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| package main | |
| import ( | |
| "fmt" | |
| "net/http" | |
| "net/url" | |
| ) | |
| func request(url_ string) { | |
| req, err := http.NewRequest("HEAD", url_, nil) | |
| if err != nil { | |
| panic(err) | |
| } | |
| res, err := http.DefaultClient.Do(req) | |
| if err != nil { | |
| panic(err) | |
| } | |
| res.Body.Close() | |
| fmt.Println(url_, res.Status) | |
| } | |
| func main() { | |
| okURL, err := url.Parse("https://www.gkogan.co/blog/dont-design-emails/") | |
| if err != nil { | |
| panic(err) | |
| } | |
| badURL, err := url.Parse("https://www.gkogan.co/blog/dont-design-emails") | |
| if err != nil { | |
| panic(err) | |
| } | |
| fmt.Printf("OK URL:\n%#v\n\n", okURL) | |
| fmt.Printf("Bad URL:\n%#v\n\n", badURL) | |
| request(okURL.String()) | |
| request(badURL.String()) | |
| } |
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| $ go run h2nilderef.go master | |
| OK URL: | |
| &url.URL{Scheme:"https", Opaque:"", User:(*url.Userinfo)(nil), Host:"www.gkogan.co", Path:"/blog/dont-design-emails/", RawPath:"", ForceQuery:false, RawQuery:"", Fragment:""} | |
| Bad URL: | |
| &url.URL{Scheme:"https", Opaque:"", User:(*url.Userinfo)(nil), Host:"www.gkogan.co", Path:"/blog/dont-design-emails", RawPath:"", ForceQuery:false, RawQuery:"", Fragment:""} | |
| https://www.gkogan.co/blog/dont-design-emails/ 200 OK | |
| panic: runtime error: invalid memory address or nil pointer dereference | |
| [signal SIGSEGV: segmentation violation code=0x1 addr=0x30 pc=0x5bafc0] | |
| goroutine 35 [running]: | |
| net/http.(*http2pipe).Write(0xc4200ba168, 0xc4204ca000, 0x29, 0x87, 0x0, 0x0, 0x0) | |
| /opt/go/src/net/http/h2_bundle.go:3661 +0x100 | |
| net/http.(*http2clientConnReadLoop).processData(0xc4204c9fb0, 0xc42007ce70, 0xc42007ce70, 0x0) | |
| /opt/go/src/net/http/h2_bundle.go:8259 +0x2ac | |
| net/http.(*http2clientConnReadLoop).run(0xc4204c9fb0, 0x67ec80, 0xc420461fb0) | |
| /opt/go/src/net/http/h2_bundle.go:7896 +0x54f | |
| net/http.(*http2ClientConn).readLoop(0xc42007eb60) | |
| /opt/go/src/net/http/h2_bundle.go:7788 +0x9d | |
| created by net/http.(*http2Transport).newClientConn | |
| /opt/go/src/net/http/h2_bundle.go:7053 +0x6b9 | |
| panic: runtime error: invalid memory address or nil pointer dereference | |
| [signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x5df730] | |
| goroutine 1 [running]: | |
| net/http.(*http2ClientConn).RoundTrip.func1(0x0, 0x0, 0x0, 0x0, 0x18, 0x0) | |
| /opt/go/src/net/http/h2_bundle.go:7324 +0x240 | |
| net/http.(*http2ClientConn).RoundTrip(0xc42007eb60, 0xc420122000, 0x0, 0x0, 0x0) | |
| /opt/go/src/net/http/h2_bundle.go:7356 +0xe80 | |
| net/http.(*http2Transport).RoundTripOpt(0xc420084230, 0xc420122000, 0xc42014c100, 0xc420053848, 0x40a860, 0xffffffffffffffff) | |
| /opt/go/src/net/http/h2_bundle.go:6858 +0x145 | |
| net/http.(*http2Transport).RoundTrip(0xc420084230, 0xc420122000, 0x592601, 0xc420016120, 0xc420053a78) | |
| /opt/go/src/net/http/h2_bundle.go:6820 +0x3a | |
| net/http.http2noDialH2RoundTripper.RoundTrip(0xc420084230, 0xc420122000, 0xc4203bc360, 0x5, 0xc420098aa8) | |
| /opt/go/src/net/http/h2_bundle.go:990 +0x39 | |
| net/http.(*Transport).RoundTrip(0x7b6420, 0xc420122000, 0x7b6420, 0x0, 0x0) | |
| /opt/go/src/net/http/transport.go:371 +0xd47 | |
| net/http.send(0xc420122000, 0x784c20, 0x7b6420, 0x0, 0x0, 0x0, 0xc4202400c0, 0x7d9738, 0x7848e0, 0x2) | |
| /opt/go/src/net/http/client.go:249 +0x1a9 | |
| net/http.(*Client).send(0x7b9ee0, 0xc420122000, 0x0, 0x0, 0x0, 0xc4202400c0, 0x1, 0x2, 0x0) | |
| /opt/go/src/net/http/client.go:173 +0xfd | |
| net/http.(*Client).Do(0x7b9ee0, 0xc420102200, 0xc4203bc360, 0x2d, 0x0) | |
| /opt/go/src/net/http/client.go:602 +0x28d | |
| main.request(0xc4203bc360, 0x2d) | |
| /home/cgt/dev/go/src/h2nilderef/h2nilderef.go:14 +0xaf | |
| main.main() | |
| /home/cgt/dev/go/src/h2nilderef/h2nilderef.go:37 +0x1a1 | |
| exit status 2 | |
| $ go run h2nilderef.go 1 master | |
| OK URL: | |
| &url.URL{Scheme:"https", Opaque:"", User:(*url.Userinfo)(nil), Host:"www.gkogan.co", Path:"/blog/dont-design-emails/", RawPath:"", ForceQuery:false, RawQuery:"", Fragment:""} | |
| Bad URL: | |
| &url.URL{Scheme:"https", Opaque:"", User:(*url.Userinfo)(nil), Host:"www.gkogan.co", Path:"/blog/dont-design-emails", RawPath:"", ForceQuery:false, RawQuery:"", Fragment:""} | |
| https://www.gkogan.co/blog/dont-design-emails/ 200 OK | |
| panic: runtime error: invalid memory address or nil pointer dereference | |
| [signal SIGSEGV: segmentation violation code=0x1 addr=0x30 pc=0x5bafc0] | |
| goroutine 35 [running]: | |
| net/http.(*http2pipe).Write(0xc4203962a8, 0xc4203f8000, 0x29, 0x87, 0x0, 0x0, 0x0) | |
| /opt/go/src/net/http/h2_bundle.go:3661 +0x100 | |
| net/http.(*http2clientConnReadLoop).processData(0xc4203f7fb0, 0xc42049a360, 0xc42049a360, 0x0) | |
| /opt/go/src/net/http/h2_bundle.go:8259 +0x2ac | |
| net/http.(*http2clientConnReadLoop).run(0xc4203f7fb0, 0x67ec80, 0xc4204967b0) | |
| /opt/go/src/net/http/h2_bundle.go:7896 +0x54f | |
| net/http.(*http2ClientConn).readLoop(0xc42007eb60) | |
| /opt/go/src/net/http/h2_bundle.go:7788 +0x9d | |
| created by net/http.(*http2Transport).newClientConn | |
| /opt/go/src/net/http/h2_bundle.go:7053 +0x6b9 | |
| exit status 2 |
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