diff --git a/src/sockets/client.jl b/src/sockets/client.jl
index 158e22d..085cb27 100644
--- a/src/sockets/client.jl
+++ b/src/sockets/client.jl
@@ -138,6 +138,7 @@ function c_increment_read_window_task(channel_task, arg, status)
         if status == Int(AWS_TASK_STATUS_RUN_READY)
             socket.window_size += arg.increment
             slotobj = unsafe_load(socket.slot)
+            # TODO: check return value of aws_channel_slot_increment_read_window
             aws_channel_slot_increment_read_window(socket.slot, arg.increment)
             put!(socket.ch, :read_window_incremented)
             socket.debug && @info "[$(_id(socket))]: c_increment_read_window_task: incremented read window by $(arg.increment) bytes"
@@ -268,14 +269,13 @@ end
 const SETUP_CALLBACK = Ref{Ptr{Cvoid}}(C_NULL)
 
 function c_shutdown_callback(bootstrap, error_code, channel, socket)
-    GC.@preserve socket begin
-        socket.debug && @warn "c_shutdown_callback"
-        close(socket.ch)
-        close(socket.readbuf)
-        close(socket.writebuf)
-        socket.channel = C_NULL
-        socket.slot = C_NULL
-    end
+    socket.debug && @warn "c_shutdown_callback"
+    close(socket.ch)
+    close(socket.readbuf)
+    close(socket.writebuf)
+    socket.channel = C_NULL
+    socket.slot = C_NULL
+    aws_channel_destroy(channel)
     return
 end
 
diff --git a/test/runtests.jl b/test/runtests.jl
index f56f227..93aa5ed 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -21,12 +21,33 @@ data = String(read(sock, 100))
 close(sock)
 
 println("testing tls upgrade")
+Sockets.set_log_level!(7)
 sock = Sockets.Client("www.google.com", 443; tls=false, buffer_capacity=2^12, debug=true)
 AwsIO.Sockets.tlsupgrade!(sock; ssl_alpn_list="http/1.1")
 write(sock, "GET / HTTP/1.1\r\nHost: www.google.com\r\n\r\n")
 sleep(0.1)
-data = String(read(sock, 100))
+data = String(read(sock, 1000))
 @test startswith(data, "HTTP/1.1 200 OK")
+data = String(read(sock, 1000))
+data = String(read(sock, 1000))
+data = String(read(sock, 1000))
+data = String(read(sock, 1000))
 close(sock)
 
 end
+
+
+
+# using Test, AwsIO
+# import AwsIO: AwsIO, Sockets
+# println("testing tls upgrade")
+# Sockets.set_log_level!(4)
+# sock = Sockets.Client("www.google.com", 443; tls=false, buffer_capacity=2^12, debug=true)
+# AwsIO.Sockets.tlsupgrade!(sock; ssl_alpn_list="http/1.1")
+# write(sock, "GET / HTTP/1.1\r\nHost: www.google.com\r\n\r\n")
+# sleep(0.1)
+# data = String(read(sock, 1000))
+# data = String(read(sock, 1000))
+# data = String(read(sock, 1000))
+# data = String(read(sock, 1000))
+# data = String(read(sock, 1000))