diff --git a/relay/channel/vertex/service_account.go b/relay/channel/vertex/service_account.go
index cc640803..1d41c945 100644
--- a/relay/channel/vertex/service_account.go
+++ b/relay/channel/vertex/service_account.go
@@ -11,6 +11,7 @@ import (
 	"net/http"
 	"net/url"
 	relaycommon "one-api/relay/common"
+	"one-api/service"
 	"strings"
 
 	"fmt"
@@ -45,7 +46,7 @@ func getAccessToken(a *Adaptor, info *relaycommon.RelayInfo) (string, error) {
 	if err != nil {
 		return "", fmt.Errorf("failed to create signed JWT: %w", err)
 	}
-	newToken, err := exchangeJwtForAccessToken(signedJWT)
+	newToken, err := exchangeJwtForAccessToken(signedJWT, info)
 	if err != nil {
 		return "", fmt.Errorf("failed to exchange JWT for access token: %w", err)
 	}
@@ -96,14 +97,25 @@ func createSignedJWT(email, privateKeyPEM string) (string, error) {
 	return signedToken, nil
 }
 
-func exchangeJwtForAccessToken(signedJWT string) (string, error) {
+func exchangeJwtForAccessToken(signedJWT string, info *relaycommon.RelayInfo) (string, error) {
 
 	authURL := "https://www.googleapis.com/oauth2/v4/token"
 	data := url.Values{}
 	data.Set("grant_type", "urn:ietf:params:oauth:grant-type:jwt-bearer")
 	data.Set("assertion", signedJWT)
 
-	resp, err := http.PostForm(authURL, data)
+	var client *http.Client
+	var err error
+	if proxyURL, ok := info.ChannelSetting["proxy"]; ok {
+		client, err = service.NewProxyHttpClient(proxyURL.(string))
+		if err != nil {
+			return "", fmt.Errorf("new proxy http client failed: %w", err)
+		}
+	} else {
+		client = service.GetHttpClient()
+	}
+
+	resp, err := client.PostForm(authURL, data)
 	if err != nil {
 		return "", err
 	}