Hello, i am having below issue

panic: assignment to entry in nil map

goroutine 1 [running]: net/textproto.MIMEHeader.Set(...) /usr/local/Cellar/go/1.17.5/libexec/src/net/textproto/header.go:22 net/http.Header.Set(...) /usr/local/Cellar/go/1.17.5/libexec/src/net/http/header.go:38 k8s.io/client-go/plugin/pkg/client/auth/exec.(*roundTripper).RoundTrip(0xc00052a1c8, 0xc000275400) /Users/twanc/go/pkg/mod/k8s.io/[email protected]/plugin/pkg/client/auth/exec/exec.go:310 +0x18d github.com/jpts/kubectl-execws/cmd.doExec(0xc0000f7d60) /Users/twanc/Tests/kubectl-execws/cmd/exec.go:155 +0x12c github.com/jpts/kubectl-execws/cmd.glob..func1(0x1aa1400, {0xc00008af80, 0x2, 0x4}) /Users/twanc/Tests/kubectl-execws/cmd/root.go:59 +0x2be github.com/spf13/cobra.(*Command).execute(0x1aa1400, {0xc0000200b0, 0x4, 0x4}) /Users/twanc/go/pkg/mod/github.com/spf13/[email protected]/command.go:860 +0x5f8 github.com/spf13/cobra.(*Command).ExecuteC(0x1aa1400) /Users/twanc/go/pkg/mod/github.com/spf13/[email protected]/command.go:974 +0x3bc github.com/spf13/cobra.(*Command).Execute(...) /Users/twanc/go/pkg/mod/github.com/spf13/[email protected]/command.go:902 github.com/jpts/kubectl-execws/cmd.Execute() /Users/twanc/Tests/kubectl-execws/cmd/root.go:69 +0x25 main.main() /Users/twanc/Tests/kubectl-execws/main.go:6 +0x17

Any ideas whats wrong? Thanks

I used this to test out a websocket tunnel and ran into an exception on GKE:

$ ./kubectl-execws -it busybox -- ls -lh /
panic: assignment to entry in nil map

goroutine 1 [running]:
net/textproto.MIMEHeader.Set(...)
    /usr/lib/google-golang/src/net/textproto/header.go:22
net/http.Header.Set(...)
    /usr/lib/google-golang/src/net/http/header.go:40
k8s.io/client-go/plugin/pkg/client/auth/exec.(*roundTripper).RoundTrip(0xc0002dc7b0, 0xc000276000)

Initializing the header struct fixes it.