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errors.go
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errors.go
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package goproxy
import (
"errors"
"fmt"
"io"
"net/http"
)
type HTTPError struct {
Code int
URL string
Message string
}
func buildHTTPError(req *http.Request, rsp *http.Response) *HTTPError {
msg, _ := io.ReadAll(rsp.Body)
return &HTTPError{
Code: rsp.StatusCode,
URL: req.URL.String(),
Message: string(msg),
}
}
func (err *HTTPError) Error() string {
if err.Message != "" {
return fmt.Sprintf("%s (HTTP code: %d)", err.Message, err.Code)
}
return fmt.Sprintf("GET %s - %s (HTTP code: %d)",
err.URL, http.StatusText(err.Code), err.Code)
}
func IsHTTPError(err error) (*HTTPError, bool) {
target := new(HTTPError)
ok := errors.As(err, &target)
if !ok {
return nil, false
}
return target, true
}
func IsNotFoundError(err error) (*HTTPError, bool) {
httpErr, ok := IsHTTPError(err)
if !ok {
return nil, false
}
if httpErr.Code != http.StatusNotFound {
return nil, false
}
return httpErr, true
}