github.com/elfadel/cilium@v1.6.12/pkg/health/probe/probe.go (about) 1 // Copyright 2019 Authors of Cilium 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package probe 16 17 import ( 18 "fmt" 19 "net/http" 20 "net/url" 21 "time" 22 ) 23 24 // http Client for probing 25 // Use our custom client since DefaultClient specifies timeout of 0 (no timeout). 26 // See https://medium.com/@nate510/don-t-use-go-s-default-http-client-4804cb19f779. 27 // Use a timeout of 30s. 28 var client = &http.Client{Timeout: 30 * time.Second} 29 30 // GetHello performs a GET request on the /hello endpoint 31 func GetHello(host string) error { 32 hostURL, err := url.Parse(host) 33 if err != nil { 34 return err 35 } 36 37 requestURL, err := hostURL.Parse("/hello") 38 if err != nil { 39 return err 40 } 41 42 resp, err := client.Get(requestURL.String()) 43 if err != nil { 44 return err 45 } 46 defer resp.Body.Close() 47 48 if resp.StatusCode != http.StatusOK { 49 return fmt.Errorf("unexpected status code: %d %s", resp.StatusCode, resp.Status) 50 } 51 52 return nil 53 }