// Redirect returns the redirect target as an absolute URL.
// If the Response is not a redirect of the pointed URL is
// not valid, an error is returned.
func (r *Response) Redirect() (string, error) {
if r.IsRedirect() {
location := r.Header.Get("Location")
return urlutil.Join(r.Request.URL.String(), location)
}
return "", fmt.Errorf("response is not a redirect (status code %d)", r.StatusCode)
}
// Next returns true iff the Iter could perform a trip
// using Client.Trip with the current *http.Request.
// Calling Next() closes the previous *Response automatically
// if it was a redirect.
func (i *Iter) Next() bool {
if i.err != nil {
return false
}
if i.resp == nil {
// First request, do some sanity checks
if i.req.Method == "POST" || i.req.Method == "PUT" {
i.err = fmt.Errorf("can't iter over Request with method %s", i.req.Method)
return false
}
if i.req.Body != nil {
i.err = errors.New("can't iter over Request with a body")
return false
}
} else {
// 2nd and subsequent requests
if !i.resp.IsRedirect() {
return false
}
i.resp.Close()
location := i.resp.Header.Get("Location")
next, err := urlutil.Join(i.req.URL.String(), location)
if err != nil {
i.err = err
return false
}
req, err := http.NewRequest(i.req.Method, next, nil)
if err != nil {
i.err = err
return false
}
i.req = req
}
resp, err := i.c.Trip(i.req)
if err != nil {
i.err = err
return false
}
i.resp = resp
return resp.IsRedirect()
}