英文:
Go - runtime error: invalid memory address or nil pointer dereference
问题
我正在尝试使用Go语言创建一个代理服务器，该服务器可以修改API请求的主体中的某些值。然而，当发送请求时，会出现以下恐慌错误，并且请求失败：
2015/05/03 14:17:52 http: panic serving 192.168.1.139:42818: runtime error: invalid memory address or nil pointer dereference
goroutine 72 [running]:
net/http.func·011()
/usr/lib/go/src/pkg/net/http/server.go:1100 +0xb1
runtime.panic(0x8258ee0, 0x83b3733)
/usr/lib/go/src/pkg/runtime/panic.c:248 +0x176
main.viewResponse(0x0, 0x1861b470, 0x1860ed01)
/home/bradley/turbocharger/proxy.go:40 +0xa2
github.com/elazarl/goproxy.FuncRespHandler.Handle(0x82e6480, 0x0, 0x1861b470, 0x1)
/home/bradley/gopath/src/github.com/elazarl/goproxy/actions.go:35 +0x39
github.com/elazarl/goproxy.func·016(0x0, 0x1861b470, 0x827a768)
/home/bradley/gopath/src/github.com/elazarl/goproxy/dispatcher.go:279 +0x18f
github.com/elazarl/goproxy.FuncRespHandler.Handle(0x1868c9b0, 0x0, 0x1861b470, 0x4)
/home/bradley/gopath/src/github.com/elazarl/goproxy/actions.go:35 +0x39
github.com/elazarl/goproxy.(*ProxyHttpServer).filterResponse(0x18682640, 0x0, 0x1861b470, 0x0)
/home/bradley/gopath/src/github.com/elazarl/goproxy/proxy.go:69 +0x95
github.com/elazarl/goproxy.(*ProxyHttpServer).ServeHTTP(0x18682640, 0xb74dd780, 0x18601260, 0x18600bd0)
/home/bradley/gopath/src/github.com/elazarl/goproxy/proxy.go:115 +0x39b
net/http.serverHandler.ServeHTTP(0x18681dc0, 0xb74dd780, 0x18601260, 0x18600bd0)
/usr/lib/go/src/pkg/net/http/server.go:1673 +0x155
net/http.(*conn).serve(0x18628a00)
/usr/lib/go/src/pkg/net/http/server.go:1174 +0x8c6
created by net/http.(*Server).Serve
/usr/lib/go/src/pkg/net/http/server.go:1721 +0x2be
以下是脚本代码：
func viewResponse(response *http.Response, ctx *goproxy.ProxyCtx) *http.Response {
log.Printf("Response: %s", response.Status)
return response
}
英文:
I am trying to use Go to make a proxy server which changes certain values in the body of a request to an API however when the request is sent the following panic occurs and the request fails:
2015/05/03 14:17:52 http: panic serving 192.168.1.139:42818: runtime error: invalid memory address or nil pointer dereference
goroutine 72 [running]:
net/http.func·011()
/usr/lib/go/src/pkg/net/http/server.go:1100 +0xb1
runtime.panic(0x8258ee0, 0x83b3733)
/usr/lib/go/src/pkg/runtime/panic.c:248 +0x176
main.viewResponse(0x0, 0x1861b470, 0x1860ed01)
/home/bradley/turbocharger/proxy.go:40 +0xa2
github.com/elazarl/goproxy.FuncRespHandler.Handle(0x82e6480, 0x0, 0x1861b470, 0x1)
/home/bradley/gopath/src/github.com/elazarl/goproxy/actions.go:35 +0x39
github.com/elazarl/goproxy.func·016(0x0, 0x1861b470, 0x827a768)
/home/bradley/gopath/src/github.com/elazarl/goproxy/dispatcher.go:279 +0x18f
github.com/elazarl/goproxy.FuncRespHandler.Handle(0x1868c9b0, 0x0, 0x1861b470, 0x4)
/home/bradley/gopath/src/github.com/elazarl/goproxy/actions.go:35 +0x39
github.com/elazarl/goproxy.(*ProxyHttpServer).filterResponse(0x18682640, 0x0, 0x1861b470, 0x0)
/home/bradley/gopath/src/github.com/elazarl/goproxy/proxy.go:69 +0x95
github.com/elazarl/goproxy.(*ProxyHttpServer).ServeHTTP(0x18682640, 0xb74dd780, 0x18601260, 0x18600bd0)
/home/bradley/gopath/src/github.com/elazarl/goproxy/proxy.go:115 +0x39b
net/http.serverHandler.ServeHTTP(0x18681dc0, 0xb74dd780, 0x18601260, 0x18600bd0)
/usr/lib/go/src/pkg/net/http/server.go:1673 +0x155
net/http.(*conn).serve(0x18628a00)
/usr/lib/go/src/pkg/net/http/server.go:1174 +0x8c6
created by net/http.(*Server).Serve
/usr/lib/go/src/pkg/net/http/server.go:1721 +0x2be
Here is the script:
func viewResponse(response *http.Response, ctx *goproxy.ProxyCtx) *http.Response {
log.Printf("Response: %s", response.Status)
return response
}
答案1
得分: 1
response 是 nil。
根据文档: "如果发生错误，resp 将为 nil，ctx.RoundTrip.Error 将包含错误。"
https://github.com/elazarl/goproxy/blob/master/actions.go#L22-L28
因此，正确实现响应处理程序的方式应该是这样的:
func viewResponse(response *http.Response, ctx *goproxy.ProxyCtx) *http.Response {
if response == nil {
log.Printf("错误: %s", ctx.RoundTrip.Error)
} else {
log.Printf("响应: %s", response.Status)
}
return response
}
英文:
response is nil.
From the doc: "In case of error, resp will be nil, and ctx.RoundTrip.Error will contain the error."
https://github.com/elazarl/goproxy/blob/master/actions.go#L22-L28
So the correct way to implement your response handler is something like this:
<!-- language: go -->
func viewResponse(response *http.Response, ctx *goproxy.ProxyCtx) *http.Response {
if response == nil {
log.Printf("Error: %s", ctx.RoundTrip.Error)
} else {
log.Printf("Response: %s", response.Status)
}
return response
}
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