Go http GET client test

httpclient.go

package main

import (
	"crypto/tls"
	"fmt"
	"net/http"
)

func get(url string, allowInsecure bool, proxyfromclientset bool) (*http.Response, error) {
	client := http.DefaultClient
	if allowInsecure {
		tr := &http.Transport{TLSClientConfig: &tls.Config{InsecureSkipVerify: true}}
		client = &http.Client{Transport: tr}
	} else if proxyfromclientset {
		tr := &http.Transport{
			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
			Proxy:           http.ProxyFromEnvironment,
		}
		client = &http.Client{Transport: tr}
	}

	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return nil, fmt.Errorf("error creating request: %v", err)
	}

	req.Header.Add("X-Docker-Token", "true")
	resp, err := client.Do(req)
	if err != nil {
		return nil, err
	}

	return resp, nil
}

func main() {
	url1 := fmt.Sprintf("http://registry.access.redhat.com/v1/repositories/openshift3_beta/%s/images", "mysql-55-rhel7")
	url2 := fmt.Sprintf("https://registry.access.redhat.com/v1/repositories/openshift3_beta/%s/images", "mysql-55-rhel7")

	urls := [2]string{url1, url2}
	for i := range urls {
		allowInsecure := false
		proxyfromclientset := false

		fmt.Printf("\n")
		fmt.Printf("url: %s, http.Client modified: %t, proxyfromclient set: %t\n", urls[i], allowInsecure, proxyfromclientset)
		fmt.Printf("---------\n")
		if resp, err := get(urls[i], allowInsecure, proxyfromclientset); err != nil {
			fmt.Println(err)
		} else {
			fmt.Println(resp)
		}

		allowInsecure = true

		fmt.Printf("\n")
		fmt.Printf("url: %s, http.Client modified: %t, proxyfromclient set: %t\n", urls[i], allowInsecure, proxyfromclientset)
		fmt.Printf("---------\n")

		if resp, err := get(urls[i], allowInsecure, proxyfromclientset); err != nil {
			fmt.Println(err)
		} else {
			fmt.Println(resp)
		}

		allowInsecure = false
		proxyfromclientset = true

		fmt.Printf("\n")
		fmt.Printf("url: %s, http.Client modified: %t, proxyfromclient set: %t\n", urls[i], allowInsecure, proxyfromclientset)
		fmt.Printf("---------\n")

		if resp, err := get(urls[i], allowInsecure, proxyfromclientset); err != nil {
			fmt.Println(err)
		} else {
			fmt.Println(resp)
		}
	}
}

Usage:

• Replace knakayam:redhat with USERNAME:PASSWD and localhost:3128 with PROXYHOST:PROXYPORT

# HTTP_PROXY=http://knakayam:redhat@localhost:3128 HTTPS_PROXY=https://knakayam:redhat@localhost:3128 ./httpclient

Output:

• Check if it passed proxy or not with Via:[1.1 ose3-master.example.com (squid/3.3.8)]

url: http://registry.access.redhat.com/v1/repositories/openshift3_beta/mysql-55-rhel7/images, http.Client modified: false, proxyfromclient set: false
---------
&{200 OK 200 HTTP/1.1 1 1 map[Server:[Apache] Content-Type:[application/json] Via:[1.1 ose3-master.example.com (squid/3.3.8)] Connection:[keep-alive] X-Cache:[MISS from ose3-master.example.com] X-Cache-Lookup:[MISS from ose3-master.example.com:3128] Date:[Tue, 16 Jun 2015 09:22:50 GMT] Content-Length:[1976] X-Docker-Endpoints:[registry.access.redhat.com] X-Docker-Registry-Version:[0.6.6] X-Docker-Registry-Config:[common]] 0xc208040180 1976 [] false map[] 0xc208029380 <nil>}

url: http://registry.access.redhat.com/v1/repositories/openshift3_beta/mysql-55-rhel7/images, http.Client modified: true, proxyfromclient set: false
---------
&{200 OK 200 HTTP/1.1 1 1 map[Content-Length:[1976] X-Docker-Endpoints:[registry.access.redhat.com] X-Docker-Registry-Version:[0.6.6] X-Docker-Registry-Config:[common] Content-Type:[application/json] Date:[Tue, 16 Jun 2015 09:22:51 GMT] Server:[Apache]] 0xc208040340 1976 [] true map[] 0xc208028270 <nil>}

url: http://registry.access.redhat.com/v1/repositories/openshift3_beta/mysql-55-rhel7/images, http.Client modified: false, proxyfromclient set: true
---------
&{200 OK 200 HTTP/1.1 1 1 map[Server:[Apache] Content-Length:[1976] X-Docker-Endpoints:[registry.access.redhat.com] Content-Type:[application/json] Via:[1.1 ose3-master.example.com (squid/3.3.8)] Connection:[keep-alive] Date:[Tue, 16 Jun 2015 09:22:51 GMT] X-Docker-Registry-Version:[0.6.6] X-Docker-Registry-Config:[common] X-Cache:[MISS from ose3-master.example.com] X-Cache-Lookup:[MISS from ose3-master.example.com:3128]] 0xc208040440 1976 [] false map[] 0xc208028340 <nil>}

url: https://registry.access.redhat.com/v1/repositories/openshift3_beta/mysql-55-rhel7/images, http.Client modified: false, proxyfromclient set: false
---------
&{200 OK 200 HTTP/1.1 1 1 map[Server:[Apache] Content-Length:[1976] X-Docker-Endpoints:[registry.access.redhat.com] X-Docker-Registry-Version:[0.6.6] X-Docker-Registry-Config:[common] Content-Type:[application/json] Date:[Tue, 16 Jun 2015 09:22:52 GMT]] 0xc20821fd40 1976 [] true map[] 0xc2080284e0 0xc2081a3080}

url: https://registry.access.redhat.com/v1/repositories/openshift3_beta/mysql-55-rhel7/images, http.Client modified: true, proxyfromclient set: false
---------
&{200 OK 200 HTTP/1.1 1 1 map[Content-Type:[application/json] Date:[Tue, 16 Jun 2015 09:22:52 GMT] Server:[Apache] Content-Length:[1976] X-Docker-Endpoints:[registry.access.redhat.com] X-Docker-Registry-Version:[0.6.6] X-Docker-Registry-Config:[common]] 0xc20819a540 1976 [] true map[] 0xc208029450 0xc2081a3ec0}

url: https://registry.access.redhat.com/v1/repositories/openshift3_beta/mysql-55-rhel7/images, http.Client modified: false, proxyfromclient set: true
---------
&{200 OK 200 HTTP/1.1 1 1 map[X-Docker-Registry-Config:[common] Content-Type:[application/json] Date:[Tue, 16 Jun 2015 09:22:53 GMT] Server:[Apache] Content-Length:[1976] X-Docker-Endpoints:[registry.access.redhat.com] X-Docker-Registry-Version:[0.6.6]] 0xc20819ad40 1976 [] true map[] 0xc208029a00 0xc208005e60}