Function DoHTTPProbe

pkg/probe/http/http.go:93–123

DoHTTPProbe checks if a GET request to the url succeeds. If the HTTP response code is successful (i.e. 400 > code >= 200), it returns Success. If the HTTP response code is unsuccessful or HTTP communication fails, it returns Failure. This is exported because some other packages may want to do direct

(req *http.Request, client GetHTTPInterface)

// If the HTTP response code is unsuccessful or HTTP communication fails, it returns Failure.
// This is exported because some other packages may want to do direct HTTP probes.
func DoHTTPProbe(req *http.Request, client GetHTTPInterface) (probe.Result, string, error) {
	url := req.URL
	headers := req.Header
	res, err := client.Do(req)
	if err != nil {
		// Convert errors into failures to catch timeouts.
		return probe.Failure, err.Error(), nil
	}
	defer res.Body.Close()
	b, err := utilio.ReadAtMost(res.Body, maxRespBodyLength)
	if err != nil {
		if err == utilio.ErrLimitReached {
			klog.V(4).Infof("Non fatal body truncation for %s, Response: %v", url.String(), *res)
		} else {
			return probe.Failure, "", err
		}
	}
	body := string(b)
	if res.StatusCode >= http.StatusOK && res.StatusCode < http.StatusBadRequest {
		if res.StatusCode >= http.StatusMultipleChoices { // Redirect
			klog.V(4).Infof("Probe terminated redirects for %s, Response: %v", url.String(), *res)
			return probe.Warning, fmt.Sprintf("Probe terminated redirects, Response body: %v", body), nil
		}
		klog.V(4).Infof("Probe succeeded for %s, Response: %v", url.String(), *res)
		return probe.Success, body, nil
	}
	klog.V(4).Infof("Probe failed for %s with request headers %v, response body: %v", url.String(), headers, body)
	// Note: Until https://issue.k8s.io/99425 is addressed, this user-facing failure message must not contain the response body.
	failureMsg := fmt.Sprintf("HTTP probe failed with statuscode: %d", res.StatusCode)
	return probe.Failure, failureMsg, nil
}

// RedirectChecker returns a function that can be used to check HTTP redirects.
func RedirectChecker(followNonLocalRedirects bool) func(*http.Request, []*http.Request) error {