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net/http: transport.go: strange assignment func(pc *persistConn) cancelRequest(error) to func(error) #33634

gdi63 opened this issue Aug 13, 2019 · 1 comment


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@gdi63 gdi63 commented Aug 13, 2019

Does it really work? Does func(error) type match to method of persistConn

type Transport struct {
reqCanceler map[*Request]func(error)

func (t *Transport) replaceReqCanceler(r *Request, fn func(error)) bool {
t.reqCanceler[r] = fn

func (pc *persistConn) cancelRequest(err error) {

func (pc *persistConn) roundTrip(req *transportRequest) (resp *Response, err error) {
if !pc.t.replaceReqCanceler(req.Request, pc.cancelRequest) {

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@smasher164 smasher164 commented Aug 13, 2019

Yes, it matches. See
Here is a playground example to demonstrate this behavior:
For questions about Go, see

@smasher164 smasher164 closed this Aug 13, 2019
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