diff --git a/internal/cmd/artifacts/download.go b/internal/cmd/artifacts/download.go
index 03c28e928..5665a18e2 100644
--- a/internal/cmd/artifacts/download.go
+++ b/internal/cmd/artifacts/download.go
@@ -8,6 +8,7 @@ import (
 
 	cmds "github.com/saucelabs/saucectl/internal/cmd"
 	"github.com/saucelabs/saucectl/internal/fpath"
+	"github.com/saucelabs/saucectl/internal/http"
 	"github.com/saucelabs/saucectl/internal/segment"
 	"github.com/saucelabs/saucectl/internal/usage"
 	"github.com/schollz/progressbar/v3"
@@ -33,7 +34,12 @@ func DownloadCommand() *cobra.Command {
 
 			return nil
 		},
-		PreRun: func(cmd *cobra.Command, args []string) {
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			err := http.CheckProxy()
+			if err != nil {
+				return fmt.Errorf("invalid HTTP_PROXY value")
+			}
+
 			tracker := segment.DefaultTracker
 
 			go func() {
@@ -43,6 +49,7 @@ func DownloadCommand() *cobra.Command {
 				)
 				_ = tracker.Close()
 			}()
+			return nil
 		},
 		RunE: func(cmd *cobra.Command, args []string) error {
 			jobID := args[0]
diff --git a/internal/cmd/artifacts/list.go b/internal/cmd/artifacts/list.go
index 62ee79521..bcdac2933 100644
--- a/internal/cmd/artifacts/list.go
+++ b/internal/cmd/artifacts/list.go
@@ -10,6 +10,7 @@ import (
 	"github.com/jedib0t/go-pretty/v6/text"
 	"github.com/saucelabs/saucectl/internal/artifacts"
 	cmds "github.com/saucelabs/saucectl/internal/cmd"
+	"github.com/saucelabs/saucectl/internal/http"
 	"github.com/saucelabs/saucectl/internal/segment"
 	"github.com/saucelabs/saucectl/internal/usage"
 	"github.com/spf13/cobra"
@@ -72,7 +73,12 @@ func ListCommand() *cobra.Command {
 
 			return nil
 		},
-		PreRun: func(cmd *cobra.Command, args []string) {
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			err := http.CheckProxy()
+			if err != nil {
+				return fmt.Errorf("invalid HTTP_PROXY value")
+			}
+
 			tracker := segment.DefaultTracker
 
 			go func() {
@@ -82,6 +88,7 @@ func ListCommand() *cobra.Command {
 				)
 				_ = tracker.Close()
 			}()
+			return nil
 		},
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return list(args[0], out)
diff --git a/internal/cmd/artifacts/upload.go b/internal/cmd/artifacts/upload.go
index 378edb5fd..a7c45ec9a 100644
--- a/internal/cmd/artifacts/upload.go
+++ b/internal/cmd/artifacts/upload.go
@@ -6,6 +6,7 @@ import (
 	"os"
 
 	cmds "github.com/saucelabs/saucectl/internal/cmd"
+	"github.com/saucelabs/saucectl/internal/http"
 	"github.com/saucelabs/saucectl/internal/segment"
 	"github.com/saucelabs/saucectl/internal/usage"
 	"github.com/schollz/progressbar/v3"
@@ -31,7 +32,12 @@ func UploadCommand() *cobra.Command {
 
 			return nil
 		},
-		PreRun: func(cmd *cobra.Command, args []string) {
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			err := http.CheckProxy()
+			if err != nil {
+				return fmt.Errorf("invalid HTTP_PROXY value")
+			}
+
 			tracker := segment.DefaultTracker
 
 			go func() {
@@ -41,6 +47,7 @@ func UploadCommand() *cobra.Command {
 				)
 				_ = tracker.Close()
 			}()
+			return nil
 		},
 		RunE: func(cmd *cobra.Command, args []string) error {
 			jobID := args[0]
diff --git a/internal/cmd/imagerunner/artifacts.go b/internal/cmd/imagerunner/artifacts.go
index 5683ea35c..435e782b2 100644
--- a/internal/cmd/imagerunner/artifacts.go
+++ b/internal/cmd/imagerunner/artifacts.go
@@ -14,6 +14,7 @@ import (
 	szip "github.com/saucelabs/saucectl/internal/archive/zip"
 	cmds "github.com/saucelabs/saucectl/internal/cmd"
 	"github.com/saucelabs/saucectl/internal/files"
+	"github.com/saucelabs/saucectl/internal/http"
 	"github.com/saucelabs/saucectl/internal/imagerunner"
 	"github.com/saucelabs/saucectl/internal/segment"
 	"github.com/saucelabs/saucectl/internal/usage"
@@ -91,7 +92,12 @@ func downloadCommand() *cobra.Command {
 
 			return nil
 		},
-		PreRun: func(cmd *cobra.Command, args []string) {
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			err := http.CheckProxy()
+			if err != nil {
+				return fmt.Errorf("invalid HTTP_PROXY value")
+			}
+
 			tracker := segment.DefaultTracker
 
 			go func() {
@@ -101,6 +107,7 @@ func downloadCommand() *cobra.Command {
 				)
 				_ = tracker.Close()
 			}()
+			return nil
 		},
 		RunE: func(cmd *cobra.Command, args []string) error {
 			ID := args[0]
diff --git a/internal/cmd/imagerunner/logs.go b/internal/cmd/imagerunner/logs.go
index 7613dcbd4..4e5717a1f 100644
--- a/internal/cmd/imagerunner/logs.go
+++ b/internal/cmd/imagerunner/logs.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	cmds "github.com/saucelabs/saucectl/internal/cmd"
+	"github.com/saucelabs/saucectl/internal/http"
 	imgrunner "github.com/saucelabs/saucectl/internal/imagerunner"
 	"github.com/saucelabs/saucectl/internal/segment"
 	"github.com/saucelabs/saucectl/internal/usage"
@@ -17,7 +18,12 @@ func LogsCommand() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "logs <runID>",
 		Short: "Fetch the logs for an imagerunner run",
-		PreRun: func(cmd *cobra.Command, args []string) {
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			err := http.CheckProxy()
+			if err != nil {
+				return fmt.Errorf("invalid HTTP_PROXY value")
+			}
+
 			tracker := segment.DefaultTracker
 
 			go func() {
@@ -27,6 +33,7 @@ func LogsCommand() *cobra.Command {
 				)
 				_ = tracker.Close()
 			}()
+			return nil
 		},
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return exec(args[0])
diff --git a/internal/cmd/ini/cmd.go b/internal/cmd/ini/cmd.go
index 8b4a37713..ddc642618 100644
--- a/internal/cmd/ini/cmd.go
+++ b/internal/cmd/ini/cmd.go
@@ -13,6 +13,7 @@ import (
 	"github.com/saucelabs/saucectl/internal/cypress"
 	"github.com/saucelabs/saucectl/internal/espresso"
 	"github.com/saucelabs/saucectl/internal/flags"
+	"github.com/saucelabs/saucectl/internal/http"
 	"github.com/saucelabs/saucectl/internal/imagerunner"
 	"github.com/saucelabs/saucectl/internal/msg"
 	"github.com/saucelabs/saucectl/internal/playwright"
@@ -74,6 +75,9 @@ func Command() *cobra.Command {
 		Short:   initShort,
 		Long:    initLong,
 		Example: initExample,
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			return preRun()
+		},
 		Run: func(cmd *cobra.Command, args []string) {
 			tracker := segment.DefaultTracker
 
@@ -109,6 +113,14 @@ func Command() *cobra.Command {
 	return cmd
 }
 
+func preRun() error {
+	err := http.CheckProxy()
+	if err != nil {
+		return fmt.Errorf("invalid HTTP_PROXY value")
+	}
+	return nil
+}
+
 // Run runs the command
 func Run(cmd *cobra.Command, initCfg *initConfig) error {
 	if cmd.Flags().Changed("framework") {
diff --git a/internal/cmd/run/run.go b/internal/cmd/run/run.go
index 5227668d2..3851dc507 100644
--- a/internal/cmd/run/run.go
+++ b/internal/cmd/run/run.go
@@ -178,6 +178,11 @@ func Command() *cobra.Command {
 
 // preRun is a pre-run step that is executed before the main 'run` step. All shared dependencies are initialized here.
 func preRun() error {
+	err := http.CheckProxy()
+	if err != nil {
+		return fmt.Errorf("invalid HTTP_PROXY value")
+	}
+
 	println("Running version", version.Version)
 	checkForUpdates()
 	go awaitGlobalTimeout()
diff --git a/internal/http/apitester.go b/internal/http/apitester.go
index 65ca36be6..f360e6ace 100644
--- a/internal/http/apitester.go
+++ b/internal/http/apitester.go
@@ -33,10 +33,13 @@ type PublishedTest struct {
 // NewAPITester a new instance of APITester.
 func NewAPITester(url string, username string, accessKey string, timeout time.Duration) APITester {
 	return APITester{
-		HTTPClient: &http.Client{Timeout: timeout},
-		URL:        url,
-		Username:   username,
-		AccessKey:  accessKey,
+		HTTPClient: &http.Client{
+			Timeout:   timeout,
+			Transport: &http.Transport{Proxy: http.ProxyFromEnvironment},
+		},
+		URL:       url,
+		Username:  username,
+		AccessKey: accessKey,
 	}
 }
 
diff --git a/internal/http/appstore.go b/internal/http/appstore.go
index 6b9037457..c27a8688a 100644
--- a/internal/http/appstore.go
+++ b/internal/http/appstore.go
@@ -56,10 +56,13 @@ type AppStore struct {
 // NewAppStore returns an implementation for AppStore
 func NewAppStore(url, username, accessKey string, timeout time.Duration) *AppStore {
 	return &AppStore{
-		HTTPClient: &http.Client{Timeout: timeout},
-		URL:        url,
-		Username:   username,
-		AccessKey:  accessKey,
+		HTTPClient: &http.Client{
+			Timeout:   timeout,
+			Transport: &http.Transport{Proxy: http.ProxyFromEnvironment},
+		},
+		URL:       url,
+		Username:  username,
+		AccessKey: accessKey,
 	}
 }
 
@@ -128,6 +131,9 @@ func (s *AppStore) UploadStream(filename, description string, reader io.Reader)
 	req.SetBasicAuth(s.Username, s.AccessKey)
 
 	resp, err := s.HTTPClient.Do(req)
+	if err != nil {
+		return storage.Item{}, err
+	}
 
 	switch resp.StatusCode {
 	case 200, 201:
diff --git a/internal/http/client.go b/internal/http/client.go
index 25458dd96..906b4ef05 100644
--- a/internal/http/client.go
+++ b/internal/http/client.go
@@ -10,7 +10,10 @@ import (
 // NewRetryableClient returns a new pre-configured instance of retryablehttp.Client.
 func NewRetryableClient(timeout time.Duration) *retryablehttp.Client {
 	return &retryablehttp.Client{
-		HTTPClient:   &http.Client{Timeout: timeout},
+		HTTPClient: &http.Client{
+			Timeout:   timeout,
+			Transport: &http.Transport{Proxy: http.ProxyFromEnvironment},
+		},
 		RetryWaitMin: 1 * time.Second,
 		RetryWaitMax: 30 * time.Second,
 		RetryMax:     3,
diff --git a/internal/http/github.go b/internal/http/github.go
index 0e75fc0f9..3f581d7b1 100644
--- a/internal/http/github.go
+++ b/internal/http/github.go
@@ -12,8 +12,11 @@ import (
 
 // DefaultGitHub is a preconfigured instance of GitHub.
 var DefaultGitHub = GitHub{
-	HTTPClient: &http.Client{Timeout: 2 * time.Second},
-	URL:        "https://api.github.com",
+	HTTPClient: &http.Client{
+		Timeout:   4 * time.Second,
+		Transport: &http.Transport{Proxy: http.ProxyFromEnvironment},
+	},
+	URL: "https://api.github.com",
 }
 
 // GitHub represents the GitHub HTTP API client.
diff --git a/internal/http/insightsservice.go b/internal/http/insightsservice.go
index 8f8c9c932..96cf30230 100644
--- a/internal/http/insightsservice.go
+++ b/internal/http/insightsservice.go
@@ -59,7 +59,10 @@ var LaunchOptions = map[config.LaunchOrder]string{
 
 func NewInsightsService(url string, creds iam.Credentials, timeout time.Duration) InsightsService {
 	return InsightsService{
-		HTTPClient:  &http.Client{Timeout: timeout},
+		HTTPClient: &http.Client{
+			Timeout:   timeout,
+			Transport: &http.Transport{Proxy: http.ProxyFromEnvironment},
+		},
 		URL:         url,
 		Credentials: creds,
 	}
diff --git a/internal/http/proxy.go b/internal/http/proxy.go
new file mode 100644
index 000000000..70686849e
--- /dev/null
+++ b/internal/http/proxy.go
@@ -0,0 +1,86 @@
+package http
+
+import (
+	"fmt"
+	"net/url"
+	"os"
+	"strings"
+
+	"github.com/fatih/color"
+	"github.com/rs/zerolog/log"
+)
+
+// Note: The verification logic is borrowed from golang.org/x/net/http/httpproxy.
+// Those useful functions are not exposed, but are required to allow us to warn
+// the user upfront.
+func getEnvAny(names ...string) string {
+	for _, n := range names {
+		if val := os.Getenv(n); val != "" {
+			return val
+		}
+	}
+	return ""
+}
+
+func parseProxy(proxy string) (*url.URL, error) {
+	if proxy == "" {
+		return nil, nil
+	}
+
+	proxyURL, err := url.Parse(proxy)
+	if err != nil ||
+		(proxyURL.Scheme != "http" &&
+			proxyURL.Scheme != "https" &&
+			proxyURL.Scheme != "socks5") {
+		// proxy was bogus. Try prepending "http://" to it and
+		// see if that parses correctly. If not, we fall
+		// through and complain about the original one.
+		if proxyURL, err := url.Parse("http://" + proxy); err == nil {
+			return proxyURL, nil
+		}
+	}
+	if err != nil {
+		return nil, fmt.Errorf("invalid proxy address %q: %v", proxy, err)
+	}
+	return proxyURL, nil
+}
+
+func doCheckProxy(scheme string) error {
+	proxyScheme := fmt.Sprintf("%s_proxy", scheme)
+	rawProxyURL := getEnvAny(strings.ToUpper(proxyScheme), strings.ToLower(proxyScheme))
+	proxyURL, err := parseProxy(rawProxyURL)
+
+	if err != nil {
+		color.Red("\nA proxy has been set, but its url is invalid !\n\n")
+		fmt.Printf("%s: %s", rawProxyURL, err)
+		return fmt.Errorf("invalid %s value", strings.ToUpper(proxyScheme))
+	}
+	if proxyURL == nil {
+		return nil
+	}
+
+	// Hide login/password
+	if proxyURL.User != nil {
+		pass, hasPass := proxyURL.User.Password()
+		if hasPass {
+			rawProxyURL = strings.Replace(rawProxyURL, pass, "****", -1)
+		}
+	}
+	log.Info().Msgf(fmt.Sprintf("Using %s proxy: %s", strings.ToUpper(scheme), rawProxyURL))
+	return nil
+}
+
+// CheckProxy checks that the HTTP_PROXY is valid if it exists.
+func CheckProxy() error {
+	var errs []error
+	if err := doCheckProxy("http"); err != nil {
+		errs = append(errs, err)
+	}
+	if err := doCheckProxy("https"); err != nil {
+		errs = append(errs, err)
+	}
+	if len(errs) != 0 {
+		return fmt.Errorf("proxy setup has %d error(s)", len(errs))
+	}
+	return nil
+}
diff --git a/internal/http/testcomposer.go b/internal/http/testcomposer.go
index 494ad6e35..5d2f18c30 100644
--- a/internal/http/testcomposer.go
+++ b/internal/http/testcomposer.go
@@ -51,7 +51,10 @@ type runner struct {
 
 func NewTestComposer(url string, creds iam.Credentials, timeout time.Duration) TestComposer {
 	return TestComposer{
-		HTTPClient:  &http.Client{Timeout: timeout},
+		HTTPClient: &http.Client{
+			Timeout:   timeout,
+			Transport: &http.Transport{Proxy: http.ProxyFromEnvironment},
+		},
 		URL:         url,
 		Credentials: creds,
 	}
diff --git a/internal/http/userservice.go b/internal/http/userservice.go
index bf9d9b0c8..c6e9c005f 100644
--- a/internal/http/userservice.go
+++ b/internal/http/userservice.go
@@ -19,7 +19,10 @@ type UserService struct {
 
 func NewUserService(url string, creds iam.Credentials, timeout time.Duration) UserService {
 	return UserService{
-		HTTPClient:  &http.Client{Timeout: timeout},
+		HTTPClient: &http.Client{
+			Timeout:   timeout,
+			Transport: &http.Transport{Proxy: http.ProxyFromEnvironment},
+		},
 		URL:         url,
 		Credentials: creds,
 	}
diff --git a/internal/http/webdriver.go b/internal/http/webdriver.go
index b016a37f2..40bc754a9 100644
--- a/internal/http/webdriver.go
+++ b/internal/http/webdriver.go
@@ -88,7 +88,8 @@ type sessionStartResponse struct {
 func NewWebdriver(url string, creds iam.Credentials, timeout time.Duration) Webdriver {
 	return Webdriver{
 		HTTPClient: &http.Client{
-			Timeout: timeout,
+			Timeout:   timeout,
+			Transport: &http.Transport{Proxy: http.ProxyFromEnvironment},
 			CheckRedirect: func(req *http.Request, via []*http.Request) error {
 				// Sauce can queue up Job start requests for up to 10 minutes and sends redirects in the meantime to
 				// keep the connection alive. A redirect is sent every 45 seconds.