[Fix] fix ipv6 url when warm up model (#1537)

python/sglang/srt/utils.py

@@ -16,6 +16,7 @@ limitations under the License.
 """Common utilities."""
 
 import base64
+import ipaddress
 import logging
 import os
 import pickle
@@ -54,6 +55,14 @@ def is_hip() -> bool:
     return torch.version.hip is not None
 
 
+def is_ipv6(address):
+    try:
+        ipaddress.IPv6Address(address)
+        return True
+    except ipaddress.AddressValueError:
+        return False
+
+
 def enable_show_time_cost():
     global show_time_cost
     show_time_cost = True