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Please backport #2077 to 5.1.x #2479
Hi @ema, I volunteered to be the bad guy and close this issue. As mentioned on the website  the 5.1 series is "retired" and superseded by 5.2 and we are not going to support 5.1 unless someone is willing to sponsor it. For example, 4.1 is maintained and released by Varnish Software and UPLEX also contributes back-ports.