check http response when downloading file.

providers/providers.go

@@ -212,10 +212,17 @@ func installVersion(name string, version string) (*Provider, error) {
 	log.Debug().Str("url", url).Msg("installing provider from URL")
 	res, err := http.Get(url)
 	if err != nil {
-		log.Debug().Str("url", url).Msg("failed to install form URL (get request)")
+		log.Debug().Str("url", url).Msg("failed to install from URL (get request)")
 		return nil, errors.Wrap(err, "failed to install "+name+"-"+version)
 	}
+	if res.StatusCode == http.StatusNotFound {
+		return nil, errors.New("cannot find provider " + name + "-" + version + " under url " + url)
+	} else if res.StatusCode != http.StatusOK {
+		log.Debug().Str("url", url).Int("status", res.StatusCode).Msg("failed to install from URL (status code)")
+		return nil, errors.New("failed to install " + name + "-" + version + ", received status code: " + res.Status)
+	}
 
+	// else we know we got a 200 response, we can safely install
 	installed, err := InstallIO(res.Body, InstallConf{
 		Dst: DefaultPath,
 	})