[web_server] Deprecate version 1 (#17109)

esphome/components/web_server/__init__.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import gzip
+import logging
 
 import esphome.codegen as cg
 from esphome.components import web_server_base
@@ -38,6 +39,8 @@ from esphome.core import CORE, CoroPriority, coroutine_with_priority
 import esphome.final_validate as fv
 from esphome.types import ConfigType
 
+_LOGGER = logging.getLogger(__name__)
+
 AUTO_LOAD = ["json", "web_server_base"]
 
 CONF_SORTING_GROUP_ID = "sorting_group_id"
@@ -71,6 +74,15 @@ def default_url(config: ConfigType) -> ConfigType:
     return config
 
 
+def validate_version_deprecated(config: ConfigType) -> ConfigType:
+    if config[CONF_VERSION] == 1:
+        _LOGGER.warning(
+            "Version 1 of 'web_server' is deprecated and will be removed in "
+            "2027.1.0. Please migrate to version 2 (the default) or version 3."
+        )
+    return config
+
+
 def validate_local(config: ConfigType) -> ConfigType:
     if CONF_LOCAL in config and config[CONF_VERSION] == 1:
         raise cv.Invalid("'local' is not supported in version 1")
@@ -220,6 +232,7 @@ CONFIG_SCHEMA = cv.All(
         ]
     ),
     default_url,
+    validate_version_deprecated,
     validate_local,
     validate_sorting_groups,
     validate_ota,