# HG changeset patch
# User Yaroslav Zhuravlev <yar@nginx.com>
# Date 1580749481 0
# Node ID 20dbb29cbe05fbd902f1040b39eea0eeb64f1f42
# Parent  9ceda894f3d7c2318803966341f3813c228597d6
Documented the "Unknown version" error in the API.

diff --git a/xml/en/docs/http/ngx_http_api_module.xml b/xml/en/docs/http/ngx_http_api_module.xml
--- a/xml/en/docs/http/ngx_http_api_module.xml
+++ b/xml/en/docs/http/ngx_http_api_module.xml
@@ -284,6 +284,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns an array of strings</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -311,6 +312,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_object">nginx</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -329,6 +331,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_processes">Processes</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteProcesses">
@@ -339,6 +342,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -366,6 +370,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_connections">Connections</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteConnections">
@@ -376,6 +381,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -403,6 +409,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_slab_zone">Shared memory zone with slab allocator</link>" objects for all slabs</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -437,7 +444,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_slab_zone">Shared memory zone with slab allocator</link></listitem>
-<listitem>404 - Slab not found (<literal>SlabNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Slab not found (<literal>SlabNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteSlabZoneStats">
@@ -448,7 +456,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - Slab not found (<literal>SlabNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Slab not found (<literal>SlabNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -468,6 +477,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns an array of strings</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -495,6 +505,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_http_requests">HTTP Requests</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteHttpRequests">
@@ -505,6 +516,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -533,6 +545,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_http_server_zone">HTTP Server Zone</link>" objects for all HTTP server zones</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -567,7 +580,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_http_server_zone">HTTP Server Zone</link></listitem>
-<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteHttpServerZoneStat">
@@ -578,7 +592,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -607,6 +622,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_http_location_zone">HTTP Location Zone</link>" objects for all HTTP location zones</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -641,7 +657,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_http_location_zone">HTTP Location Zone</link></listitem>
-<listitem>404 - Location zone not found (<literal>LocationZoneNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Location zone not found (<literal>LocationZoneNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteHttpLocationZoneStat">
@@ -652,7 +669,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - Location zone not found (<literal>LocationZoneNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Location zone not found (<literal>LocationZoneNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -681,6 +699,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_http_cache">HTTP Cache</link>" objects for all HTTP caches</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -715,7 +734,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_http_cache">HTTP Cache</link></listitem>
-<listitem>404 - Cache not found (<literal>CacheNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Cache not found (<literal>CacheNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteHttpCacheZoneStat">
@@ -726,7 +746,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - Cache not found (<literal>CacheNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Cache not found (<literal>CacheNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -755,6 +776,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_http_limit_conn_zone">HTTP Connections Limiting</link>" objects for all HTTP limit conns</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -789,7 +811,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_http_limit_conn_zone">HTTP Connections Limiting</link></listitem>
-<listitem>404 - limit_conn not found (<literal>LimitConnNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - limit_conn not found (<literal>LimitConnNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteHttpLimitConnZoneStat">
@@ -800,7 +823,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - limit_conn not found (<literal>LimitConnNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - limit_conn not found (<literal>LimitConnNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -829,6 +853,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_http_limit_req_zone">HTTP Requests Rate Limiting</link>" objects for all HTTP limit reqs</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -863,7 +888,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_http_limit_req_zone">HTTP Requests Rate Limiting</link></listitem>
-<listitem>404 - limit_req not found (<literal>LimitReqNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - limit_req not found (<literal>LimitReqNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteHttpLimitReqZoneStat">
@@ -874,7 +900,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - limit_req not found (<literal>LimitReqNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - limit_req not found (<literal>LimitReqNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -903,6 +930,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_http_upstream">HTTP Upstream</link>" objects for all HTTP upstreams</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -938,7 +966,8 @@ Possible responses:
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_http_upstream">HTTP Upstream</link></listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteHttpUpstreamStat">
@@ -950,7 +979,8 @@ Possible responses:
 <list type="bullet">
 <listitem>204 - Success</listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -978,7 +1008,8 @@ Possible responses:
 <list type="bullet">
 <listitem>200 - Success, returns an array of <link id="def_nginx_http_upstream_conf_server">HTTP Upstream Servers</link></listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="postHttpUpstreamServer">
@@ -1017,7 +1048,8 @@ route is too long (<literal>UpstreamBadR
 no resolver defined to resolve (<literal>UpstreamConfNoResolver</literal>),
 upstream “<value>name</value>” has no backup (<literal>UpstreamNoBackup</literal>),
 upstream “<value>name</value>” memory exhausted (<literal>UpstreamOutOfMemory</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>415 - JSON error (<literal>JsonError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
@@ -1051,8 +1083,9 @@ Possible responses:
 <listitem>200 - Success, returns <link id="def_nginx_http_upstream_conf_server">HTTP Upstream Server</link></listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>),
 invalid server ID (<literal>UpstreamBadServerId</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="patchHttpUpstreamPeer">
@@ -1090,8 +1123,9 @@ route is too long (<literal>UpstreamBadR
 server “<value>ID</value>” address is immutable (<literal>UpstreamServerImmutable</literal>),
 server “<literal>ID</literal>” weight is immutable (<literal>UpstreamServerWeightImmutable</literal>),
 upstream “<literal>name</literal>” memory exhausted (<literal>UpstreamOutOfMemory</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>415 - JSON error (<literal>JsonError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
@@ -1107,8 +1141,9 @@ Possible responses:
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>),
 invalid server ID (<literal>UpstreamBadServerId</literal>),
 server “<value>id</value>” not removable (<literal>UpstreamServerImmutable</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1137,6 +1172,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_http_keyval_zone">HTTP Keyval Shared Memory Zone</link>" objects for all HTTP keyvals</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1172,7 +1208,8 @@ Possible responses:
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_http_keyval_zone">HTTP Keyval Shared Memory Zone</link></listitem>
 <listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
-keyval key not found (<literal>KeyvalKeyNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+keyval key not found (<literal>KeyvalKeyNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="postHttpKeyvalZoneData">
@@ -1198,7 +1235,8 @@ key required (<literal>KeyvalFormatError
 keyval timeout is not enabled (<literal>KeyvalFormatError</literal>),
 only one key can be added (<literal>KeyvalFormatError</literal>),
 reading request body failed <literal>BodyReadError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>409 - Key already exists (<literal>KeyvalKeyExists</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>413 - Request Entity Too Large, returns <link id="def_nginx_error">Error</link></listitem>
@@ -1228,7 +1266,8 @@ keyval timeout is not enabled (<literal>
 only one key can be updated (<literal>KeyvalFormatError</literal>),
 reading request body failed <literal>BodyReadError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
-keyval key not found (<literal>KeyvalKeyNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+keyval key not found (<literal>KeyvalKeyNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>413 - Request Entity Too Large, returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>415 - JSON error (<literal>JsonError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
@@ -1242,7 +1281,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1262,6 +1302,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns an array of strings</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1289,6 +1330,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_stream_server_zone">Stream Server Zone</link>" objects for all stream server zones</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1323,7 +1365,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_stream_server_zone">Stream Server Zone</link></listitem>
-<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteStreamServerZoneStat">
@@ -1334,7 +1377,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server zone not found (<literal>ServerZoneNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1363,6 +1407,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_stream_limit_conn_zone">Stream Connections Limiting</link>" objects for all stream limit conns</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1397,7 +1442,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_stream_limit_conn_zone">Stream Connections Limiting</link></listitem>
-<listitem>404 - limit_conn not found (<literal>LimitConnNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - limit_conn not found (<literal>LimitConnNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteStreamLimitConnZoneStat">
@@ -1408,7 +1454,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - limit_conn not found (<literal>LimitConnNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - limit_conn not found (<literal>LimitConnNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1437,6 +1484,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_stream_upstream">Stream Upstream</link>" objects for all stream upstreams</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1472,7 +1520,8 @@ Possible responses:
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_stream_upstream">Stream Upstream</link></listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteStreamUpstreamStat">
@@ -1484,7 +1533,8 @@ Possible responses:
 <list type="bullet">
 <listitem>204 - Success</listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1512,7 +1562,8 @@ Possible responses:
 <list type="bullet">
 <listitem>200 - Success, returns an array of <link id="def_nginx_stream_upstream_conf_server">Stream Upstream Servers</link></listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="postStreamUpstreamServer">
@@ -1551,7 +1602,8 @@ no resolver defined to resolve (<literal
 upstream “<value>name</value>” has no backup (<literal>UpstreamNoBackup</literal>),
 upstream “<value>name</value>” memory exhausted (<literal>UpstreamOutOfMemory</literal>),
 reading request body failed <literal>BodyReadError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>415 - JSON error (<literal>JsonError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
@@ -1585,7 +1637,8 @@ Possible responses:
 <listitem>200 - Success, returns <link id="def_nginx_stream_upstream_conf_server">Stream Upstream Server</link></listitem>
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>),
 invalid server ID (<literal>UpstreamBadServerId</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>),
 server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1624,8 +1677,9 @@ reading request body failed <literal>Bod
 server “<value>ID</value>” address is immutable (<literal>UpstreamServerImmutable</literal>),
 server “<value>ID</value>” weight is immutable (<literal>UpstreamServerWeightImmutable</literal>),
 upstream “<literal>name</literal>” memory exhausted (<literal>UpstreamOutOfMemory</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>415 - JSON error (<literal>JsonError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
@@ -1641,8 +1695,9 @@ Possible responses:
 <listitem>400 - Upstream is static (<literal>UpstreamStatic</literal>),
 invalid server ID (<literal>UpstreamBadServerId</literal>),
 server “<value>id</value>” not removable (<literal>UpstreamServerImmutable</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Upstream not found (<literal>UpstreamNotFound</literal>),
-server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Server with ID “<value>id</value>” does not exist (<literal>UpstreamServerNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>),
+upstream not found (<literal>UpstreamNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1671,6 +1726,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_stream_keyval_zone">Stream Keyval Shared Memory Zone</link>" objects for all stream keyvals</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1706,7 +1762,8 @@ Possible responses:
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_stream_keyval_zone">Stream Keyval Shared Memory Zone</link></listitem>
 <listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
-keyval key not found (<literal>KeyvalKeyNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+keyval key not found (<literal>KeyvalKeyNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="postStreamKeyvalZoneData">
@@ -1732,7 +1789,8 @@ key required (<literal>KeyvalFormatError
 keyval timeout is not enabled (<literal>KeyvalFormatError</literal>),
 only one key can be added (<literal>KeyvalFormatError</literal>),
 reading request body failed <literal>BodyReadError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
-<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>409 - Key already exists (<literal>KeyvalKeyExists</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>413 - Request Entity Too Large, returns <link id="def_nginx_error">Error</link></listitem>
@@ -1762,7 +1820,8 @@ keyval timeout is not enabled (<literal>
 only one key can be updated (<literal>KeyvalFormatError</literal>),
 reading request body failed <literal>BodyReadError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
-keyval key not found (<literal>KeyvalKeyNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+keyval key not found (<literal>KeyvalKeyNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>413 - Request Entity Too Large, returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>415 - JSON error (<literal>JsonError</literal>), returns <link id="def_nginx_error">Error</link></listitem>
@@ -1776,7 +1835,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Keyval not found (<literal>KeyvalNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1796,6 +1856,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_stream_zone_sync">Stream Zone Sync Node</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1823,6 +1884,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns a collection of "<link id="def_nginx_resolver_zone">Resolver Zone</link>" objects for all resolvers</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
@@ -1857,7 +1919,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_resolver_zone">Resolver Zone</link></listitem>
-<listitem>404 - Resolver zone not found (<literal>ResolverZoneNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Resolver zone not found (<literal>ResolverZoneNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteResolverZoneStat">
@@ -1868,7 +1931,8 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
-<listitem>404 - Resolver zone not found (<literal>ResolverZoneNotFound</literal>), returns <link id="def_nginx_error">Error</link></listitem>
+<listitem>404 - Resolver zone not found (<literal>ResolverZoneNotFound</literal>),
+unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 <listitem>405 - Method disabled (<literal>MethodDisabled</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
@@ -1897,6 +1961,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>200 - Success, returns <link id="def_nginx_ssl_object">SSL</link></listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 <listitem id="deleteSslStat">
@@ -1907,6 +1972,7 @@ Possible responses:
 </para>
 <list type="bullet">
 <listitem>204 - Success</listitem>
+<listitem>404 - Unknown version (<literal>UnknownVersion</literal>), returns <link id="def_nginx_error">Error</link></listitem>
 </list>
 </listitem>
 </list>
diff --git a/yaml/nginx_api.yaml b/yaml/nginx_api.yaml
--- a/yaml/nginx_api.yaml
+++ b/yaml/nginx_api.yaml
@@ -54,6 +54,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/ArrayOfStrings'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   /nginx:
     get:
       tags:
@@ -75,6 +79,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxObject'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   /processes:
     get:
       tags:
@@ -91,6 +99,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxProcesses'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
     delete:
       tags:
         - Processes
@@ -102,6 +114,10 @@ paths:
       responses:
         '204':
           description: Success
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   /connections:
     get:
       tags:
@@ -117,6 +133,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxConnections'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
       parameters:
         - in: query
           name: fields
@@ -133,6 +153,10 @@ paths:
       responses:
         '204':
           description: Success
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   /slabs/:
     get:
       tags:
@@ -156,6 +180,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxSlabZoneMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/slabs/{slabZoneName}':
     parameters:
       - name: slabZoneName
@@ -184,7 +212,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxSlabZone'
         '404':
-          description: Slab not found (*SlabNotFound*)
+          description: |
+            Slab not found (*SlabNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -199,7 +229,9 @@ paths:
         '204':
           description: Success
         '404':
-          description: Slab not found (*SlabNotFound*)
+          description: |
+            Slab not found (*SlabNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -221,6 +253,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/ArrayOfStrings'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   /http/requests:
     get:
       tags:
@@ -242,6 +278,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxHTTPRequests'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
     delete:
       tags:
         - HTTP Requests
@@ -252,6 +292,10 @@ paths:
       responses:
         '204':
           description: Success
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
         '405':
           description: Method disabled (*MethodDisabled*)
           schema:
@@ -279,6 +323,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxHTTPServerZonesMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/http/server_zones/{httpServerZoneName}':
     parameters:
       - name: httpServerZoneName
@@ -306,7 +354,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxHTTPServerZone'
         '404':
-          description: Server zone not found (*ServerZoneNotFound*)
+          description: |
+            Server zone not found (*ServerZoneNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -321,7 +371,9 @@ paths:
         '204':
           description: Success
         '404':
-          description: Server zone not found (*ServerZoneNotFound*)
+          description: |
+            Server zone not found (*ServerZoneNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -351,6 +403,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxHTTPLocationZonesMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/http/location_zones/{httpLocationZoneName}':
     parameters:
       - name: httpLocationZoneName
@@ -379,7 +435,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxHTTPLocationZone'
         '404':
-          description: Location zone not found (*LocationZoneNotFound*)
+          description: |
+            Location zone not found (*LocationZoneNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -394,7 +452,9 @@ paths:
         '204':
           description: Success
         '404':
-          description: Location zone not found (*LocationZoneNotFound*)
+          description: |
+            Location zone not found (*LocationZoneNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -425,6 +485,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxHTTPCachesMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/http/caches/{httpCacheZoneName}':
     parameters:
       - name: httpCacheZoneName
@@ -452,7 +516,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxHTTPCache'
         '404':
-          description: Cache not found (*CacheNotFound*)
+          description: |
+            Cache not found (*CacheNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -466,7 +532,9 @@ paths:
         '204':
           description: Success
         '404':
-          description: Cache not found (*CacheNotFound*)
+          description: |
+            Cache not found (*CacheNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -496,6 +564,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxHTTPLimitConnZonesMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/http/limit_conns/{httpLimitConnZoneName}':
     parameters:
       - name: httpLimitConnZoneName
@@ -527,7 +599,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxHTTPLimitConnZone'
         '404':
-          description: limit_conn not found (*LimitConnNotFound*)
+          description: |
+            limit_conn not found (*LimitConnNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -541,7 +615,9 @@ paths:
         '204':
           description: Success
         '404':
-          description: limit_conn not found (*LimitConnNotFound*)
+          description: |
+            limit_conn not found (*LimitConnNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -571,6 +647,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxHTTPLimitReqZonesMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/http/limit_reqs/{httpLimitReqZoneName}':
     parameters:
       - name: httpLimitReqZoneName
@@ -602,7 +682,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxHTTPLimitReqZone'
         '404':
-          description: limit_req not found (*LimitReqNotFound*)
+          description: |
+            limit_req not found (*LimitReqNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -616,7 +698,9 @@ paths:
         '204':
           description: Success
         '404':
-          description: limit_req not found (*LimitReqNotFound*)
+          description: |
+            limit_req not found (*LimitReqNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -646,6 +730,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxHTTPUpstreamMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/http/upstreams/{httpUpstreamName}/':
     parameters:
     - name: httpUpstreamName
@@ -678,7 +766,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxError'
         '404':
-          description: Upstream not found (*UpstreamNotFound*)
+          description: |
+            Unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -699,7 +789,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxError'
         '404':
-          description: Upstream not found (*UpstreamNotFound*)
+          description: |
+            Unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -733,7 +825,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxError'
         '404':
-          description: Upstream not found (*UpstreamNotFound*)
+          description: |
+            Unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
     post:
@@ -785,7 +879,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxError'
         '404':
-          description: Upstream not found (*UpstreamNotFound*)
+          description: |
+            Unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -831,8 +927,9 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Upstream not found (*UpstreamNotFound*),
-            server with ID “**id**” does not exist (*UpstreamServerNotFound*)
+            Server with ID “**id**” does not exist (*UpstreamServerNotFound*),
+            unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
     patch:
@@ -884,8 +981,9 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Upstream not found (*UpstreamNotFound*),
-            server with ID “**id**” does not exist (*UpstreamServerNotFound*)
+            Server with ID “**id**” does not exist (*UpstreamServerNotFound*),
+            unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -919,8 +1017,9 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Upstream not found (*UpstreamNotFound*),
-            server with ID “**id**” does not exist (*UpstreamServerNotFound*)
+            Server with ID “**id**” does not exist (*UpstreamServerNotFound*),
+            unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -949,6 +1048,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxHTTPKeyvalZonesMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/http/keyvals/{httpKeyvalZoneName}':
     parameters:
       - name: httpKeyvalZoneName
@@ -979,7 +1082,8 @@ paths:
         '404':
           description: |
             Keyval not found (*KeyvalNotFound*),
-            keyval key not found (*KeyvalKeyNotFound*)
+            keyval key not found (*KeyvalKeyNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     post:
@@ -1023,7 +1127,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxError'
         '404':
-          description: Keyval not found (*KeyvalNotFound*)
+          description: |
+            Keyval not found (*KeyvalNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1085,7 +1191,8 @@ paths:
         '404':
           description: |
             Keyval not found (*KeyvalNotFound*),
-            keyval key not found (*KeyvalKeyNotFound*)
+            keyval key not found (*KeyvalKeyNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1116,7 +1223,9 @@ paths:
         '204':
           description: Success
         '404':
-          description: Keyval not found (*KeyvalNotFound*)
+          description: |
+            Keyval not found (*KeyvalNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1137,6 +1246,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/ArrayOfStrings'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   /stream/server_zones/:
     get:
       tags:
@@ -1160,6 +1273,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxStreamServerZonesMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/stream/server_zones/{streamServerZoneName}':
     parameters:
       - name: streamServerZoneName
@@ -1188,7 +1305,8 @@ paths:
             $ref: '#/definitions/NginxStreamServerZone'
         '404':
           description: |
-            Server zone not found (*ServerZoneNotFound*)
+            Server zone not found (*ServerZoneNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -1204,7 +1322,8 @@ paths:
           description: Success
         '404':
           description: |
-            Server zone not found (*ServerZoneNotFound*)
+            Server zone not found (*ServerZoneNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1234,6 +1353,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxStreamLimitConnZonesMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/stream/limit_conns/{streamLimitConnZoneName}':
     parameters:
       - name: streamLimitConnZoneName
@@ -1265,7 +1388,9 @@ paths:
           schema:
             $ref: '#/definitions/NginxStreamLimitConnZone'
         '404':
-          description: limit_conn not found (*LimitConnNotFound*)
+          description: |
+            limit_conn not found (*LimitConnNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -1279,7 +1404,9 @@ paths:
         '204':
           description: Success
         '404':
-          description: limit_conn not found (*LimitConnNotFound*)
+          description: |
+            limit_conn not found (*LimitConnNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1309,6 +1436,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxStreamUpstreamMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/stream/upstreams/{streamUpstreamName}/':
     parameters:
     - name: streamUpstreamName
@@ -1342,7 +1473,8 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Upstream not found (*UpstreamNotFound*)
+            Unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -1364,7 +1496,8 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Upstream not found (*UpstreamNotFound*)
+            Unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1399,7 +1532,8 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Upstream not found (*UpstreamNotFound*)
+            Unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
     post:
@@ -1452,7 +1586,8 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Upstream not found (*UpstreamNotFound*)
+            Unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1498,7 +1633,8 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Upstream not found (*UpstreamNotFound*),
+            Unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*),
             server with ID “**id**” does not exist (*UpstreamServerNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
@@ -1551,8 +1687,9 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Upstream not found (*UpstreamNotFound*),
-            server with ID “**id**” does not exist (*UpstreamServerNotFound*)
+            Server with ID “**id**” does not exist (*UpstreamServerNotFound*),
+            unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1586,8 +1723,9 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Upstream not found (*UpstreamNotFound*),
-            server with ID “**id**” does not exist (*UpstreamServerNotFound*)
+            Server with ID “**id**” does not exist (*UpstreamServerNotFound*),
+            unknown version (*UnknownVersion*),
+            upstream not found (*UpstreamNotFound*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1616,6 +1754,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxStreamKeyvalZonesMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   '/stream/keyvals/{streamKeyvalZoneName}':
     parameters:
       - name: streamKeyvalZoneName
@@ -1646,7 +1788,8 @@ paths:
         '404':
           description: |
             Keyval not found (*KeyvalNotFound*),
-            keyval key not found (*KeyvalKeyNotFound*)
+            keyval key not found (*KeyvalKeyNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     post:
@@ -1691,7 +1834,8 @@ paths:
             $ref: '#/definitions/NginxError'
         '404':
           description: |
-            Keyval not found (*KeyvalNotFound*)
+            Keyval not found (*KeyvalNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1753,7 +1897,8 @@ paths:
         '404':
           description: |
             Keyval not found (*KeyvalNotFound*),
-            keyval key not found (*KeyvalKeyNotFound*)
+            keyval key not found (*KeyvalKeyNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1785,7 +1930,8 @@ paths:
           description: Success
         '404':
           description: |
-            Keyval not found (*KeyvalNotFound*)
+            Keyval not found (*KeyvalNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1807,6 +1953,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxStreamZoneSync'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
   /resolvers/:
     get:
       tags:
@@ -1823,6 +1973,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxResolverZonesMap'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
       parameters:
         - in: query
           name: fields
@@ -1858,7 +2012,8 @@ paths:
             $ref: '#/definitions/NginxResolverZone'
         '404':
           description: |
-            Resolver zone not found (*ResolverZoneNotFound*)
+            Resolver zone not found (*ResolverZoneNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
     delete:
@@ -1872,7 +2027,9 @@ paths:
         '204':
           description: Success
         '404':
-          description: Resolver zone not found (*ResolverZoneNotFound*)
+          description: |
+            Resolver zone not found (*ResolverZoneNotFound*),
+            unknown version (*UnknownVersion*)
           schema:
             $ref: '#/definitions/NginxError'
         '405':
@@ -1894,6 +2051,10 @@ paths:
           description: Success
           schema:
             $ref: '#/definitions/NginxSSLObject'
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
       parameters:
         - in: query
           name: fields
@@ -1909,6 +2070,10 @@ paths:
       responses:
         '204':
           description: Success
+        '404':
+          description: Unknown version (*UnknownVersion*)
+          schema:
+            $ref: '#/definitions/NginxError'
 ###
 ###DEFINITIONS
 ###