http header cannot assign to a nil map

[alleeclark]

Was using this to perform testing on a target where I needed to pass an AttackHeader. When I went to get the report of the attack, it returned no attack with that id could be found. I noticed the server panic'd on my systemd unit and triggered a restart.

Wrote a test to verify that it was related to the headers.

=== RUN   TestNewAttackOptsFromAttackParams_WithHeaders/with-headers
--- FAIL: TestNewAttackOptsFromAttackParams_WithHeaders (0.00s)
    --- FAIL: TestNewAttackOptsFromAttackParams_WithHeaders/with-headers (0.00s)
panic: assignment to entry in nil map [recovered]
        panic: assignment to entry in nil map

goroutine 28 [running]:
testing.tRunner.func1.1(0x8f2900, 0x9e45a0)
        /snap/go/6274/src/testing/testing.go:988 +0x452
testing.tRunner.func1(0xc0000df560)
        /snap/go/6274/src/testing/testing.go:991 +0x600
panic(0x8f2900, 0x9e45a0)
        /snap/go/6274/src/runtime/panic.go:975 +0x3e3
net/textproto.MIMEHeader.Add(...)
        /snap/go/6274/src/net/textproto/header.go:15
net/http.Header.Add(...)
        /snap/go/6274/src/net/http/header.go:28
vegeta-server/pkg/vegeta.NewAttackOptsFromAttackParams(0x95d57d, 0xc, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
        /home/allee/go/src/github.com/vegeta-server/pkg/vegeta/options.go:56 +0x2b6
vegeta-server/pkg/vegeta.TestNewAttackOptsFromAttackParams_WithHeaders.func1(0xc0000df560)
        /home/allee/go/src/github.com/vegeta-server/pkg/vegeta/options_test.go:58 +0x106
testing.tRunner(0xc0000df560, 0xc0001245c0)
        /snap/go/6274/src/testing/testing.go:1039 +0x1ec
created by testing.(*T).Run
        /snap/go/6274/src/testing/testing.go:1090 +0x701
FAIL    vegeta-server/pkg/vegeta        0.017s
FAIL
make: *** [Makefile:32: test] Error 1```

Made changes to options. Ran make test and passed

[nitishm]

Thanks !!