diff --git a/llmage/jimeng.py b/llmage/jimeng.py
index 179c351..31ef9cc 100644
--- a/llmage/jimeng.py
+++ b/llmage/jimeng.py
@@ -12,18 +12,18 @@ Host = "visual.volcengineapi.com"
 ContentType = "application/json"
 
 def utc_now():
-    try:
-        from datetime import timezone
-        return datetime.datetime.now(timezone.utc)
-    except ImportError:
-        class UTC(datetime.tzinfo):
-            def utcoffset(self, dt):
-                return datetime.timedelta(0)
-            def tzname(self, dt):
-                return "UTC"
-            def dst(self, dt):
-                return datetime.timedelta(0)
-        return datetime.datetime.now(UTC())
+	try:
+		from datetime import timezone
+		return datetime.datetime.now(timezone.utc)
+	except ImportError:
+		class UTC(datetime.tzinfo):
+			def utcoffset(self, dt):
+				return datetime.timedelta(0)
+			def tzname(self, dt):
+				return "UTC"
+			def dst(self, dt):
+				return datetime.timedelta(0)
+		return datetime.datetime.now(UTC())
 
 def jm_timestamp():
 	dt = utc_new()
@@ -31,11 +31,11 @@ def jm_timestamp():
 
 # sha256 非对称加密
 def hmac_sha256(key: bytes, content: str):
-    return hmac.new(key, content.encode("utf-8"), hashlib.sha256).digest()
+	return hmac.new(key, content.encode("utf-8"), hashlib.sha256).digest()
 
 # sha256 hash算法
 def hash_sha256(content: str):
-    return hashlib.sha256(content.encode("utf-8")).hexdigest()
+	return hashlib.sha256(content.encode("utf-8")).hexdigest()
 
 def jimeng_auth_headers(opts):
 	apikey = opts.get('apikey')
@@ -48,51 +48,51 @@ def jimeng_auth_headers(opts):
 	content_type = headers.get('Content-Type')
 	x_date = jm_timestamp()
 	short_x_date = DT[:8]
-    credential = {
-        "access_key_id": apikey,
-        "secret_access_key": secretkey,
-        "service": Service,
-        "region": Region,
-    }
+	credential = {
+		"access_key_id": apikey,
+		"secret_access_key": secretkey,
+		"service": Service,
+		"region": Region,
+	}
 	x_content_sha256 = hash_sha256(body)
 	sign_result = {
-        "Host": Host,
-        "X-Content-Sha256": x_content_sha256,
-        "X-Date": x_date,
-        "Content-Type": ContentType
-    }
+		"Host": Host,
+		"X-Content-Sha256": x_content_sha256,
+		"X-Date": x_date,
+		"Content-Type": ContentType
+	}
 	headers.update(sign_result)
 	signed_headers_str = ";".join(
-        ["content-type", "host", "x-content-sha256", "x-date"]
-    )
+		["content-type", "host", "x-content-sha256", "x-date"]
+	)
 	canonical_request_str = "\n".join(
-        [method.upper(),
-         path,
-         norm_query(params),
-         "\n".join(
-             [
-                 "content-type:" + content_type,
-                 "host:" + Host,
-                 "x-content-sha256:" + x_content_sha256,
-                 "x-date:" + x_date,
-                 ]
-         ),
-         "",
-         signed_headers_str,
-         x_content_sha256,
-         ]
-    )
+		[method.upper(),
+		 path,
+		 norm_query(params),
+		 "\n".join(
+			 [
+				 "content-type:" + content_type,
+				 "host:" + Host,
+				 "x-content-sha256:" + x_content_sha256,
+				 "x-date:" + x_date,
+				 ]
+		 ),
+		 "",
+		 signed_headers_str,
+		 x_content_sha256,
+		 ]
+	)
 	hashed_canonical_request = hash_sha256(canonical_request_str)
 	credential_scope = "/".join([short_x_date, credential["region"], credential["service"], "request"])
 	string_to_sign = "\n".join(["HMAC-SHA256", x_date, credential_scope, hashed_canonical_request])
 	k_date = hmac_sha256(secretkey.encode("utf-8"), short_x_date)
-    k_region = hmac_sha256(k_date, credential["region"])
-    k_service = hmac_sha256(k_region, credential["service"])
-    k_signing = hmac_sha256(k_service, "request")
-    signature = hmac_sha256(k_signing, string_to_sign).hex()
+	k_region = hmac_sha256(k_date, credential["region"])
+	k_service = hmac_sha256(k_region, credential["service"])
+	k_signing = hmac_sha256(k_service, "request")
+	signature = hmac_sha256(k_signing, string_to_sign).hex()
 	headers['Authorization'] = "HMAC-SHA256 Credential={}, SignedHeaders={}, Signature={}".format(
-        apikey + "/" + credential_scope,
-        signed_headers_str,
-        signature,
-        )
+		apikey + "/" + credential_scope,
+		signed_headers_str,
+		signature,
+		)