePromise.fail(error)