I got an unexpected error *The system cannot find the file specified.* when
calling method `RoundTrip(req *Request)` from `http.Transport`.
*Error occurs on a Windows 10 Enterprise (19041) maschine. Not my maschine,
so no debugging.*
*Implementation*
This go application is only a simple reverse proxy which adds TLS Client
Auth.
```go
transport:= &http.Transport{
DialContext: (&net.Dialer{
KeepAlive: 1 * time.Minute,
Timeout: 1 * time.Minute,
}).DialContext,
IdleConnTimeout: 1 * time.Hour,
TLSHandshakeTimeout: 20 * time.Second,
ExpectContinueTimeout: 20 * time.Second,
ResponseHeaderTimeout: 1 * time.Minute,
MaxIdleConns: 100,
MaxIdleConnsPerHost: 4,
}
if ProxyURL != nil {
transport.Proxy = http.ProxyURL(ProxyURL)
}
transport.TLSClientConfig = &tls.Config{
Certificates: []tls.Certificate{certificate},
}
response, err := transport.RoundTrip(r)
if err != nil {
t.Logger.Errorf("Error at send to %v in %vms with error ", r.URL,
elapsed.Milliseconds(), err.Error())
}
```
- `certificate` is a `tls.Certificate`
- `r` is a `*http.Request`
*Error Message*
```
Error at send to https://example.org:443 in 88ms with error %!(EXTRA
string=The system cannot find the file specified.)
```
My guess is, that a Windows Api Call cannot find a file or registry entry,
maybe while reading the Root CAs?
*Does anyone had simlar experience and can give me a hint? How to fix the
windows system; or a workaround in Go?*
Link to implementation of net/http/transport.go:
https://github.com/golang/go/blob/e9e0d1ef704c4bba3927522be86937164a61100c/src/net/http/transport.go#L504
Link to implementation of root CAs in windows
https://golang.org/src/crypto/x509/root_windows.go
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