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net/http: net/http.(*http2pipe).Write: invalid memory address or nil pointer dereference #13932
Using latest code in the master branch (771da53)
Possibly this occurred just after numerous errors returned by http.NewRequest or client.Do:
I have a theory about this one, but still investigating.
Which HTTP/2 server are you running this against? Is it Go or nginx or Apache or .... ?
My theory involves a specific frame order arriving. I know there's a bug in the client to cause it to crash (your stacktrace above), but I'm not sure whether there's also a bug in the Go server.