Crash on nil req.Header in http.get() in Twitter example

[ijt]

$ cd goauth/example
$ ./example
2011/05/29 22:55:59 web.go serving 0.0.0.0:7177
2011/05/29 22:56:10 GET /
2011/05/29 22:56:10 GET /favicon.ico
2011/05/29 22:56:18 GET /signin/twitter
2011/05/29 22:56:18 Handler crashed with error runtime error: lookup in nil map
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/runtime/proc.c 1041
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/runtime/runtime.c 116
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/runtime/hashmap.c 818
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/net/textproto/header.go 15
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/http/header.go 15
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/github.com/ijt/goauth/http.go 22
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/github.com/ijt/goauth/oauthconsumer.go 91
2011/05/29 22:56:18 /Users/issactrotts/repos/goauth/example/example.go 62
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/reflect/value.go 583
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/reflect/value.go 433
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/github.com/hoisie/web.go/web.go 273
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/github.com/hoisie/web.go/web.go 376
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/github.com/hoisie/web.go/web.go 249
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/http/server.go 728
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/http/server.go 499
2011/05/29 22:56:18 /Users/issactrotts/repos/go/src/pkg/runtime/proc.c 178